NGC/IC Project Restoration Effort

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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

===== 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

===== 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.