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[vsnet-chat 4873] Photoelectric V sequence preceding Nova Cen 2001
- Date: Thu, 4 Oct 2001 17:33:44 +1000
- To: <vsnet-chat@kusastro.kyoto-u.ac.jp>, <vsnet-sequence@kusastro.kyoto-u.ac.jp>, <aavso-discussion@informer2.cis.mcmaster.ca>
- From: "Mati Morel" <morel@ozemail.com.au>
- Subject: [vsnet-chat 4873] Photoelectric V sequence preceding Nova Cen 2001
- Cc: <varstar@voyager.co.nz>, <afjones@voyager.co.nz>
- Sender: owner-vsnet-chat@kusastro.kyoto-u.ac.jp
I have retrieved a published V sequence (field 995 of L.O.Loden
1979), which may be helpful in calibrating UCAC1 mags etc for the new nova
in Centaurus. The sequence lies about 40 arcminutes south-preceding the
nova. There are no stars of strong colour in this sequence, but may be
awkward to use for direct visual comparison, being rather distant. For
direct visual comparison I suggest observers use the following stars, with
Tycho2 data:
GSC V B-V RA (2000) DEC (2000)
===============================================
9012.02137 8.84 0.00 13:51:19.0 -64:31:35 HD 120418
9012.01879 10.34 0.04 13:55:13.6 -64:17:45 HD 121044
9012.00881 10.72 0.45 13:55:08.7 -64:29:57
9012.00707 10.02 1.08 13:57:28.4 -64:14:44
9012.00911 9.04 0.07 13:57:42.6 -64:13:08 HD 121475
Loden's sequence. Field 995. Astron. Astrophys. Suppl. 38,355-365 (1979).
No. CPD V B-V U-B RA(2000) DEC(2000) Other Id.
==================================================
1. -64 2603 9.07 1.00 0.58 13:52:51.8 -64:49:24 HD 120647
2. -64 2591 9.08 0.17 0.19 13:51:52.7 -64:57:41 HD 120495
3. -64 2589 10.33 0.24 0.18 13:51:33.3 -64:53:04
4. -64 2583 10.56 0.30 0.26 13:50:59.5 -64:54:30
5. -64 2611 10.83 0.30 0.20 13:53:50.4 -64:51:12
6. -64 2590 10.87 0.27 0.15 13:51:50.3 -64:51:41
7. -64 2582 11.04 0.55 0.12 13:50:55.9 -64:52:20
8. -64 2580 11.15 0.05 -0.21 13:50:48.4 -64:56:34
9. -64 2587 11.20 0.59 0.09 13:51:21.4 -64:49:41
10.-64 2581 11.30 0.28 0.24 13:50:54.5 -64:44:11
11.-64 2611 11.30 0.30 0.20 13:53:50.4 -64:51:12
12.-64 2606 11.49 0.21 -0.11 13:53:17.3 -64:48:28
13.-64 2576 11.50 0.33 0.28 13:50:01.3 -64:47:31
14.-64 2578 11.50 0.39 0.22 13:50:18.7 -64:45:51
15. ............ 11.56 0.41 0.31 13:52:36.6 -64:46:18
GSC9012.01791
16.-64 2602 11.73 0.22 0.17 13:52:51.1 -65:01:53
17. ............. 11.76 0.65 0.11 13:51:53.4 -64:59:02
GSC9012.00914
18. ............. 11.87 0.29 0.24 13:52:28.7 -64:46:15
GSC9012.01767
19. ..............12.06 0.26 0.12 13:52:31.7 -65:00:48
GSC9012.00722
20. ..............12.30 0.19 -0.16 13:51:29.6 -65:00:59 GSC9012.01424
21. ..............12.89 0.30 0.24 13:51:58.3 -64:59:43
Stars 5 and 11 listed as one in CPD and GSC.
Positions of stars 1-20 taken from GSC. Star 21 taken from USNO-A2.0
Regards,
Mati Morel
morel@ozemail.com.au
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