NGC/IC Project Restoration Effort

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NGC3107

 

Basic Information


Location and Magnitude


Right Ascension: 10:4:22.4
Declination: +13:37:19
Constellation: LEO
Visual Magnitude: 13.4

Historic Information


Discoverer: Herschel W.
Year of discovery: 1794
Discovery aperture: 18.7

Observational


Summary description: pF, pL, iR, * 8 148°, 112"
Sub-type: Sbc

Corwin's Notes

===== NGC 3107. Given WH's estimated position -- "3/4 deg following, 1/2 deg north [of the] Georgian planet," it's a wonder that this object was ever recovered. However, WH also noted that the object is "3 arcmin north of a pL red star." This pair of objects is unmistakeable enough that LdR had no trouble finding it in spite of the poor position, and the confusion in the GC description ("L red star north 3 arcmin"). It must be said, however, that the GC position, presumeably from CH's reduction of WH's observations, is remarkably good, being only 6 arcmin south and 5 seconds east of the galaxy. Dreyer picked the wrong star, however, as the "red" star near the nebula. This led him to assign the wrong position to the nebula in his note in the GC Supplement, in LdR's observations, and in the NGC. The correct star is SAO 98932 (spectral type K2), not SAO 98925 (spectral type F5). Using the SAO position for the correct star, and LdR's micrometric offsets, leads to a position for the galaxy that is within an arcsecond of the GSC position.

Steve's Notes

===== NGC 3107 17.5" (1/23/88): moderately bright, fairly small, slightly elongated NW-SE. Located 1.8' NW of mag 8.1 SAO 98932.