Nova Sgr 1998 = V4633 Sgr

Light curve

Light curve (Java)

***** NOVA SAGITTARII 1998 *****

In IAUC 6846 William Liller (Vina del Mar, Chile) reports his discovery and observations of a probable nova of mag. 7.8 on exposures from 1998 Mar. 22.363-22.366 UT. He was using an 85-mm lens with an orange filter and Technical Pan film. The object was not detected and fainter than mag. 11.5 on images taken four days earlier. A low-resolution spectrum from Mar. 23 showed H-alpha in emission, which is characteristic of a nova. CCD-photometry from Mar. 23.316 UT gave V=7.74.

The nova is located at R.A. = 18h21m40s.5, Decl.=-27o31'38" (2000.0). This position is based on astrometry reported in IAUC 6847 by S. Nakano and G. J. Garradd from CCD-exposures by Y. Kushida, M. Aoki and Garradd.

                         Bjoern H. Granslo
                      (bgranslo@astro.uio.no)

Hipparcos/Tycho sequence

(vsnet 1358)

Hipparcos/Tycho stars around Nova Sgr 1998

181657.7 -274252 (2000.0) V=6.664(4) b-y=0.777(4)  (ground-based data)
182021.1 -272427 (2000.0) 725H 1.37 HIP089871 plx=5.18(1.15) (0.01 0.02)
182326.2 -273008 (2000.0) 810H 0.14 HIP090121 plx=2.10(1.19) (0.01 0.02)
181943.2 -273021 (2000.0) 805 0.23 TYC6852.3985.1 plx=4.8(10.5) (0.02 0.02)
182102.6 -274829 (2000.0) 946 0.38 TYC6852.1688.1 plx=-28.2(25.8) (0.04 0.06)
182351.7 -271738 (2000.0) 962 0.61 TYC6852.4266.1 plx=7.5(29.7) (0.04 0.05)
181938.1 -273131 (2000.0) 976 0.62 TYC6852.4687.1 plx=-22.4(49.8) (0.07 0.08)
182334.2 -274219 (2000.0) 977 0.56 TYC6852.2466.1 plx=11.6(24.6) (0.05 0.06)
182209.1 -272003 (2000.0) 1009 0.77 TYC6852.2098.1 plx=34.9(39.3) (0.06 0.08)
182121.6 -272401 (2000.0) 1042 0.23 TYC6852.3432.1 plx=-38.3(48.6) (0.10 0.12)