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[vsnet-campaign-sn 323] Photometric Calibration of the SN2002an Field
Table 1 gives the V and Rc magnitudes of field stars near the position
of SN2002an. These observations are provided to assist in photometric
calibration of the SN magnitude. The observations were taken under
photometric conditions on 01/25/02 UT with a 0.2 m SCT and a SBIG
ST-8 CCD camera. Research grade V and Rc filters were used. The
magnitudes have been color and airmass corrected. The magnitudes were
calculated by averaging two observations per star. The estimated error
is +/-0.04 magnitude. Table 3 gives the magnitudes, positions, and the
source of the magnitudes of the photometric reference stars. MIRA
software was used to extract the fluxes and all sky photometric
reductions were accomplished using the Henden and Kaitchuck PEP software.
Table 1 - Measured magnitudes of stars near SN2002an
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Star Hel. J.D. Air Mass V V-R
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GSC 1941_1556 2452299.6494 1.341 11.438 0.349
GSC 1941_1528 2452299.6494 1.344 11.506 0.572
GSC 1928_103 2452299.6488 1.347 12.052 0.378
GSC 1941_1940 2452299.6488 1.348 13.193 0.536
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Table 2 - Positions (J2000) of the SN2002an Field Stars
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RA DEC
Star h m s d m s
-----------------------------------------------------------------------
GSC 1941_1556 8 22 37 24 25 43
GSC 1941_1528 8 23 15 24 27 3
GSC 1928_103 8 22 13 24 11 5
GSC 1941_1940 8 22 47 24 15 53
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Table 3 - Positions (J2000) and Magnitudes of the Reference Stars
------------------------------------------------------------------------------
-----------------
RA DEC
Star h m s d m s V V-Rc Source
------------------------------------------------------------------------------
-------------------
GSC 4822_3559 7 4 9 -3 53 0 10.707 0.031 A. Henden
SAO 117737 9 29 55 5 39 20 7.201 0.582 Cousins (1980)
MMJ 6481 8 48 28 11 56 39 10.018 -0.037 M67, Henden
MMJ 6499 8 48 46 11 58 34 9.653 0.673 M67, Henden
MMJ 6487 8 48 43 11 59 59 10.488 0.340 M67, Henden
------------------------------------------------------------------------------
-------------------
Table 4 - Time and Air Mass of the Reference Stars
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Star Name filter Hel. J.D. UT(hours) Air Mass
-----------------------------------------------------------------------
MMJ 6481 V 2452299.6341 3.0833 1.8927
- Rc 2452299.6362 3.1333 1.8623
MMJ 6499 V 2452299.6341 3.0833 1.8948
- Rc 2452299.6362 3.1333 1.8643
MMJ 6487 V 2452299.6341 3.0833 1.8936
- Rc 2452299.6362 3.1333 1.8631
SAO 117737 V 2452299.6282 2.9500 3.1612
- Rc 2452299.6262 2.9000 3.2614
GSC 4822_3559 V 2452299.6167 2.6833 1.7342
- Rc 2452299.6195 2.7500 1.7089
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by Doug West
vsnet-adm@kusastro.kyoto-u.ac.jp
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