NGC/IC Project Restoration Effort

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NGC2495

 

Basic Information


Location and Magnitude


Right Ascension: 8:0:33.2
Declination: +39:50:26
Constellation: LYN
Visual Magnitude: 15.2

Historic Information


Discoverer: Mitchell
Year of discovery: 1855
Discovery aperture: 72.0

Observational


Summary description: Follows III 750 2' or 3', eF, vS
Sub-type: Sd

Corwin's Notes

===== NGC 2495. There is a chance that we have misidentified this galaxy. LdR's observations of this and NGC 2493 may refer to other objects as some of his remarks are mystifying if these are the two objects he was indeed looking at. For NGC 2493, he says (twice, on 12 Jan 1855 and 14 Feb 1855), "A F * p", but the nearest stars are north-northwest and south-southwest, in other words, more north and south than preceding. Similarly, for NGC 2495, he says (on 14 Feb 1855), "a nebs knot follows 2' or 3' dist." But on 5 March 1867, he has "neb nf is eF, difficult, Pos 54[deg] (2), Dist 12 [arcsec] (2)." Dreyer noted the problem in the 1880 monograph, saying, "The estimated dist in the obs from 1855 is very different; was a different object seen? or should the Dist 12[arcsec] be increased by 65[arcsec] = 1[superscript 'r']?" Since the actual distance is 115 arcsec, it seems likely that the distance should have been recorded as 122 arcsec (two rotations of the micrometer screw plus the additional 12 arcsec). But even this change would still not explain the position angle which is 74 degrees, not 54 degrees. So, there is a minor mystery here. Finally, to add to the intrigue, the fainter galaxy is also Markarian 383 and KUG 0757+399, picked out in both surveys for its excess ultraviolet continuum. But the position given in the KUG list is for a star about 25 arcsec east of the galaxy.

Steve's Notes

===== NGC 2495 17.5" (2/24/90): extremely faint and small, round. A mag 14.5 is off the east edge 24" from center. Forms a pair with much brighter NGC 2493 1.8' WSW.