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[vsolj-alert 348] SN1999cl in M88

SN1999cl in M88

  AL Comを見ていると超新星がみつかるかも？との噂通り、Ｍ８８に超新星らしき
　天体が発見され、１日で１６等から１５等に増光中とのこと。今回はAL Comのチ
　ャートや比較星がそのまま使えますので初期から光度体系の統一が行えます。

Subject: [vsnet-alert 3065] Sequence for M88 supernova

     Although there is no sequence specifically for NGC 4501 = Messier 88,
the Misselt BVR data for the dwarf nova AL Comae in the adjacent field may be
suitable at least for CCD observers.  N.B. that I have adjusted Misselt's V
magnitudes upward (brighter) by 0.04 to compensate roughly for the typical
zero-point offset in his data.
     In addition, there are several brighter stars close to M88 measured by
Richard Stanton.  The data are not published, and I have used the Thompson &
Bryan chart for the galaxy (which shows AL Com also) to get positions and the
rough V magnitudes for his stars.
     Finally it is worth noting that the offset from V for the GSC magnitudes
is quite small, and these might be used for some additional sequence stars.

\Brian



Name                  RA  (2000)  Dec    s     GSC       V    B-V   V-R     R
[S66c] 1200+15 8   12 32 07.5  +14 42 52 G  0880-0941  11.24  0.33 (0.21) 11.03
AL Com 1           12 32 16.0  +14 19 21 A             16.77  0.77  0.46  16.31
AL Com 2           12 32 26.6  +14 21 17 A             16.93  0.47  0.32  16.61
AL Com 3           12 32 27.9  +14 21 51 A             16.69  0.70  0.36  16.33
AL Com 4           12 32 29.7  +14 20 16 A             17.81  0.64  0.36  17.45

Note:  V-R in parens derived from B-V


Stanton V sequence
NGC 4501 119       12 32 03.9  +14 20 08 A  0880-0226  11.9
NGC 4501 120       12 31 57.1  +14 28 52 A  0880-0023  12.0
NGC 4501 135       12 32 10.0  +14 20 15 A  0880-0182  13.5
NGC 4501 137       12 32 01.2  +14 31 23 A  0880-0266  13.7
NGC 4501 139       12 32 09.5  +14 15 54 A  0880-0093  13.9
NGC 4501 147       12 32 08.8  +14 28 44 A  0880-0188  14.7

Subject: [vsnet-alert 3066] SN 1999cl in NGC 4501

Dear SN watchers,

Bright SN has been discovered by LOSS KAIT team.  See IAUC 7185 for
details.  The host galaxy NGC 4501 is fairly nearby one (v_r is about
2500 km/s), so the expected SNeIa maximum would be order of 14 mag.
Followup is urged.

Sincerely Yours,
Hitoshi Yamaoka, Kyushu Univ., Japan
yamaoka@rc.kyushu-u.ac.jp

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