Подборка интересных сообщений о комете и ее компанентах.
Circular No. 8659
>
> 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)
>
>
> COMET 73P/SCHWASSMANN-WACHMANN
>
> J. A. Farrell, Jemez Springs, NM, reports that unfiltered CCD
> exposures obtained with a 0.41-m f/8.4 reflector show a companion
> to comet 73P moving at the same general direction and rate as the
> primary; separations and position angles (+/- 0.02 deg) from the
> primary are as follows: Jan. 6.48831 UT, 1392".3 +/- 0".6 in p.a.
> 270.28 deg; 7.51252, 1414".4 +/- 0".8 in p.a. 269.90 deg; 9.39304
> (through high clouds), 1454".5 +/- 1".8 in p.a. 270.04 deg. On the
> first two nights, the magnitude of the primary was found to be
> 16.2-16.4, while the primary was at mag 18.8-19.0.
> Z. Sekanina, Jet Propulsion Laboratory, provides a search
> ephemeris for the companion discovered by Farrell. The few data
> points available can be reasonably well linked with the 1995-1996
> observations of nucleus B, but the final identification should wait
> for additional observations in coming weeks. The newly found
> companion is not identical with fragments A, E, or F observed
> between 1995 and 2001 (cf. Sekanina 2005, ICQ 27, 225-240; online
> at
http://cfa-www.harvard/edu/icq/sek_icq_V27_225.pdf ). The
> predicted separation distances from the main comet (in arcmin) and
> position angles (in degrees, for equinox J2000.0) are as follows:
> 2006 Jan. 15.0 TT, 29'.9, 297.9 deg; 25.0, 35'.4, 298.0 deg; Feb.
> 4.0, 42'.3, 297.9 deg; 14.0, 51'.3, 297.6 deg; 24.0, 63'.0, 297.2
> deg; Mar. 6.0, 78'.6, 296.5 deg.
>
>
> 2006 January 15 (8659) Daniel W. E. Green
>
>
> COMET 73P/SCHWASSMANN-WACHMANN
>
> J. A. Farrell corrects his separations and position angles as
> reported on IAUC 8659: Jan. 6.48831 UT, 1573".7 +/- 0".2 in p.a.
> 297.78 +/- 0.03 deg; 7.51252, 1598".9 +/- 0".6 in p.a. 297.80 +/-
> 0.03 deg; 9.39304 (through high clouds), 1644".8 +/- 1".3 in p.a.
> 297.83 +/- 0.05.
>
> 2006 January 17 (8660) Daniel W. E. Green
>
2006 January 24 (8663) Daniel W. E. Green
> COMET 73P/SCHWASSMANN-WACHMANN
>
> CCD observations of the secondary component to comet 73P (cf.
> IAUC 8659, 8660) obtained by R. Hill with the Catalina 0.68-m
> Schmidt telescope (60-s exposures) on Jan. 23.5 UT show a tail
> about 40" long in p.a. 290 deg. The available astrometry of this
> component, together with orbital elements (computed assuming
> identity with component B observed in 1995 and 1996, after Sekanina
> 2005, ICQ 27, 229) and an ephemeris, were published on MPEC
> 2006-B27.
>
> 2006 January 24 (8663) Daniel W. E. Green
>
060207
73Р-В:
What I have found strange, and I ask if someone has recent observations, it isthemagnitude of the fragment "B" of the comet 73P: in only 5 days is decreasedof 1,2 magnitudes, passing from 17,2 to 16,0!Best regardsRolando Ligustri
060209
73P-B can not survive this return?
Dear colleagues,The component B (or F by Sekanina's paper) is unexpectedly brighteningrapidly in early February. Now it is already bright as 16 mag. Thedifference form the main component C reduced down to only 2.0 mag. http://www.aerith.net/comet/catalog/0073P/2006.html It reminds me that 141P/Machholz 2 in 1999, when the component Dbrightened rapidly prior to the main component A, but unexpectedlydiminished before the perihelion passage.Zdenek Sekanina revealed in his paper: ICQ 27, 225-240 http://cfa-www.harvard.edu/icq/sek_icq_V27_225.pdf that four components were born from 73P. Two of them, A and originalB, were visible only in 1995 appearance and already vanished. Thecomponent E diminised before the perihelion passage in 2001, andprobably already vanished. The component B (or F) began to be observedin its previous appearance in 2001, and now only this survives.Is the current unexpected rapid brightening of the component B (or F)a sign that it can not survive this return and will vanish like theother components?Best regards,--Seiichi Yoshida
060211
Subject: 73P nucleus fragmentation tree
Dear colleagues,I read Sekanina's paper, Nakano Note and recent IAUCs and MPECs on thelink among fragments of 73P/Schwassmann-Wachmann 3.I found that some scenarios are proposed on the identification amongfragments observed in 1995 return (A, B), fragments observed in 2001return (B, E) and fragments observed in 2006 return (B).Here I show the nucleus fragmentation trees of the three scenarios: http://www.aerith.net/comet/catalog/0073P/index.html
Best regards,--Seiichi Yoshida
К вопросу о том, что мы можем ожидать увидеть во время максимального сближения:
060213
JBortle
Although one might anticipate the comet to display a huge coma at such close proximity to Earth, this was definitely not what was reported at the 1930 equally close approach. In fact, near perigee the reported coma diameter seems to have been only 3'-5'(!). Thus, it would appear that only the region immediately surrounding the nucleus was apparent by visual means.
