NGC/IC Project Restoration Effort

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NGC7028

 

Basic Information


Location and Magnitude


Right Ascension: 21:8:15.0
Declination: +18:28:48
Constellation: DEL
Visual Magnitude:

Historic Information


Discoverer: Marth
Year of discovery: 1863
Discovery aperture: 48.0

Observational


Summary description: vF, S, vlE
Sub-type: NF

Corwin's Notes

===== NGC 7028. This may be lost. There is certainly no nebula near Marth's place, even though he claims to have verified the object. The closest candidate object is a triple star well to the southwest. Since there is no large systematic offset (in Marth's positions from the modern positions) for the other four objects that he found the same night (N7025, N7033, N7034, and N7056), I don't believe that the triple is Marth's object. A possible candidate is CGCG 448-039. It matches Marth's scanty description (very faint, small, very little extended), and the declination is the same, but the RA is over 2.5 minutes of time off. However, the large non-digit difference makes the identity difficult to accept, so I've put a question mark on it in the main table. ----- Looking at this again in April 2016, I'm even less convinced than before that CGCG 448-039 is Marth's object. There are three other galaxies, all at Marth's RA (within his usual uncertainty), two of which are extended. However, looking at the field, I think that the triple star I noted earlier is also a good candidate, so I have put it into the position table. The four galaxies are there, too. Here are some notes on them: CGCG 448-039 -- As I noted earlier, this matches Marth's description and declination pretty well, but is 2.5 minutes of time off his RA. CGCG 449-004 -- This, too, would match Marth's description and the RA matches. But the Dec is about 40 arcminutes south of the nominal Dec. CGCG 449-005 -- This is the brighter of a pair with 449-006. Again, the RA fits, but the Dec is off by 17 arcminutes, and the galaxy is very nearly exactly round. CGCG 449-006 -- Here is another extended galaxy at more or less the right RA. However, the Dec is again off by about 17 arcminutes and the galaxy is fainter than its close companion 449-005; it has a lower mean surface brightness as well. So, if this Marth's object, why did he not pick up the brighter companion? In the end, I see no really good candidates for this NGC entry. I slightly favor the triple star, but it might be too bright to be mistaken for a nebula at the eyepiece of a 48-inch reflector. Visual examination is needed.