NGC/IC Project Restoration Effort

(This is a very very beta version)

NGC4139

Basic Information

Location and Magnitude

Right Ascension: 12:4:34.0
Declination: +1:48:5
Constellation: VIR
Visual Magnitude: 13.7

Historic Information

Discoverer: d'Arrest
Year of discovery: 1863
Discovery aperture: 11.0

Observational

Summary description: F, S, diffic, p of D neb
Sub-type: SB0

Corwin's Notes

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NGC 4139 = IC 2989.  The RA's of this and its companion NGC 4140 are 5 minutes
of time too large.  When corrected by this amount, the positions agree closely
with those for IC 2989 and NGC 4077, respectively.  The descriptions clinch 
the identities, and RC3 is correct.  

This pair was also seen by David Todd during his search for "the trans-
Neptunian planet."  It is his numbers (14a) and (14b), as well as (16a) and
(16b).  See NGC 3604 for more about David Todd and his search.

Steve's Notes

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NGC 4139

17.5" (5/10/86): faint, very small, elongated 2:1 SW-NE, small bright core.  Forms a close pair with NGC 4077 just 1.3' NW in a group.  Located 6.0' SSE of NGC 4073.  Listed as "not found" in RNGC and identified as IC 2989 in UGC, MCG and CGCG as d'Arrest's RA is 5 minutes too large.