Central Bureau for Astronomical Telegrams
IAUC 8189: Sats OF MARS; 2003gv, gw, hc, he, hf, hi, hj, hk, hl, hm, 2003hp
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Circular No. 8189
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)
SATELLITES OF MARS
D. K. Lynch, R. W. Russell, D. L. Kim, H. B. Hammel, and R. B.
Perry report that 3- to 13-micron spectroscopy of the satellites of
Mars on Aug. 21.6 UT, obtained as noted for V2573 Oph on IAUC 8186,
showed significant departures from a single-temperature gray-body
function. The 5- to 12-micron color temperatures of Mars II
(Deimos) and Mars I (Phobos) were 310 +/- 5 and 345 +/- 5 K,
respectively -- significantly higher than the blackbody thermal
equilibrium temperature (237 K) at Mars' heliocentric distance.
Relative to the color-temperature fits, Deimos exhibited
significant excess emission between 8 and 10.5 microns, and Phobos
showed only marginal excess emission. These findings are based on
a flux model for the calibrator alpha Tau that includes the SiO
absorption between 7.9 and 10 microns; similar results were found
when the data were reduced relative to alpha Lyr. Measured
infrared magnitudes: Phobos, L = 6.3 +/- 0.07, M = 4.2 +/- 0.07,
[N(10.2 microns)] = 0.05 +/- 0.07; Deimos, M = 5.3 +/- 0.3, [N(10.2
microns)] = 0.76 +/- 0.05.
SUPERNOVAE 2003gv, gw, hc, he, hf, hi, hj, hk, hl, hm, 2003hp
A. V. Filippenko and R. J. Foley, University of California,
Berkeley; and F. J. D. Serduke, Lawrence Livermore National
Laboratory, report that inspection of CCD spectra (range 320-1000
nm), obtained on Aug. 28 UT with the Shane 3-m telescope at Lick
Observatory, reveals that SN 2003hj (IAUC 8184) is of type Ia,
about 2 weeks past maximum brightness, at redshift 0.076
(determined from narrow H_alpha emission in the host galaxy
nucleus). Supernovae 2003hi (IAUC 8184), 2003hl (IAUC 8184),
2003hk (IAUC 8184), 2003gv (IAUC 8175), and 2003hc (IAUC 8179) are
all relatively normal type-II supernovae, with hydrogen Balmer
lines having P-Cyg profiles. SN 2003gw (IAUC 8176) is also
probably of type II, but the noisy spectrum exhibits only rather
narrow (FWHM = 2000 km/s) H_alpha emission. SN 2003hm (IAUC 8185)
is of type Ia, about 2 months past maximum brightness. Supernovae
2003he (IAUC 8182) and 2003hp (IAUC 8188) show some broad
undulations and are probably supernovae at respective redshifts of
0.025 and 0.051 (determined from narrow H_alpha emission in the
host galaxy nuclei), though of uncertain types because their
spectra are noisy; the former has a very red continuum, while the
latter is reasonably blue. SN 2003hf (IAUC 8182) might be of type
II, exhibiting a featureless blue continuum, but such
characteristics are rare for a type-II supernova as old as SN
2003hf (at least 2 weeks past the explosion).
(C) Copyright 2003 CBAT
2003 August 29 (8189) Daniel W. E. Green
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