Zone 143, Master Map
Normal View
+24°00'
Zone Master, Normal View, 10 deg FOV
c
+22°00'
e
+18°00'
+20°00'
M64
Muphridη
f
d
α
+16°00'
τ
M53
υ
Coma Berenices
14h 00m
13h 52m
13h 44m
Virgo
13h 36m
13h 28m
13h 20m
13h 12m
13h 04m
12h 56m
Zone 143, Map 1
Normal Image
+25°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
+24°00'
OS 268
H V 70
OS 259 rej
STF 1714
+23°00'
Couteau 2708
+22°00'
NGC 5012
STF 1748
+21°00'
Couteau 54
Couteau 96
Bergh
13h 30m
13h 25m
13h 20m
13h 15m
13h 10m
13h 05m
13h 00m
Zone 143, Map 1
Mirror Image
+24°00'
+25°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
OS 259 rej
STF 1714
+23°00'
Couteau 2708
STF 1748
+22°00'
NGC 5012
+21°00'
Couteau 54
Couteau 96
13h 00m
13h 05m
13h 10m
13h 15m
Bergh
13h 20m
13h 25m
13h 30m
Zone 143, Map 2
Normal Image
+20°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
Bergh
+19°00'
STF 1715
+18°00'
Bur 112
M53
NGC 5024
South 648
STF 1737
NGC 5053
α
Alpha Com
+17°00'
STF 1733
Bur 800
STF 1707
OS 266
Fox 177
h223
STF 1722
h220
13h 30m
13h 25m
13h 20m
13h 15m
13h 10m
13h 05m
13h 00m
+16°00'
NGC 5180
Zone 143, Map 2
Mirror Image
+20°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
Bergh
+19°00'
STF 1715
+18°00'
Bur 112
M53
NGC 5024
South 648
STF 1737
NGC 5053
α
+17°00'
Alpha Com
STF 1733
Bur 800
+16°00'
NGC 5180
STF 1707
Fox 177
OS 266
h223
STF 1722
h220
13h 00m
13h 05m
13h 10m
13h 15m
13h 20m
13h 25m
13h 30m
Zone 143, Map 3
Normal Image
OS 268
H V 70
+24°00'
+25°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
h2688
STF 1779
+23°00'
Pourteau 3145
STF 1756
+22°00'
Pourteau 3143
+21°00'
6 Boo
1 Boo
STF 1794
14h 00m
13h 55m
13h 50m
13h 45m
13h 40m
h2663
13h 35m
13h 30m
Zone 143, Map 3
Mirror Image
+25°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
+24°00'
OS 268
H V 70
h2688
STF 1779
+23°00'
Pourteau 3145
STF 1756
+22°00'
Pourteau 3143
STF 1748
h2663
13h 30m
13h 35m
+21°00'
6 Boo
1 Boo
13h 40m
13h 45m
13h 50m
13h 55m
14h 00m
Zone 143, Map 4
Normal Image
1 Boo
h2663
+19°00'
STF 1794
+20°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
Muphrid
STF 1782
+18°00'
Eta Booη
h230
South 655
Tau Boo
+16°00'
+17°00'
τ
υ
14h 00m
13h 55m
13h 50m
Upsilon Boo
13h 45m
13h 40m
13h 35m
13h 30m
Zone 143, Map 4
Mirror Image
h2663
+20°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
+19°00'
1 Boo
η
Eta Boo
Muphrid
+18°00'
STF 1782
h230
South 655
+16°00'
+17°00'
Tau Boo τ
Upsilon Boo υ
13h 30m
13h 35m
13h 40m
13h 45m
13h 50m
13h 55m
14h 00m
Zone 143
1 Reference Star, 34 Double Stars,
2 Globular Clusters, 2 Galaxies
Flamsteed
N
1 Boo.................................................... 18
6 Boo.................................................... 15
NGC 5012 .............................................. 5
NGC 5024 ............................................ 12
NGC 5053 ............................................ 13
NGC 5180 ............................................ 13
A
Alpha Com............................................. 7
O
B
OS 259 rej .............................................. 2
OS 266 ................................................. 11
Bergh 46 .............................................. 10
Bur 112 .................................................. 6
Bur 800 .................................................. 9
P
Pourteau 3143 ...................................... 15
Pourteau 3145 ...................................... 16
C
Couteau 2708......................................... 3
Couteau 54............................................. 3
Couteau 96............................................. 4
S
South 648 ............................................... 8
South 655 ............................................. 19
STF 1707................................................ 6
STF 1714................................................ 2
STF 1715................................................ 7
STF 1722.............................................. 10
STF 1733................................................ 8
STF 1737................................................ 5
STF 1748................................................ 4
STF 1756.............................................. 14
STF 1779.............................................. 14
STF 1782.............................................. 17
E
Eta Boo ................................................ 20
F
Fox 177 .................................................. 9
H
H V 70 ................................................. 17
h223 ..................................................... 11
h230 ..................................................... 19
h2663 ................................................... 18
h2688 ................................................... 16
T
Tau Boo................................................ 21
-1-
Zone 143
Zone 143, Map 1
Double Stars
Easy
STF 1714
Rating: 3 E
ADS 8758
Position: 1304+2339
A
B
Magnitude
9.50
9.59
Separation PA
—
—
3.1 +
307 -
Year
—
1998
Spectra
F8
Colors
W
W
Notes:
1832: 3.0 @ 311. 28 measurements.
Observations:
C11 at 193x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 16.3 inches.
Separation: AB = 3.19 miles.
Distance (LY): 660
Total luminosity (Suns): 10.4
OS 259 rej
Rating: 3 E
HD 114060; SAO 82662
Position: 1308+2401
A
B
Magnitude
8.15
8.55
Separation PA
—
—
39.1 21 =
Year
—
1991
Notes:
1843: 39.6 @ 21. 24 measurements.
The stars share a very large common proper motion.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 3.00 inches; B = 17.5 inches.
Separation: AB = 7.26 miles.
Distance (LY): 119
Total luminosity (Suns): 1.0
-2-
Spectra
G5 V
G0
Colors
Zone 143
Couteau 2708
Rating: 4 E
SAO 82668
Position: 1308+2325
A
B
Magnitude
10.11
11.00
Separation PA
—
—
4.1 +
78 -
Year
—
1999
Spectra
G5
Colors
Y
W?
Notes:
1965: 3.8 @ 80. 3 measurements.
Observations:
C11 at 193x.
Couteau 54
Rating: 5 E
HD 114637; SAO 82699
Position: 1312+2155
A
B
Magnitude
6.82
10.40
Separation PA
—
—
10.3 291 +
Year
—
1965
Notes:
1893: 10.6 @288. 2 measurements.
Observations:
C8 at 206x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 39.0 inches.
Separation: AB = 8.51 miles.
Distance (LY): 530
Total luminosity (Suns): 42
-3-
Spectra
G5 III
Colors
Y
?
Zone 143
Moderate
STF 1748
Rating: 3 M
ADS 8918; HD 117318; SAO 82862
Position: 1329+2211
A
B
C
Magnitude
8.10
11.02
10.80
Separation
—
6.0 +
150.1
PA
—
183 +
353
Year
—
1991
1911
Spectra
F8
Colors
W
O?
W
Notes:
AB 1832: 5.5 @ 180. 17 measurements.
AC 1 measurement.
Observations:
C8 at 104x.
Couteau 96
Rating: 5 M
HD 114520; SAO 82692
Position: 1311+2114
A
B
C
Magnitude
6.82
10.69
12.20
Separation
—
10.9 =
84.5
PA
—
311 6
Year
—
1998
1989
Notes:
AB 1893: 10.9 @ 316. 5 measurements.
AC 1 measurement.
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 6 feet 9 inches.
Separation: AB = 7.05 miles; AC = 54.7 miles.
Distance (LY): 415
Total luminosity (Suns): 27
-4-
Spectra
F2 II
Colors
bW
?
No
Zone 143
Deep Sky Objects
Difficult
NGC 5012
Other Names: UGC 8270
Astronomical League Program: Herschel II Club
Rating: 4 D
Position: 1312+2255
Type: Gal
Surface brightness: 13.6
Class: SAAB(rs)c II
Dimensions: 2,7' x 1.6'
Magnitude: 12.2
PA: 10
Observations:
C11 at 193x. Uniform, sizeable blob, confirmed with tube movement; then it was
easy. N/S axis (about 2 x 1 ratio).
Distance (LY): 110,000,000
Radial velocity (k/s): +2,619
Total luminosity (Suns): 12,500,000,000
Zone 143, Map 2
Double Stars
Easy
STF 1737
Rating: 3 E
ADS 8871; HD 116206; SAO 100534; H IV 57
Position: 1322+1746
A
B
Magnitude
7.82
10.46
Separation PA
—
—
15.1 =
219 -
Year
—
1992
Spectra
F0
Colors
W
dB
Notes:
1829: 15.1 @ 221. 16 measurements. The stars share common proper motion.
-5-
Zone 143
Observations:
C8 at 104x.
STF 1707
Rating: 4 E
ADS 8740; HD 113097; SAO 100376
Position: 1301+1552
A
B
Magnitude
9.59
10.96
Separation PA
—
—
8.6 38 +
Year
—
1976
Spectra
G0
Colors
Y
rO?
Notes:
1828: 10.2 @ 31. 19 measurements.
Observations:
C11 at 98x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 18.5 inches.
Separation: AB = 1.20 miles.
Distance (LY): 90
Total luminosity (Suns): 0.119
Bur 112
Rating: 4 E
ADS 8735; HD 113022; SAO 100366
Position: 1301+1822
A
B
Magnitude
6.22
9.58
Separation PA
—
—
146.8 352 +
Notes:
1875: 153.4 @ 347. 11 measurements.
This star is a member of the Hyades group.
Observations:
C8 at 104x.
-6-
Year
—
1926
Spectra
F5 V
Colors
W
pB
Zone 143
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 4.35 inches.
Separation: AB = 30.5 miles.
Distance (LY): 133
Total luminosity (Suns): 5.3
STF 1715
Rating: 4 E
ADS 8761; HD 113527
Position: 1304+1924
A
B
Magnitude
9.45
10.24
Separation PA
—
—
7.2 +
231 +
Year
—
1992
Spectra
F8
Colors
W
W
Notes:
1831: 6.8 @ 230. 25 measurements.
Observations:
C11 at 98x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 16.3 inches.
Separation: AB = 4.04 miles.
Distance (LY): 360
Total luminosity (Suns): 2.49
Alpha Com
Rating: 4 E
42 Com; Diadem; STF 1728; ADS 8804; HD 114378; SAO 100443
Position: 1310+1731
A
B
C
Magnitude
5.10
5.10
10.10
Separation
—
0.3 90.2 -!
PA
—
14 -!?
344 +
Year
—
1997
1991
Spectra
F5 V
F5 V
Colors
W
No
W
Notes:
AB 1827: 0.6 @ 190. Over 100 measurements. It has an orbital period of 25.87
years (Haffner, 1948) with an edge-on plane. They were last a periastron in 1981 and
will be again in 2007.
AC 1851: 135.6 @ 322. 7 measurements.
-7-
Zone 143
Observations:
C8 at 104x.
South 648
Rating: 4 E
HD 114864; SAO 100466
Position: 1314+1802
A
B
Magnitude
9.20
9.90
Separation PA
—
—
86.8 67 +
Year
—
1919
Spectra
K0
F5
Colors
O!
W
Notes:
1825: 87.3 @ 66. 5 measurements. The stars have different proper motions.
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 26.1 inches; B = 14.5 inches.
Separation: AB = 9.88 miles.
Distance (LY): 73
Total luminosity (Suns): 0.14
STF 1733
Rating: 4 E
ADS 8840; HD 115320; SAO 100486; H II 46
Position: 1316+1715
A
B
Magnitude
8.66
10.13
Separation PA
—
—
5.1 +
129 +
Year
—
1994
Notes:
1827: 4.6 @ 125. 35 measurements.
Observations:
C11 at 98x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 17.6 inches.
Separation: AB = 3.92 miles.
Distance (LY): 493
Total luminosity (Suns): 8.22
-8-
Spectra
G0
Colors
W
O
Zone 143
Bur 800
Rating: 4 E
ADS 8841; HD 115404; SAO 100491
Position: 1317+1701
A
B
C
D
Magnitude
6.49
9.57
12.45
10.60
Separation
—
7.0 +!
116.2 +!
50.8
PA
—
104 342 88
Year
—
1994
1990
1990
Spectra
K0 V
Colors
yO!
R!
W
No
Notes:
AB 1881: 1.3 @ 122. Over 100 measurements. The AB pair shares a large common
proper motion.
AC 1909: 89.5 @ 9. 4 measurements.
AD 1 measurement.
Observations:
C8 at 206x.
Fox 177
Position: 1322+1542
A
B
Magnitude
10.35
10.50
Rating: 4 E
Separation PA
—
—
17.2 +
87 =
Notes:
1897: 17 @ 87. 7 measurements.
Observations:
C11 at 98x.
-9-
Year
—
1991
Spectra
K5
K5
Colors
O
O
Zone 143
Moderate
STF 1722
Rating: 3 M
ADS 8796; HD 114131; SAO 100432
Position: 1309+1529
A
B
Magnitude
7.83
8.67
Separation PA
—
—
2.7 337 -
Year
—
1997
Spectra
K0 IV
Colors
Y
Y
Notes:
1829: 3.6 @ 344. 86 measurements.
Observations:
C8 at 206x. Webb saw them as Y and B.
Bergh 46
Rating: 4 M
HD 115365; SAO 82751
Position: 1316+1947
A
B
Magnitude
6.43
8.00
Separation PA
—
—
3
58
Year
—
Notes:
The primary spins at 161 kps.
Observations:
C8 at 280x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 5.70 inches; B = 7.10 inches.
Separation: AB = 1.31 miles.
Distance (LY): 280
Total luminosity (Suns): 18.7
- 10 -
Spectra
F0 V
A2
Colors
W
?
Zone 143
OS 266
Rating: 4 M
ADS 8914; HD 117190; SAO 100583
Position: 1328+1543
A
B
Magnitude
7.37
8.51
Separation PA
—
—
1.9 +
355 +
Year
—
1997
Spectra
F5
Colors
W
W
Notes:
1843: 1.0 @ 328. Over 100 measurements.
Observations:
C8 at 206x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 12.5 inches.
Separation: AB = 2,798 feet.
Distance (LY): 181
Total luminosity (Suns): 3.5
h223
Rating: 5 M
HD 115942; SAO 100516
Position: 1320+1534
A
B
Magnitude
7.25
11.00
Separation PA
—
—
36.9 +
3+
Year
—
1998
Notes:
1900: 36.5 @ 347. 3 measurements.
Observations:
C8 at 83x. I had to use averted vision to see B.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 18.5 inches.
Separation: AB = 31.7 miles.
Distance (LY): 550
Total luminosity (Suns): 33
- 11 -
Spectra
G5
Colors
Y
?
Zone 143
Deep Sky Objects
Easy
NGC 5024
Other Names: M53
Astronomical Leage Program: Messier Club
Rating: 2 E
Position: 1313+1810
Type: Gc
Dimensions: 10'
Class: 5
Magnitude: 8.0
Cluster population: 200,000
Notes:
It was discovered by J. Bode on February 3, 1775; Messier cataloged it on February
26, 1777. William Herschel resolved it.
The brightest stars are 13.8m and the horizontal branch is 16.9m.
It is 220 light years in diameter.
Observations:
C8 at 206x. Mottled at high powers,
bright middle. William Herschel said it
was "one of the most beautiful sights I
remember to have seen in the heavens."
Two faint stars– 9.0m SAO 100466 and
9.2m SAO 100468– lie 9 min SE.
Model (where the Sun is a baseball):
Its diameter would be 61,000 miles.
Its stars would be 525 miles apart
Distance (LY): 65,000
Luminosity (suns): 210,000
Radial velocity (km/sec): -112
NGC 5024 (M53)
Globular cluster (5)
Observed with C8 on 7/5/92
Magnification: 80x
- 12 -
Zone 143
Difficult
NGC 5053
Other Names: Collinder 267; H VI 7
Astronomical League Program: Herschel II Club
Rating: 5 D
Position: 1316+1742
Type: Gc
Dimensions: 8'
Class: 11
Cluster population: 3,400
Magnitude: 10.5
Notes:
It was discovered on March 14, 1784 by William Herschel.
The brightest stars are 14.0m and the horizontal branch is 16.6m. It is 100 light years
in diameter and dimmed 1.5 magnitudes by dust.
It might be mistaken for a rich open cluster except the RR Lyrae stars in it give it
away as a globular. It is about 150 light years in diameter.
Observations:
C8 at 83x. Extremely faint, it needs averted vision. It was only semi- resolved.
Model (where the Sun is a baseball):
Its diameter would be 37,000 miles with its stars 1,230 miles apart.
Distance (LY): 49,500
Radial velocity (km/sec): +44
Luminosity (suns): 12,000
NGC 5180
Other Names: UGC 8479; H III 71
Rating: 5 D
Position: 1329+1650
Type: Gal
Surface brightness: 13.2
Class: S0
Dimensions: 1.4' x 1'
Magnitude: 13.0
PA: 25
Observations:
C11 at 140x. Stellar nucleus and very small halo. A 9m star is 5 min ENE.
- 13 -
Zone 143
Zone 143, Map 3
Double Stars
Easy
STF 1756
Rating: 3 E
ADS 8941; SAO 82877
Position: 1334+2301
A
B
Magnitude
9.87
10.36
Separation PA
—
—
14.7 +
177 =
Year
—
1992
Spectra
G5
Colors
O!
B!
Notes:
1831: 14.2 @ 177. 27 measurements. The stars share common proper motion.
Observations:
C8 at 83x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 21.5 inches.
Separation: AB = 5.11 miles.
Distance (LY): 223
Total luminosity (Suns): 0.8
STF 1779
Rating: 3 E
ADS 9007; HD 119731; SAO 82879
Position: 1345+2340
A
B
Magnitude
8.96
10.33
Separation PA
—
—
3.9 +
146 -
Notes:
1832: 3.8 @ 147. 21 measurements.
Observations:
C11 at 115x.
- 14 -
Year
—
1993
Spectra
A5
Colors
W
yO?
Zone 143
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 8.61 inches.
Separation: AB = 11.3 miles.
Distance (LY): 1,860
Total luminosity (Suns): 91
6 Boo
South 656; OSS 126; HD 120651; SAO 83022; H VI 15
Position: 1350+2117
A
B
Magnitude
6.82
7.29
Separation PA
—
—
85.5 209 +
Year
—
1993
Rating: 3 E
Spectra
G0 III
G0
Colors
O
W
Notes:
1825: 85.8 @ 208. 29 measurements. The primary is an infra-red source. The stars
share common proper motion.
Observations:
C8 at 83x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 32.4 inches; B = 16.1 inches.
Separation: AB = 45.1 miles.
Distance (LY): 338
Total luminosity (Suns): 28
Pourteau 3143
Position: 1333+2242
A
B
Magnitude
10.16
12.60
Rating: 4 E
Separation PA
—
—
13.1 +
157 -
Notes:
1892: 13.0 @ 158. 2 measurements.
Observations:
C11 at 115x.
- 15 -
Year
—
1902
Spectra
Colors
W
?
Zone 143
Distance (LY): 50
Total luminosity (Suns): 0.019
h2688
Rating: 4 E
HD 120751; SAO 83032
Position: 1351+2347
A
B
Magnitude
9.78
11.33
Separation PA
—
—
28.8 +
291 +
Year
—
1991
Spectra
K2
Colors
W
dB
Notes:
1879: 22.7 @ 279. 8 measurements.
Observations:
C8 at 83x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 29.7 inches.
Separation: AB = 7.01 miles.
Distance (LY): 156
Total luminosity (Suns): 0.3
Moderate
Pourteau 3145
Position: 1337+2319
A
B
Magnitude
9.80
10.02
Rating: 3 M
Separation PA
—
—
5.7 +
200 -?
Year
—
1970
Spectra
F8
Colors
W
W
Notes:
1892: 5.6 @ 21. 12 measurements. Quadrant reversal?
The stars share common proper motion. However, Hipparcos shows different
distances (1,160 and 113 light years).
- 16 -
Zone 143
H V 70
FK Com; OS 268 rej (B); ADS 8929; HD 117567; SAO 82868
Position: 1331+2414
A
B
C
D
Magnitude
7.61
12.62
8.15
13.56
Separation
—
19.1 75.0 +!
84.6
PA
—
75 257 30
Year
—
1930
1995
1908
Rating: 5 M
Spectra
G2 III
Colors
Y
No
W
?
Notes:
AB 1878: 19.6 @ 77. 5 measurements.
AC 1783: 56.9 @ 263. 41 measurements. May be optical as Hipparcos shows
different distances for A and C (213 and 760 light years).
AD 1 measurement.
Observations:
C8 at 104x. Star B is extremely difficult.
C11 at 115x. B was never detected.
Zone 143, Map 4
Double Stars
Easy
STF 1782
Rating: 3 E
HD 119823; SAO 100688
Position: 1345+1822
A
B
Magnitude
7.98
9.81
Separation PA
—
—
30.1 +
186 =
- 17 -
Year
—
1991
Spectra
F5
Colors
W
B
Zone 143
Notes:
1828: 29.8 @ 186. 17 measurements. Hipparcos/Tycho data show different
distances for these stars; they may be optical. However, the stars show similar proper
motion.
Observations:
C8 at 83x. Star B is difficult to see, due mostly to its color.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 13.0 inches.
Separation: AB = 14.2 miles.
Distance (LY): 302
Total luminosity (Suns): 6
h2663
Rating: 4 E
HD 118389; SAO 82896
Position: 1336+2000
A
B
Magnitude
8.73
10.42
Separation PA
—
—
50.3 149 +
Year
—
1991
Spectra
K5
Colors
Y!
W?
Notes:
1893: 53.0 @ 146. 8 measurements.
Hipparcos/Tycho mission data show different distances for these stars (1,360 and 150
light years); they may be optical. The stars have different proper motions.
1 Boo
STF 1772; ADS 8991; HD 119055; SAO 82942
Position: 1341+1957
A
B
Magnitude
5.73
9.55
Separation PA
—
—
4.5 135 -
Rating: 4 E
Year
—
1997
Spectra
A1 V
F8 V
Colors
W
?
Notes:
1831: 4.8 @ 149. 83 measurements. The stars share common proper motion.
Observations:
C8 at 206x. A diffraction mask helps.
- 18 -
Zone 143
Some observers report both as B. Webb sees bW and V.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 8.70 inches; B = 16.4 inches.
Separation: AB = 2.12 miles.
Distance (LY): 303
Total luminosity (Suns): 37
h230
Position: 1342+1807
A
B
Magnitude
9.28
9.83
Rating: 4 E
Separation PA
—
—
61.4 +
318 +
Year
—
1959
Spectra
K0
Colors
O
Y
Notes:
1895: 58.3 @ 316. 5 measurements.
Observations:
C11 at 98x.
South 655
Rating: 4 E
SAO 100723
Position: 1349+1742
A
B
C
Magnitude
8.96
9.98
12.50
Separation
—
44.7 +
61.9
PA
—
85 +
5
Year
—
1991
1911
Spectra
K2
Colors
Y
W
?
Notes:
AB 1825: 35.0 @ 76. 13 measurements. Hipparcos/Tycho data show different
distances for these stars; they may be optical. The stars have different proper motions.
AC 1 measurement.
Observations:
C8 at 104x. Star C is very difficult.
- 19 -
Zone 143
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 28.4 inches.
Separation: AB = 30.8 miles; AC = 42.7 miles.
Distance (LY): 442
Total luminosity (Suns): 5.652
Eta Boo
Rating: 4 E
8 Boo; Muphrid, "solitary star of the lancer", Achird; Sh 169; HD 121370; SAO
100766
Position: 1355+1824
A
B
Magnitude
2.68
8.80
Separation PA
—
—
110.1 89 -
Year
—
1992
Spectra
G0 IV
Colors
gY
B
Notes:
1822: 126.2 @ 120. 17 measurements.
Star A is a spectroscopic binary with a period of 494.173 days and is also an infra-red
source.
The stars have different proper motions.
From James Kaler's Star Notes:
The name is mystifyingly obscure. It came originally from a name for Arcturus that
referred to a "lance bearer," and that was later applied to other stars in the neighborhood,
and by other people to Eta Bootis "alone," which in Arabic is something close to the
name "Muphrid." So the name actually refers not to a property of the star or to its
location, but in circular fashion to another name!
The star itself is of considerable interest. Though a class G star with a color and
temperature (6,100 Kelvin) near that of the Sun, it is classed as a "subgiant," meaning
that it has started to evolve. It has a radius 2.7 times solar. With a mass about 1.5 times
solar, Muphrid has just ceased core hydrogen fusion. Its quiet helium core surrounded by
a shell of fusing hydrogen, the star is just beginning to make the transition to becoming a
red giant. Muphrid is also double, its spectrum revealing a close companion (possibly a
dead white dwarf) with an orbital period of 1.35 years, the two separated by about the
distance between Mars and the Sun. Muphrid also has a visible "companion," a ninth
magnitude star two minutes of arc away, easily seen in small telescope. The
"companion," however, is merely a line of sight coincidence.
The odd thing is that absolutely nothing is known about it the star, rather strange for
one that bright. Most interesting, Muphrid is one of a somewhat unusual breed of "super
metal rich" stars. "Metal" to an astronomer means "everything else" other than hydrogen
and helium. Muphrid has a metal abundance about twice solar. It is surrounded by a hot
- 20 -
Zone 143
X-ray emitting corona with a temperature of 3.5 million Kelvin, nearly twice as hot as the
solar corona.
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 8.55 inches.
Separation: AB = 6.35 miles.
Distance (LY): 37
Total luminosity (Suns): 9
Difficult
Tau Boo
4 Boo; OS 270; ADS 9025; HD 120136; SAO 100706
Position: 1347+1728
A
B
Magnitude
4.50
11.50
Separation PA
—
—
3.4 -!! 21 +!!
Year
—
1991
Rating: 5 D
Spectra
F7 V
M2
Colors
Y
?
Notes:
1849: 10.1 @ 349. 46 measurements. The orbit takes at least several centuries. The
primary might be a Delta Sct variable.
Observations:
C8 at 206x. Webb saw them as gW and W.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 3.90 inches; B = 53.4 inches.
Separation: AB = 1,526 feet.
Distance (LY): 51
Total luminosity (Suns): 3.245
- 21 -
Zone 143
Zone 143 Mini-Catalog
Double Stars
Designation
Position
Rating
Map
STF 1714
1304+2339
3E
1
OS 259 rej
1308+2401
3E
1
STF 1737
1322+1746
3E
2
STF 1756
1334+2301
3E
3
STF 1782
1345+1822
3E
4
STF 1779
1345+2340
3E
3
6 Boo
1350+2117
3E
3
Bur 112
1301+1822
4E
2
STF 1707
1301+1552
4E
2
STF 1715
1304+1924
4E
2
Couteau 2708
1308+2325
4E
1
Alpha Com
1310+1731
4E
2
South 648
1314+1802
4E
2
STF 1733
1316+1715
4E
2
Bur 800
1317+1701
4E
2
Fox 177
1322+1542
4E
2
Pourteau 3143
1333+2242
4E
3
h2663
1336+2000
4E
4
1 Boo
1341+1957
4E
4
h230
1342+1807
4E
4
South 655
1349+1742
4E
4
h2688
1351+2347
4E
3
Component
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
C
A
B
A
B
A
B
C
D
A
B
A
B
A
B
A
B
A
B
A
B
C
A
B
- 22 -
Mag
9.50
9.59
8.15
8.55
7.82
10.46
9.87
10.36
7.98
9.81
8.96
10.33
6.82
7.29
6.22
9.58
9.59
10.96
9.45
10.24
10.11
11.00
5.10
5.10
10.10
9.20
9.90
8.66
10.13
6.49
9.57
12.45
10.60
10.35
10.50
10.16
12.60
8.73
10.42
5.73
9.55
9.28
9.83
8.96
9.98
12.50
9.78
11.33
Separation
—
3.1 +
—
39.1 —
15.1 =
—
14.7 +
—
30.1 +
—
3.9 +
—
85.5 —
146.8 —
8.6 —
7.2 +
—
4.1 +
—
0.3 90.2 -!
—
86.8 —
5.1 +
—
7.0 +!
116.2 +!
50.8
—
17.2 +
—
13.1 +
—
50.3 —
4.5 —
61.4 +
—
44.7 +
61.9
—
28.8 +
PA
—
307 —
21 =
—
219 —
177 =
—
186 =
—
146 —
209 +
—
352 +
—
38 +
—
231 +
—
78 —
14 -!?
90.2 -!
—
67 +
—
129 +
—
104 116.2 +!
50.8
—
87 =
—
157 —
149 +
—
135 —
318 +
—
85 +
61.9
—
291 +
Zone 143
Designation
Position
Rating
Map
Eta Boo
1355+1824
4E
4
Couteau 54
1312+2155
5E
1
STF 1722
1309+1529
3M
2
STF 1748
1329+2211
3M
1
Pourteau 3145
1337+2319
3M
3
Bergh 46
1316+1947
4M
2
OS 266
1328+1543
4M
2
Couteau 96
1311+2114
5M
1
h223
1320+1534
5M
2
H V 70
1331+2414
5M
3
Tau Boo
1347+1728
5D
4
Component
A
B
A
B
A
B
A
B
C
A
B
A
B
A
B
A
B
C
A
B
A
B
C
D
A
B
Mag
2.68
8.80
6.82
10.40
7.83
8.67
8.10
11.02
10.80
9.80
10.02
6.43
8.00
7.37
8.51
6.82
10.69
12.20
7.25
11.00
7.61
12.62
8.15
13.56
4.50
11.50
Separation
—
110.1 —
10.3 —
2.7 —
6.0 +
150.1
—
5.7 +
—
3
—
1.9 +
—
10.9 =
84.5
—
36.9 +
—
19.1 75.0 +!
84.6
—
3.4 -!!
PA
—
89 —
291 +
—
337 —
183 +
150.1
—
200 -?
—
58
—
355 +
—
311 84.5
—
3+
—
75 75.0 +!
84.6
—
21 +!!
Deep Sky Objects
Object
NGC 5024
NGC 5012
NGC 5053
NGC 5180
Position
1313+1810
1312+2255
1316+1742
1329+1650
Rating
2E
4D
5D
5D
Map
2
1
2
2
Type
Gc (5)
Gal (SAAB(rs)c II)
Gc (11)
Gal (S0)
- 23 -
Specifications
Surface
Mag
Br
8.0
12.2
13.6
10.5
13.0
13.2
Population
200,000
3,400