2009A&A...502..355M


Query : 2009A&A...502..355M

2009A&A...502..355M - Astronomy and Astrophysics, volume 502, 355-365 (2009/7-4)

The distant activity of the long period comets C/2003 O1 (LINEAR) and C/2004 K1 (Catalina).

MAZZOTTA EPIFANI E., PALUMBO P., CAPRIA M.T., CREMONESE G., FULLE M. and COLANGELI L.

Abstract (from CDS):

We study the distant dust environment of two Long Period Comets: C/2003 O1 (LINEAR) (observed at rh=7.39AU) and C/2004 K1 (Catalina) (observed at rh=3.43AU). The case of C/2003 O1 is particularly interesting since the comet has a quite large perihelion heliocentric distance (rh=6.85AU). We analysed R-band images taken at the CAHA 2.2m telescope to characterise the properties of the cometary dust coma. The images of both comets were also used as input into an inverse numerical model, to derive information about the dynamical parameters of coma dust grains until a time ∼500 days before the observation. Both the comets appeared to be active, and of similar shape and size despite the great difference in their heliocentric distance of observation. C/2003 O1 exhibited a tail extending to at least 3.7x105km. It is a very active object, since its Afρ is 552±36cm within the inner 5''. C/2004 K1 showed a similar long tail, extending to 2.6x105 km. Its Afρ is 539±35cm within the inner 5''. An almost constant dust grain ejection velocity between 0.5 and 0.9m/s at 1cm dust size has been derived for C/2003 O1 and an increase from 0.5 to 2m/s at 1 cm dust size for C/2004 K1, reflecting the different volatile dragging the dust environment (probably CO for C/2003 O1 and water for C/2004 K1). Model results allow some speculations about the comet nucleus size of C/2003 O1 (LINEAR) and its CO content: for a QCO similar in value to those observed for other distant cometary objects, a comet radius Rn from 13 to 17km can be inferred.

Abstract Copyright:

Journal keyword(s): comets: individual: glutag{Viz.comet "C/2003 O1 " |C/2003 O1 (LINEAR)} and glutag{Viz.comet "C/2004 K1 " | C/2004 K1 (Catalina)} - comets: general

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 GSC 04949-00650 * 12 43 14.2073663640 -00 33 20.567053440 14.472 14.307 13.634 13.251 12.898 ~ 6 0
2 PG 1530+057 HS* 15 33 10.7388809784 +05 32 26.849612508 13.573 14.362 14.211 14.049 14.012 sdB 18 0
3 PG 1633+099 HS* 16 35 24.0241690848 +09 47 49.891209036 13.215 14.205 14.396 14.481 14.609 sdB 108 0

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2023.02.09-10:54:26

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