33 Doubles in Ursa Minoris, and Crux

In this table you can see all the relevant data about the 33 doubles. Click on the name of a star in order to read the observations. Our time "window" for observing this set of doubles is from 1st May, 2004 to 30th, June, 2004.

New: scroll down to read reports from
Northern members when travelling to Southern skies
- If you are a Skymap user, only click here for downloading a file containing all the doubles for this project!
- If you're not, just click here for obtaining a map for both projects
- For Skytools users, just click here to get the file

Name
Distance
Mv1
Mv2
PA
RA(J2000)
Dec(J2000)
Ursa Minoris








Alpha (Polaris)
17.8"
2.10
9.10
216°
02h 31m 49s
+89° 15' 51"
11767
n/a
Struve 1583
11.3"
8.07
9.45
284°
12h 00m 11s
+86° 59' 40"
58531
n/a
Burnham 799
1.1"
6.63
8.52
239°
13h 04m 50s
+73° 01' 30"
63822
94.74
Struve 1771
1.7"
8.82
9.50
80°
13h 36m 42s
+69° 46' 36"
66388
74.63
Hershel 2682
25.3"-48.1"
6.70
9.70-9.00
281°-317°
13h 40m 41s
+76° 50' 37"
66728
n/a
Struve 1798
7.5"
7.47
9.70
12°
13h 55m 02s
+78° 23' 59"
67959
44.75
Struve 1840
27.7"
6.98
10.38
222°
14h 19m 55s
+67° 46' 57"
70041
n/a
Struve 1915
2.4"
7.36
 9.86
319°
14h 33m 18s
+85° 56' 18"
71161
93.83
Hussey 908
1.4"
6.82
 8.94
242°
14h 53m 03s
+78° 10' 36"
72819
91.85
Struve 1905
2.9"
8.31
8.42
161°
14h 56m 48s
+70° 49' 59"
73135
54.49
Struve 1928
6.5"
9.56
10.24
275°
15h 09m 17s
+72° 27' 16"
---
n/a
Struve 3125
2.1"
9.89
10.42
268°
15h 25m 29s
+67° 03' 11
---
n/a
Pi1 (Struve 1972)
31.8"
6.57
7.30
79°
15h 29m 11s
+80° 26' 55"
75809
n/a
Struve 1980
9.7"
9.80
10.30
49°
15h 32m 27s
+81° 03' 10"
---
n/a
Struve 2034
1.2"
7.73
 7.99
112°
15h 48m 43s
+83° 37' 10"
77448
75.96
Kustner 1
2.6"
5.99
10.07
178°
16h 43m 06s
+77° 30' 48"
81854
n/a
Crux








Cordoba 133
8.2"
9.10
9.50
21°
11h 59m 14s
-62° 46' 37"
58456
18.51
Dunlop 117
22.8"
7.40
7.57
149°
12h 04m 47s
-61° 59' 48"
58906
n/a
Hershel 4501
44.0"
4.15
11.80
299°
12h 06m 53s
-64° 36' 49"
59072
n/a
Hershel 4516
21.9"
8.13
9.42
93°
12h 23m 51s
-63° 59' 11"
60472
n/a
Cordoba 137
9.9"
8.80
10.00
344°
12h 24m 15s
-62° 07' 36"
---
28.33
Brisbane 8
5.3"
7.11
7.28
335°
12h 24m 49s
-58° 07' 11"
60557
34.99
Alpha
4.0"
0.77
1.16
114°
12h 26m 36s
-63° 05' 57"
60718
40.65
Hershel 4524
31.3"
8.05
9.93
338°
12h 28m 07s
-60° 02' 19"
---
n/a
Cape Obs. 12
2.1"
7.31
8.23
201°
12h 28m 17s
-61° 45' 56"
60845
77.35
Gamma
123.0"-155.1"
1.63
6.42-9.50
 27°-86°
12h 31m 10s
-57° 06' 47"
61084
n/a
Holden 116
1.9"
7.16
9.05
183°
12h 38m 07s
-55° 55' 52"
61639
88.46
Hershel 4543 AC
29.8"
6.50
9.80
95°
12h 43m 45s
-58° 55' 34
---
n/a
Cordoba 140
4.8"
7.59
10.06
97°
12h 45m 14s
-62° 13' 03"
62227
n/a
Iota
28.1"
4.72
10.24

12h 45m 38s
-60° 58' 52"
62268
n/a
Hershel 4548
52.1"
4.63
8.75
167°
12h 46m 22s
-56° 29' 20"
62327
n/a
Beta 44.3"
1.25
11.40
322°
12h 47m 43s
-59° 41' 19"
62434
n/a
Mu
34.8"
4.03
5.08
17°
12h 54m 37s
-57° 10' 06"
63005
n/a

Notes: 
For understanding DIs and how they are calculated, please read this article!
n/a: Not applicable: Difficulty Indexes are calculated only for those doubles that have separations between 1.0 and 10.0 seconds of arc and shine with a difference of magnitude between 0 and 5.


Reports on Southern doubles fron Northern members

Bob Hogeveen's Report (n.b.hogeveen@hetnet.)

One of the occasions on which I visited the Southern hemisphere was in 2001, "around" the Total Solar Eclipse of June 21. It was a trip I made with some other Dutch observers to Zambia and Zimbabwe. We observed the Eclips in Zambia and then went of to Zimbabwe where spent a few days in Mana Pools N.P. and where we enjoyed the clearest, darkest night one can imagine (and moonless!).

There were no real astronomical scopes at hand exept one C5 and besides a few looks through this C5 I made my own observations with my Swarovski AT80 birdwatching scope (which made overtime during the day as well as you can imagine). My fieldscope is not very suitable for observing doubles because of it's limited magnification (max. 60x) and besides that most of the time during the clear nights I concentrated on the many spectacular deepsky objects which can be seen in the area of Vela, Carina and Centaurus.

In Crux it were of course the Jewelbox Cluster (NGC4755) and the conspicuous Southern Coalsack which took first attention. But the doubles were not forgotten. I had made a list of some easy to spot-and-split doubles and indeed some of the S33-project doubles in Crux were also observed. In the end I observed four doubles in Crux on that occasion, Alpha, Beta, Gamma and Iota.

Alpha is a real showpiece for this kind of scope, and I expect for most kind of scopes.
The AB-pair could just be split, a thin dark line separating the two bright stars. On moments of less good seeing the stars touched and the pair turned into a bright, white little snowman. There is another component (C) which is easily visible, magn. 5, at a distance of  90".

The other tree pairs were far less spectacular. Iota and Gamma are "ordinary" doubles (rating 3), no problem for the Swarovski to spot and split them.


Of Beta I did not observe the B-component which is given in the project (mag. 11.4 @ 44.3") but another star which sits 270" to the west of A and is mag. 8.8. The information I had indicated that this was the "B-star", or at least a star that is paired with Beta-A. Now I tend to believe that it is just a field-star.

Greetings from Holland and have fun with, and clear skies for the new project.
Bob
www.homepages.hetnet.nl/~nbhogeveen
  
 

Steve Bodin Report (sdbodin@hotmail.com)


Thanks to Luis this set of Crux observation of 2 years past is presented. Travelled to New Zealand during the Northern winter of 2002 and, of course, packed a travel scope and small video camera that runs on a 9v battery. Astronuts have a different kind of camera for taking holiday snaps.  Wife and I rented a camper van in Auckland and spent a tropical holiday along the scenic beauty of the Northland region of the North Island. Many wonderful camp areas on secluded bays and forests with sunny days and dark nights. the wonder of the southern sky can not be described to a ' Northener'; it has to be seen to be believed.

General Data:
Observer: Steve Bodin
Location: 90 Mile Beach, Northland, New Zealand
Date: 11 Jan 2002, 11 pm to 2 am
Classification: rural
Conditions: temp 60F, damp
Darkness: Limit mag 6.5+
Transparency: good
Seeing:  7-8/10
Telescope: 4 inch Meade 107D on ETX Mount
Eyepieces: 24mm televue, 10mm homebuilt
Additional: B/W video camera, pf and 2x
Magnification: 42x, 100x visual, 150x, 300x video

Alpha Crux,
Jewel of the night sky, maybe the best double in the sky. Twin blue-white diamonds close and brilliant, with a small distant third companion. Not split at 42x, but easy at 100x. Video camera needed 2x barlow to get a sufficient separation for measurement, but still close. Didn't have my current integrating color camera then, only two years ago, video technology has expanded 100 fold in 2 years, could reach only mag 7 then 14 now with the 4 inch telescope. Masurement, AB 3.98 sec at 117 deg PA, AC 90.5 sec at 203 deg PA.

a

Gamma Crux,
Very orange primary and contrasting blue faint secondary, third fainter companion noted farther, easy at low power. The B/W portable video camera could barely see the B star and the C star was too faint. Measured AB 128.8 sec at 27 deg PA.

g

Mu Crux,
Two bright stars, easy at any magnification. Both noted as Blue-white in color. This would be a very fine pair for small scopes in any hemisphere, but is overshadowed by the other wonders of Crux. Measurement, 36.1 sec at 15 deg PA.

m

No other doubles observed in Crux as I concentrated on the famous bright pairs and all the other wonders such as the Jewel Box cluster and Coal Sack.

Eager for another Trip,
Steve Bodin


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