Общие вопросы астрономии > Новости наблюдательной астрономии
Возвращение кометы 73P/SCHWASSMANN-WACHMANN!!!
ctac:
Возможно данный блеск определяется вспышечной активностью...
Значит можно ожидать и падения блеска...
9382
From: Seiichi Yoshida <comet@...>
Date: Thu Mar 2, 2006 5:47pm
Subject: Re: 73P-G
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Dear colleagues,Nakano and some other Japanese calculators succeeded to link therecent observations of component G with the component E in 2001.If the component G is actually E in 2001, it is about 3-4 mag fainterthan 2001.
http://www.aerith.net/comet/catalog/0073P/2006.html Kadota reported it was fainter than 19 mag on Feb. 9.73, but bright as 18.1 mag on Feb. 13.78. Maybe it brightened rapidly in a short time.The light curve of the component E was unusual in 2001. It fadedbefore the perihelion passage. So the future brightness evolution isvery uncertain.Best regards,--Seiichi Yoshida http://www.aerith.net/
ctac:
27 February 2006
IAU Circular No.8679
COMET 73P/SCHWASSMANN-WACHMANN
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Another companion to comet 73P (cf. IAUC 8659, 8663) has been
found by R. A. Tucker (Tucson, AZ, 0.35-m reflector, on Feb. 20.4
and 22.4 UT) and E. J. Christensen (at mag 17.2 with a 15" coma and
a fanlike tail approximately 20" long in p.a. 250-310 deg on Mt.
Lemmon Survey images taken on Feb. 24.5, with additional images
also acquired on Feb. 25.5), denoted component 'G' on MPEC 2006-D47.
Z. Sekanina, Jet Propulsion Laboratory, notes that this companion
is not likely to be 'E' or 'F'. The positions of component 'G' are
consistent with the orbit for component 'B' (cf. MPEC 2006-B27, MPC
55982) but with T = 2006 June 8.11 TT ('B' has T = June 7.94, and
'C' has T = June 6.95; cf. MPC 55524).
1 March 2006
IAU Circular No.8681
COMET 73P/SCHWASSMANN-WACHMANN
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D. Schleicher, Lowell Observatory, obtained narrowband
photometry of comet 73P on Feb. 25 at r = 1.65 AU using the Hall
1.1-m telescope at Lowell Observatory, with the following averaged
results for component C: log Q(OH) = 27.30; equivalent log Q(water;
vectorial) = 27.33; log Q(CN) = 24.89; log Q(C_2) = 24.01; log
Af(rho) = 1.7 (cf. IAUC 7342). For component B: log Q(OH) = 26.8;
loq Q(water) = 26.8; log Af(rho) = 1.1. The relative C_2-to-CN
ratio for component C is strongly depleted (by 10 times) with
respect to "normal", as defined by A'Hearn et al. (1995, Icarus 118,
223) -- consistent with the upper-limit result for 73P determined
by Fink and Hicks (1996, Ap.J. 459, 729). To within relatively
large uncertainties, component B exhibits the same depletion of C_2
as does component C.
ched:
Элементы орбиты 73P-G:
http://www9.ocn.ne.jp/~comet/eph/0073pg.html
ched:
Все семь компонентов:
http://www.aerith.net/comet/catalog/0073P/2006.html
ctac:
--------------------------------------------------------------------------------
COMET 73P/SCHWASSMANN-WACHMANN
--------------------------------------------------------------------------------
E. J. Christensen, Lunar and Planetary Laboratory, writes that
four co-added unfiltered 150-s images obtained with the Mt. Lemmon
1.5-m reflector on Mar. 5.4 UT by R. E. Hill -- who was following
up a new fragment of comet 73P found by R. Kowalski from Mar. 4.4
images -- show four additional fragments, all lying along an
extension of the arc from component 'B' to component 'G' (p.a.
approximately 300 deg), and bringing the number of currently
observed components to seven (cf. IAUC 8679). Kowalski's fragment,
designated component 'H', has mag 20.0 and trails fragment 'G' by
approximately 875" (corresponding to T = 2006 June 8.29 TT); it
displays a diffuse 4" coma with no central condensation, slightly
elongated toward p.a. 275 deg. Component 'J', which had been noted
by Hill as cometary, trails component 'G' by approximately 170" (T
= June 8.14), and displays a diffuse 8" coma of mag 19.8 with a
very slight central condensation and a 10" tail toward p.a. 275 deg;
90-s images taken by Christensen on Feb. 24 showed nothing at the
presumed location of 'J'. Component 'K' (at mag 21.7) lies
approximately 611" from fragment 'G' (T = June 8.24) and shows a
diffuse 4" coma with neither central condensation nor tail.
Component 'L' lies approximately 1145" from fragment 'G' (T = June
8.35) and displays a slightly condensed 5" coma of mag 19.8 with a
7" tail toward p.a. 275 deg. For comparison, components 'B' and 'G'
were of mag 14.5 and 17.3, respectively, on Mar. 5.4 (all the Mt.
Lemmon magnitudes being calibrated to V). Christensen searched the
line of variation on the Mar. 5 images, out to 3500" from fragment
'G', but could find no other fragments (limiting mag V
approximately 22.0). Inspection of Kowalski's 120-s images from
Mar. 4 yields no trace of fragments 'J', 'K', and 'L' -- although
the area that should contain these fragments was unfortunately
affected by reflections from a nearby bright star. Four 150-s
unfiltered images taken on Mar. 6.5 show no significant changes in
the morphologies of any of the fragments since the previous night,
and no additional fragments were detected along the line of
variation out to approximately 2880" west-northwest of component 'B'
and to approximately 1580" east-southeast of component 'B'
(limiting mag V approximately 22.0). The new astrometry is
published on MPEC 2006-E32.
Visual total-magnitude estimates of component 'C': Feb. 27.68
UT, 12.3 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector); 28.19,
12.8 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector); Mar. 2.90,
11.7 (A. Baransky, Pylypovychi, Ukraine, 0.36-m reflector); 5.61,
12.1 (Yoshida); 6.32, 11.3 (W. Robledo, Cordoba, Argentina, 0.20-m
reflector); 8.19, 11.9 (Gonzalez). Visual total-magnitude
estimates of component 'B': Feb. 27.68, 14.4 (Yoshida); Mar. 8.20,
13.7 (Gonzalez).
2006 March 8 (8685)
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