[vsnet-chat 337] V1830 Sgr comparison stars

[bas@bom.gov.au (Bruce Sumner)]

	V1830 Sgr Comparison Star Sequence

UBV magnitudes of comparison stars for V1830 Sgr were measured
by Nicklaus Vogt at ESO in Chile in 1977. They are all correctly 
shown on Mati Morel's VSS RASNZ chart 582. To help those without
access to this chart in identifying these stars in this very 
crowded field I have added J2000 coordinates, derived from DSS 
and accurate to +/- 1".

 No.	        (J2000)     Nights  V    B-V   U-B   VSNET
  1	18 13 45.5  -27 41 18  5  10.31  0.01 -0.38  10.31
  2   	18 13 50.6  -27 42 13  1  12.03  1.62  1.24  12.55
  3	18 13 52.7  -27 43 11  1  14.36  0.79  0.37  13.68 See Note 1
  4	18 13 53.1  -27 43 06  1  14.37  1.20  2.2   13.68 See Note 1
  5 	18 13 52.4  -27 43 16  1  15.58  0.70  0.5   Not shown

Note 1: VSNET 13.68 on V1830 Sgr chart (vsnet 1028), 1' south of
	V1830 Sgr, is actually a merge of 3 stars; Nos. 3 and 4 
	above at magnitudes 14.4V, separation 8", and a third
	fainter star, about magnitude 15.0, 4" west of star No. 3.

Reference:  Publication No. 5, VSS RASNZ, 1977.

Regards,

Bruce Sumner
Melbourne

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