NGC/IC Project Restoration Effort

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NGC4028

 

Basic Information


Location and Magnitude


Right Ascension: 11:58:35.8
Declination: +16:10:38
Constellation: COM
Visual Magnitude: 12.3

Historic Information


Discoverer: Herschel W.
Year of discovery: 1783
Discovery aperture: 18.7

Observational


Summary description: vF, vS, vlE, r
Sub-type: S0-a

Corwin's Notes

===== NGC 4028 = NGC 4014, in spite of what JH had to say in a note in GC (repeated by Dreyer in the NGC Notes). This is one of WH's early discoveries (30 Dec 1783). As with other objects found during the fall and winter of 1783-1784, the position is not very good. However, WH's full record can be found in the Herschel Archives (CH's fair copy) and was also published by Dreyer in the 1912 Scientific Papers. There, we find the note, "... It forms an isosceles triangle with two small stars {Dreyer's note:} [by a diagram, these are about 6 arcmin sp.]. ..." The stars precede N4014 by the correct amount, so I am pretty sure that it is WH's nebula. This requires WH to have made two 2 min errors in his RA offsets from two different stars on two different nights. While it is highly unlikely that he would make two such errors leading to much the same position -- this is what prompted JH's comment -- this is apparently exactly what happened. The configuration on the sky is too outstanding to be mistaken.

Steve's Notes

===== NGC 4028 See observing notes for NGC 4014.