Nova Sgr 2000 = V4642 Sgr

(CCD image at Kyoto University, 2000 Feb. 10)

(vsnet-alert 4167)

According to IAUC 7362, Yukio Sakurai discovered a possible nova in Sgr. 

   17h 55m 09s.84  (J2000.0, Y. and R. Kushida)
   -19o 46' 01".0

     mag 11.5 (Jan. 25.863, Sakurai, prediscovery)
         10.5 (Feb.  4.863, Sakurai, discovery)
         10.4CCD (Feb. 6.812, Y. and R. Kushida)
Spectroscopic and photometric observations are strongly encouraged. The region seems to be slightly obscured by molecular clouds. So the it may be moderated reddened.

Regards,
Taichi Kato

Tycho comparison stars 

GSC6258.527 175612.76 -194926.2 (2000.0)  9.55 6
175613.4 -194958 (2000.0) HD163295 10.0 9.5 A3
175612.8 -194925 (2000.0) 967 0.51 TYC6258.527.1 plx=61.8(21.0) (0.04 0.04)
175612.1 -194921 (2000.0) CPD-19.6311 9.1
175612.8 -194942 (2000.0) SD-19.4751 9.2
  Tycho V=9.67

GSC6258.799 175541.34 -194916.1 (2000.0)  9.48 6
175540.4 -194913 (2000.0) HD163189 *A2MA7/8-F0(Michigan)
175541.2 -194915 (2000.0) SAO160907 99.9 9.0 A0
175542.0 -194859 (2000.0) A7:M(Buscombe) V=9.5 - -
175543.4 -195003 (2000.0) HD163189 9.5 9.5 A0
175541.4 -194915 (2000.0) 954 0.54 TYC6258.799.1 plx=-45.3(21.5) (0.03 0.04)
175540.8 -194909 (2000.0) CPD-19.6303 9.1
175541.7 -194931 (2000.0) SD-19.4748 9.0
  Tycho V=9.54

GSC6258.469 175458.20 -195324.3 (2000.0) 10.35 6
GSC6258.1157 175459.63 -195307.2 (2000.0) 11.66 6
175458.2 -195324 (2000.0) 1043 0.54 TYC6258.469.1 plx=143.6(67.5) (0.07 0.08)
175457.1 -195328 (2000.0) SD-19.4741 9.3
175457.5 -195323 (2000.0) CPD-19.6293 9.7
  Tycho V=10.43

Early photometry

Observations from IAUC and reports to VSNET. The possible nova is apparently fading. 

  YYYYMMDD(UT)   mag  observer
  20000125.863  115p  (Y. Sakurai)
  20000204.837  112p  (K. Takamizawa)
  20000204.842  112p  (K. Takamizawa)
  20000204.863  105p  (Y. Sakurai, discovery)
  20000206.812  104C  (Y. and R. Kushida)
  20000209.832  120p  (K. Takamizawa)
  20000209.842  120p  (K. Takamizawa)
  20000210.862  10.77C  (Ouda team)
  20000210.865  <104  (H. Maehara)

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