Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.stsci.edu/~mutchler/documents/IAU_Circular_8686.pdf Дата изменения: Fri Mar 10 16:45:58 2006 Дата индексирования: Sat Dec 22 04:31:59 2007 Кодировка: Поисковые слова: astro-ph

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. 138o , and S/2005 P 2 was 1 .43 away at p.a. 214o . 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), B­V 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 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 = 13h 51m 24s .88, = -11o 15 26 .8 (equinox 2000.0). They also obtained spectra (range 320­1000 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, 7в50 binoculars); 27.32, 5.2 (W. Souza, Mairipora, Brazil, naked eye); Mar. 3.83, 5.1 (K. Yoshimoto, Yamaguchi, Japan, 7в35 .5 binoc.); 8.21, 5.4 (J. J. Gonzalez, Leon, Spain, 7в50 binoc.; 2o tail in p.a. 285o ); 9.20, 5.8 (A. Baransky, Pylypovychi, Ukraine, 10в50 binoculars). 2006 March 9 c Copyright
2006 CBAT

Daniel W. E. Green