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Some lovely skyscapes.

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#1 3c_273

3c_273

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Posted 17 February 2017 - 09:52 AM

One of the nicer things about celestial tourism is that we often get to "discover" interesting asterisms of stars, and unexpected things not mentioned in our catalogs, planetarium programs, or guidebooks. Last night, despite chilly temperatures (-6 C, 21F) and only Pickering 6 seeing,  I came across a few of these in my survey of the Struve double stars (STF, in WDS discoverer parlance).

 

STF 940:

Telescope: C-8, Observatory: Little Tycho, Date: 2017 Feb 16, Time: 22:52:28
A nice pair in a rich field. The deep orange carbon star UU Aur is just east
of it. Above it is a wide pair of 11mv stars not in the WDS. Aladin/UCAC4: The
proper motions of the 11mv pair are different. WDS data: 8.76 - 10.29mv, A5,
294.10° pa, 10.230", 2010.

 

STF 856:

Telescope: C-8, Observatory: Little Tycho, Date: 2017 Feb 16, Time: 22:11:31
The southern member of a trio of very wide pairs, all with about the same
theta and all in the same line. The brighter star of the northern pair is STF
852AB. The brighter member of the southern pair is STF 856. A lovely skyscape.
WDS data: 8.5 - 10.99mv, A0, 50.30° pa, 10.230", 2010.

 

One can also make (minor!) discoveries:

 

ALI 324:

Telescope: C-8, Observatory: Little Tycho, Date: 2017 Feb 16, Time: 22:41:0
A nice, if faint, triple, at the apex of an isosceles triangle of 10mv stars.
The third component of ALI 324 is not mentioned in the WDS. Aladin/UCAC4: The third component, C, a 12.1mv star at theta = 107.3d , rho = 22.8" has similar proper motions
with the AB pair: , A: -2.1,-2.7, B: 1.1, -6.8, C: -2.4, -8 in units of
milliarcseconds per year. WDS data: 10.34 - 11.69mv, U, 21.30° pa, 14.330",
2010.

 

Whereas with things like TV, we can say with confidence that "We've seen it all", the night sky is pretty much inexhaustible in its wonders.

 

Well worth braving the cold (for us in the northern hemisphere, that is!) to see these, and other, perhaps undiscovered, skyscapes.

 

 


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