Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 8686: S/2005 P 1, S/2005 P 2; 2006aq, 2006ar,, 2006as; C/2006 A1

The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).

Read IAUC 8685 SEARCH Read IAUC 8687

View IAUC 8686 in .dvi, .ps or .PDF format.
IAUC number 

                                                  Circular No. 8686
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)


S/2005 P 1 AND S/2005 P 2
     S. A. Stern, Southwest Research Institute (SwRI); H. A.
Weaver, Applied Physics Laboratory, Johns Hopkins University; M. J.
Mutchler, Space Telescope Science Institute; A. J. Steffl, W. J.
Merline, and J. R. Spencer, SwRI; M. W. Buie, Lowell Observatory;
and E. F. Young and L. A. Young, SwRI, report color observations of
the newly discovered small satellites of Pluto (cf. IAUC 8625, 8676)
using the Hubble Space Telescope (+ ACS/HRC) on Mar. 2.75 UT.
During these observations, S/2005 P 1 was at an average position of
2".69 from the photo-center of Pluto at p.a. 138 deg, and S/2005 P
2 was 1".43 away at p.a. 214 deg.  Using ACS filters F606W and
F435W, and adopting for Pluto I (Charon) the value B-V = +0.710
(Buie et al. 1997, Icarus 125, 233), B-V colors +0.653 +/- 0.026
and +0.654 +/- 0.065 were found for S/2005 P 1 and S/2005 P 2,
respectively.  These colors indicate that the observed hemispheres
of all three of Pluto's satellites are essentially neutral, with
only minor differences among them, as might be expected for bodies
having a similar origin and sharing a similar environment.  Given
that a much redder color of B-V = +0.91 +/- 0.15 was reported for
S/2005 P 2 (Buie et al. 2006,
http://xxx.lanl.gov/abs/astro-ph/?0512491), additional
observations are solicited.


SUPERNOVAE 2006aq, 2006ar, AND 2006as
     CBET 423 contains details of a type-Ia supernova (mag
approximately 19.9, calibrated to R) discovered by the "Nearby
Supernova Factory" collaboration on NEAT images taken on Feb. 24.5
UT:  SN 2006as is located at R.A. = 13h51m24s.88, Decl. =
-11o15'26".8 (equinox 2000.0).  They also obtained spectra (range
320-1000 nm) of supernovae 2006aq and 2006ar (cf. IAUC 8684) on
Mar. 7.6 and 7.5 UT, respectively; 2006aq is a type-II event that
appears to have faded rapidly relative to the reported discovery
magnitude.  Type-Ia supernova 2006ar is before or near maximum.


COMET C/2006 A1 (POJMANSKI)
     Visual total-magnitude estimates:  Feb. 11.34 UT, 6.2 (L. A.
Mansilla, Rosario, Argentina, 7x50 binoculars); 27.32, 5.2 (W.
Souza, Mairipora, Brazil, naked eye); Mar. 3.83, 5.1 (K. Yoshimoto,
Yamaguchi, Japan, 7x35 binoc.); 8.21, 5.4 (J. J. Gonzalez, Leon,
Spain, 7x50 binoc.; 2.5-deg tail in p.a. 285 deg); 9.20, 5.8 (A.
Baransky, Pylypovychi, Ukraine, 10x50 binoculars).

                      (C) Copyright 2006 CBAT
2006 March 9                   (8686)            Daniel W. E. Green

Read IAUC 8685 SEARCH Read IAUC 8687

View IAUC 8686 in .dvi, .ps or .PDF format.

Our Web policy. Index to the CBAT/MPC/ICQ pages.

Valid HTML 4.01!