(Discovery image by K. Haseda)
(CCD image by G. Masi)
(CCD images by Antonio Giambersio)
Possible Nova by Haseda
Katsumi Haseda (Aichi, Japan) reports the discovery of a new variable star, which is apparently a nova or a variable star undergoing a nova-like eruption. The position (accuracy 0".5) of the object was measured as follows by K. Kadota from the discovery image by Haseda. The object is located close to the Sco-Sgr border.
17h 57m 06s.98 (J2000.0) -32o 23' 05".0Kadota also comments that there was no object brighter than mag 14 on a CCD image taken on 2000 Feb. 24.842 UT.
There is no known variable star at this position. A search on 2MASS and MSX5C catalogs has not revealed any likely counterpart.
Spectroscopic confirmation, as well as multicolor photometry, is very strongly encouraged.
object YYYYMMDD(UT) mag code PosNova2001 19960326.792 <127p Had.VSOLJ PosNova2001 19970823.503 <129p Had.VSOLJ PosNova2001 19970824.508 <123p Had.VSOLJ PosNova2001 19980330.783 <129p Had.VSOLJ PosNova2001 19980814.515 <127p Had.VSOLJ PosNova2001 19981009.415 <123p Had.VSOLJ PosNova2001 19990221.827 <129p Had.VSOLJ PosNova2001 19990313.799 <129p Had.VSOLJ PosNova2001 19990517.788 <123p Had.VSOLJ PosNova2001 19990803.497 <129p Had.VSOLJ PosNova2001 20000212.837 <123p Had.VSOLJ PosNova2001 20000307.830 <127p Had.VSOLJ PosNova2001 20000313.813 <129p Had.VSOLJ PosNova2001 20000401.798 <129p Had.VSOLJ PosNova2001 20000416.768 <123p Had.VSOLJ PosNova2001 20000429.714 <129p Had.VSOLJ PosNova2001 20000508.741 <129p Had.VSOLJ PosNova2001 20000703.624 <123p Had.VSOLJ PosNova2001 20000708.605 <129p Had.VSOLJ PosNova2001 20000716.585 <123p Had.VSOLJ PosNova2001 20000822.513 <129p Had.VSOLJ PosNova2001 20000917.476 <123p Had.VSOLJ PosNova2001 20010202.860 <120p Had.VSOLJ PosNova2001 20010226.837 <129p Had.VSOLJ PosNova2001 20010319.788 <123p Had.VSOLJ PosNova2001 20010326.803 <123p Had.VSOLJ PosNova2001 20010422.744 <129p Had.VSOLJ PosNova2001 20010513.617 105p Had.VSOLJ PosNova2001 20010517.664 110p Had.VSOLJ PosNova2001 20010528.624 105p Had.VSOLJ PosNova2001 20010615.661 104p Had.VSOLJ Observer's code: Had: K. Haseda (Aichi, Japan) Instruments: 10cm F4.0 twin patrol camera +T-Max400(120)
Possible Nova in Sco.(Haseda's object)
I report the following prediscovery observations on my patrol films. The object may be a slow nova. Congratulations Haseda-san!!
object YYYYMMDD(UT) mag code NovaSco2001 20010426.737 <129p Tmz NovaSco2001 20010512.643 102p Tmz NovaSco2001 20010516.698 112p Tmz NovaSco2001 20010520.692 110p Tmz NovaSco2001 20010525.660 103p Tmz Observer's code Tmz: K. Takamizawa (Saku-machi, Nagano, Japan) Inst.: 10cm F4 twin patrol cameras + unfiltered T-Max400 Sequence: GSC Kesao Takamizawa
SASS (Saku All Sky Survey) Saku-mach, Nagano, 384-0502 Japan
On DSS images (Bj for 1st generation, R for 2nd), there is a dim star whose rmag about 17.5 and bmag about 20.
Sincerely Yours, Hitoshi Yamaoka, Kyushu Univ., Japan firstname.lastname@example.org
Hola, Everyone -
At UT June 21.660, using nearby GSC 7382 837 as a standard and adopting V = 9.87, B-V = +0.44, I measured Haseda's nova-like variable with a CCD to have a broadband V magnitude of 10.68 +/- 0.03. A low dispersion objective prism spectrogram recorded with the CCD shows a very intense red line, presumably H-alpha (but remember V445 Pup !), that is approximately 5 times the brightness of the surrounding continuum. H-beta (?) is weakly present indicating that the star is substantially reddened.
Congratulations Haseda-sen for his discovery ! Cheers,
DSS field (by Yamaoka)
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