Документ взят из кэша поисковой машины. Адрес
оригинального документа
: http://star.arm.ac.uk/nibulletin/2005/Jul-30.html
Дата изменения: Mon Aug 1 13:05:49 2005 Дата индексирования: Tue Oct 2 04:07:09 2012 Кодировка: |
![]()
From: TerryMoselaol.com Date: Sat, 30 Jul 2005 21:22:03 EDT Subject: New Planet + EKBO's; RADIO; Lecture, SHUTTLE Hi all, 1. 'The New Planet', etc: The following info, kindly forwarded by Prof Mark Bailey, should help to clear up any confusion resulting from the recent discovery of THREE large EKBO's (Edgeworth-Kuiper Belt Objects), also known as TNO's (Trans-Neptunian Objects), or if they are large, they're sometimes called 'Plutinos'. BTW, some people have congratulated me for 'scooping' the official email newsflash announcements by NASA, Astronomy Now / Spaceflight Now, the BAA, and even New Scientist which got its first report slightly confused! I have to say that my quick announcement was entirely due to the prompt emails and T/C from Prof Alan Fitzsimmons! To summarize: The largest one, "2003 UB_313", reported by M. E. Brown, C. A. Trujillo, and D. Rabinowitz, using the Palomar 1.2-m Schmidt telescope (+ Quest camera), is believed to be bigger, and intrinsically brighter, than Pluto, and is therefore being called 'The Tenth Planet'. 2003 UB_313, currently at a distance of 97 AU (Astronomical Units - an AU is the mean Earth-Sun distance: about 150 million km, or 93 million miles) from the Sun, and a magnitude in red light of 18.5, has absolute magnitude H = -1.1 (Pluto has H = -1.0). The orbital period (its 'year') is 557 years. The following details from the IAU, forwarded by Mark, give details of all three objects: .............................................................................. ............................................... Circular No. 8577 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 2003 EL_61, 2003 UB_313, AND 2005 FY_9 Three relatively bright transneptunian objects have been reported by M. E. Brown, C. A. Trujillo, and D. Rabinowitz using the Palomar 1.2-m Schmidt telescope (+ Quest camera). The object 2003 UB_313, currently at heliocentric distance r = 97 AU and red mag 18.5, has absolute magnitude H = -1.1 (Pluto has H = -1.0); observations, the following orbital elements (P = 557 yr), and an ephemeris appear on MPEC 2005-O41. Epoch = 2005 Aug. 18.0 TT T = 2257 Jan. 26.1837 TT Peri. = 151.3115 e = 0.441613 Node = 35.8750 2000.0 q = 37.808 AU Incl. = 44.1770 MPEC 2005-O42 contains observations, orbital elements (T = Sept. 2130, q = 38.7 AU, Peri. = 246 deg, Node = 79 deg, i = 29 deg, e = 0.15, P = 308 yr), and an ephemeris for 2005 FY_9 (which is currently at red mag 17). MPEC 2005-O36 contains astrometric observations for an object, designated 2003 EL_61, of red mag 17 first reported by P. Santos- Sanz, J. L. Ortiz, and F. J. Aceituno via three CCD frames taken in March 2003 with a 0.36-m Schmidt-Cassegrain reflector at the Sierra Nevada Observatory in Granada, Spain, with additional observations identified from images obtained at several different sites back to 1955. MPEC 2005-O36 also contains orbital elements (T = Dec. 2133, q = 35.2 AU, Peri. = 240 deg, Node = 122 deg, i = 28 deg, e = 0.19, P = 285 yr) and an ephemeris for 2003 EL_61. This object was also found by Brown et al. at Palomar on 2004 May 6 [Rabinowitz et al. 2005, Bull. A.A.S. 37(3), Abstr. 56.12], who also obtained observations at Keck Observatory during Jan.-June 2005 of a satellite with orbital period 49.1 days and semimajor axis approximately 49500 km, which indicate a total system mass approximately 29 percent that of the mass of the Pluto-Charon system [Bouchez et al. 2005, Bull. A.A.S. 37(3), Abstr. 56.02; Brown et al. 2005, Ap.J. Let., submitted]. COMET C/2005 N6 (SOHO) Another very faint and diffuse tailless Kreutz sungrazing comet has been found on SOHO images (cf. IAUC 8576; TC = T. Chen). Comet 2005 UT R.A.(2000)Decl. Inst. F MPEC C/2005 N6 July 6.354 6 54.1 +21 22 C2 TC 2005-O26 (C) Copyright 2005 CBAT 2005 July 29 (8577) Daniel W. E. Green" .............................................................................. .. It's a pity that 2003 UB_313 isn't near perihelion, rather than near aphelion: if it was, we could see it in good amateur telescopes! See also: info about 2003 EL61 and 2003 UB313 at www.gps.caltech.edu/~mbrown/planetlila .............................................................................. ............................................. 2. RADIO: Thu, 4 Aug, 4.30pm, BBC R4: 'The Material World' on the Perseid meteors. 3. LECTURE: Wed, 3 Aug, 6.00pm, Larkin Theatre, DCU: Prof. Anders Barany on 'Einstein's Nobel Prize'. The fascinating story behind the award. Booking: (01) 700-5382 or ncpst
dcu 4: The COLUMBIA Shuttle Mission: Watch the Shuttle on the Web at www.nasa.gov Clear skies, Terry Moseley
Last Revised: 2005 August 1st
WWW contact:webmaster@arm.ac.ukGo to HOME Page