C. B. Stephenson, Warner and Swasey Observatory, writes that this object has been identified on a Burrell Schmidt direct plate taken on 1968 Oct. 14. The plate, taken in the V magnitude system, can be calibrated photometrically with the aid of an overlapping V plate of the NGC 6882/5 field, for which accurate photometry is given in Publ. U.S. Naval Obs. 17, part 7. The resulting magnitude (obtained without means of determining any color equation) for the object was V = 14.1 +/- 0.15 (p.e.). An infrared objective-prism plate (range 6800-8800 A, dispersion 1700 A/mm) taken on 1958 Aug. 30 also shows the object, at I ~ 9.5, near, but usably above, the plate limit; the spectrum appears to be of class M4.
International Astronomical Union Circular
- Pub Date:
- May 1979