V463 Sct = HadV46 = Nova Sct 2000



(CCD image by Seiichiro Kiyota, by coutesy of Kiyota)


(Spectrum taken by Mitsugu Fujii on Mar. 16.81 UT, by coutesy of Fujii)

(vsnet-alert 4379)

HadV46: new variable star (unusual?)

Katsumi Haseda (haseda@mxs.mesh.ne.jp) reports the discovery of a new large amplitude variable star. Although the light variation is not inconsitent with a Mira-type variable, the examination by Haseda of the RealSky image confirms the identificationith

= USNO0750.13650086 183404.041 -144500.23 (2000.0) 14.4 15.5

, which is not red as expected from the light variation. More detailed observation (multicolor photometry and possibly spectrocopy) would be desired to clarify the nature of the object. The object is bright now.

   A formatted vsnet-newvar report will appear later.

object         YYYYMMDD(UT)   mag  code
HadV46         19960525.676  126p  Had.VSOLJ (*1)
HadV46         19980816.522  <133p  Had.VSOLJ
HadV46         19981108.403  <133p  Had.VSOLJ
HadV46         19990219.822  <133p  Had.VSOLJ
HadV46         19990322.782  <131p  Had.VSOLJ
HadV46         19990831.483  <130p  Had.VSOLJ
HadV46         20000206.844  120p  Had.VSOLJ
HadV46         20000305.810  106p  Had.VSOLJ

(*1) revised to <130p after later examination of the original photograph

Observer's code:
  Had: K. Haseda (Aichi Japan) 10cm F4.0 twin patrol camera + T-Max400(120)

(vsnet-alert 4382)

I note that the odd colors (mb=14.7, mr=14.4 in USNO-A2.0 by the way) could be due to the very crowded nature of the field, which often results in the PMM classifier being unable to handle the scan data.

\Brian

(vsnet-alert 4383)

>      I note that the odd colors (mb=14.7, mr=14.4 in USNO-A2.0 by the way)
> could be due to the very crowded nature of the field, which often results
> in the PMM classifier being unable to handle the scan data.
Possible explanation. One might note that a Mira star of this brightness would have been easily recorded in IRAS PSC, but that the IRAS source mentioned looks more closely associated with the redder (on USNO) star. Probably a few immediate multicolor snapshots (or even an unfiltered CCD image) would solve the problem.

Regards,
Taichi Kato

(vsnet-chat 2730)

Date: Sun, 12 Mar 2000 11:40:09 +0000
From: JG 
Subject: HadV46 USNO colour
Dear Taicho Kato

First I not that this object appears to lie on the edge of a Lynd dark nebula, which is itself amongst a sea of other such nebu which I suppose should have made it appear even redder!

The A type star HIP 90991, a mag 5.7 star, lies quite close and if you can plot the USNO stars in this region as a half degree square of objects coded in 'b-r' by 'colour', and centred on HadV46's position, you'll note a strange vertical 'blue streak' amidst a 'sea of yellow' ascending from this HIP star [a bit generalised]. Although there is nothing to stop all these stars being blue here, at certain resolutions it looks like a drop of liquid that has run! HadV46's position lies just east of this 'blue streak'.

I'm quoting for object USNO0750.13595197 using version 1.3 of Arne Henden's freeware DOS search program on USNO A2.0 data [end figure RA = 4.049s, end figure Dec 00.23"], so I suppose you're quoting A1.0?

Yours

John

John Greaves
UK

Rapid fading

(vsnet-alert 4398)

Katsumi Haseda (Aichi, Japan) reports the rapid fading of HadV46, the newly discovered possibly unusual variable star by Haseda (vsnet-alert 4381). We have obtained some CCD images this morning, and will inform the result later.

  YYYYMMDD(UT)   mag  observer
  19980816.522  <133p  (K. Haseda)
  19981108.403  <133p  (K. Haseda)
  19990219.822  <133p  (K. Haseda)
  19990322.782  <131p  (K. Haseda)
  19990831.483  <130p  (K. Haseda)
  20000206.844  120p  (K. Haseda)
  20000305.810  106p  (K. Haseda)
  20000313.816  116p  (K. Haseda)
  20000313.819  116p  (K. Haseda)

CCD photometry and astrometry

(vsnet-alert 4403)

Message from Hitoshi Yamaoka:

I have done astrometry of HadV46 with Kyoto image taken on Mar. 14.9 UT with GSC-ACT references, then found that the object locates at 18h34m03s.16, -14o45'11".46 (J2000.0), which is not coincident to USNO0750.13650086 (which is suggested to be identified with HadV46 in vsnet-alert 4381). The accuracy is below 1". The nearest USNO star is about 3" apart from this location:

USNO0750.13648719 183402.899 -144511.66 (2000.0) 15.8 18.0

It is possible that this object is nova, new CV, or the other sort of exploding star. Further observation is extremely encouraged.

Sincerely Yours,
Hitoshi Yamaoka, Makoto Uemura, Taichi Kato

Further to add:

Unfiltered CCD photometry by the Kyoto team based on Tycho star has confirmed that the object is NOT red. The large amplitude of variability suggests some sort of eruptive or cataclysmic variable (including a nova).

  YYYYMMDD(UT)   mag  observer
  19980816.522  <133p  (K. Haseda)
  19981108.403  <133p  (K. Haseda)
  19990219.822  <133p  (K. Haseda)
  19990322.782  <131p  (K. Haseda)
  19990831.483  <130p  (K. Haseda)
  20000206.844  120p  (K. Haseda)
  20000305.810  106p  (K. Haseda)
  20000313.816  116p  (K. Haseda)
  20000313.819  116p  (K. Haseda)
  20000314.855  11.24C  (Ouda team)

HadV46 prediscovery observations by Takamizawa

(vsnet-alert 4407)

HadV46 prediscovery observations by Takamizawa

object         YYYYMMDD(UT)   mag  code
HadV46         19990413.776  <145p  Tmz.VSOLJ
HadV46         19990414.781  <145p  Tmz.VSOLJ
HadV46         19990506.615  <135p  Tmz.VSOLJ
HadV46         19990511.712  <145p  Tmz.VSOLJ
HadV46         19990609.663  <145p  Tmz.VSOLJ
HadV46         19990701.500  <140p  Tmz.VSOLJ
HadV46         19990706.615  <145p  Tmz.VSOLJ
HadV46         19990731.491  <145p  Tmz.VSOLJ
HadV46         19990803.520  <145p  Tmz.VSOLJ
HadV46         19990831.469  <145p  Tmz.VSOLJ
HadV46         19990909.456  <135p  Tmz.VSOLJ
HadV46         19990927.415  <140p  Tmz.VSOLJ
HadV46         19991028.390  <140p  Tmz.VSOLJ
HadV46         19991029.397  <140p  Tmz.VSOLJ
HadV46         19991110.376  <140p  Tmz.VSOLJ
HadV46         19991614.608  <145p  Tmz.VSOLJ
HadV46         20000209.840  122p  Tmz.VSOLJ
HadV46         20000211.844  120p  Tmz.VSOLJ
HadV46         20000216.833  118p  Tmz.VSOLJ
HadV46         20000302.797   99p  Tmz.VSOLJ
HadV46         20000308.780  120p  Tmz.VSOLJ

Tmz: Observer's code:
     Observer: K.Takamizawa (Saku-machi,Nagano,Japan)
     Inst.: 10cmR F4 twin patrol cameras  T-Max400 120
     Comparison stars mag.:GSC&H/T

Tycho-2/Tycho Sequence

(vsnet-alert 4412)

Sequence of HadV46 (possible nova? Sct)

Selected Tycho-2 and Tycho stars (in case Tycho2 magnitudes are available, prefereably use them).

                           V   B-V
183345.1 -144107 (2000.0) 1016 0.32 TYC5703.1547.1 plx=25.6(29.1) (0.08 0.10)
183345.0 -144107 (2000.0) 1017 0.25 TYC2-5703.1547.1 (10.20 0.05) (10.49 0.05)

183404.6 -144721 (2000.0) 1028 0.50 TYC5703.2593.1 plx=176.3(42.1) (0.08 0.10)

183431.4 -145234 (2000.0) 1104 0.21 TYC5703.1775.1 plx=6.8(60.6) (0.17 0.22)
183431.5 -145234 (2000.0) 1099 0.42 TYC2-5703.1775.1 (11.03 0.11) (11.53 0.10)

183431.3 -144847 (2000.0) 1142 0.85 TYC2-5703.1712.1 (11.51 0.16) (12.50 0.28)

183457.1 -144731 (2000.0) 1032 0.07 TYC5703.2130.1 plx=41.7(22.8) (0.09 0.09)
183457.0 -144731 (2000.0) 1023 0.23 TYC2-5703.2130.1 (10.25 0.05) (10.52 0.04)

183328.3 -143925 (2000.0) 1123 0.75 TYC2-5703.718.1 (11.31 0.15) (12.20 0.23)

183406.3 -145051 (2000.0) 1211E 0.16 TYC2-5703.1731.1 (12.13 0.30) (12.32 0.24)

VSNET light curve (requires Java)

Light curve

VSNET data search

Search!

Charts

Charts with Hipparcos/Tycho/Tycho2 magnitudes:

Detailed charts with USNO stars

Return to HomePage

Return to the Powerful Manager, Daisaku Nogami


vsnet-adm@kusastro.kyoto-u.ac.jp