Solar and Heliospheric Observatory/Solar Wind Anisotropies Observations of Five Moderately Bright Comets: 1999-2002

Combi, M. R.; Mäkinen, Jaakko; Henry, N. J.; Bertaux, Jean-Loup; Quémerais, Éric

doi:10.1088/0004-6256/135/4/1533

Cited by 14 publications

(21 citation statements)

References 40 publications

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“…a steeper slope than −2.3 or one flatter than −2.0 already gave a noticeably poorer fit. This result is also qualitatively consistent with Combi et al (2009), who -according to the productionrate power-law slope classification of Combi et al (2008) -include C/2002 T7 in the moderate slope group. However, all models tested here indicate that this comet was outside the orbit of Uranus in the previous perihelion passage ∼8-14 million years ago.…”

Section: Discussionsupporting

confidence: 89%

Different dynamical histories for comets C/2001 Q4 and C/2002 T7?

Królikowska

Dybczyński

Sitarski

2012

A&A

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Context. Both, C/2001 Q4 and C/2002 T7, are widely regarded in the literature as dynamically new comets that are visiting our planetary system for the first time from the Oort Cloud. Aims. We study the past dynamical evolution of these two bright comets that both have an original semimajor axis inside the so-called Oort spike (i.e. with 1/a ori < 10 −4 AU −1 ). Methods. For each comet, we constructed a dedicated grid of independent, starting, osculating swarms of 5000 orbits based on different subsets of positional data and different dependences of the non-gravitational acceleration on the heliocentric distance. We then followed numerically each swarm of non-gravitational orbits one orbital revolution into the past, taking into account both planetary and Galactic perturbations and checking for all known stellar perturbers. This method allows us to obtain the orbital elements and their uncertainties at the previous perihelion passage. Results. We find that the dedicated g(r)-like function seems to be more adequate for describing the non-gravitational effects than the standard g(r)-function in the motion of both comets, but we are able to estimate only two parameters: the scale distance r 0 , and the exponent m. We show, however, that the greatest change in the previous perihelion value relative to that obtained in the standard approach results from the type of data subset used for non-gravitational orbit determination. The form of the dependence of nongravitational acceleration on heliocentric distance is of secondary importance for both investigated comets in this context. We find that only comet C/2002 T7 passed far beyond the planetary system during its previous perihelion passage and that C/2001 Q4 was probably well inside the Saturn orbit at a previous perihelion. Conclusions. We argue that for these comets (which have long sequences of positional data), the safest method for the previous perihelion determination is to exclude data within time intervals where some local outbursts were reported. We recommend that the non-gravitational models based on data taken at larger perihelion distance are more appropriate for estimating the distance of previous perihelion passage of C/2001 Q4 and those based on a pre-perihelion data set for previous perihelion estimation of C/2002 T7. These models suggest that C/2001 Q4 passed its previous perihelion closer than 6-7 AU from the Sun, so is dynamically old, whereas C/2002 T7 at a distance larger than 400 AU, is a dynamically new comet since it overcame the Jupiter-Saturn barrier.

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Section: Discussionsupporting

confidence: 89%

Different dynamical histories for comets C/2001 Q4 and C/2002 T7?

Królikowska

Dybczyński

Sitarski

2012

A&A

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“…Furthermore, we have developed a method of simultaneously analyzing sets of SWAN images, usually recorded a few times per week, to extract daily average values of the water production rate by the nucleus . Using the extracted daily-average values we have compared with various complementary data sets (Combi et al , 2008 and found reasonable agreement with both long-term and short-term variations of the cometary water production, including large outbursts.…”

Section: Introductionmentioning

confidence: 63%

“…This range of differences in consistency is similar to those found between SWAN results and other methodologies (water in the IR, OH in near UV and radio, etc.) in the SWAN results for the five moderately bright comets from 1999 to 2001 (Combi et al 2008). 3.…”

Section: Introductionmentioning

confidence: 96%

“…Using this procedure we were able to analyze a large set of Lyα images of comet 1996 B2 Hyakutake and resolve three major outbursts including the well-known 1996 March 19 outburst. We have since used the TRM for several other comets for both single-image production rates (Mäkinen et al 2007;Neugebauer et al 2007) and daily averages (Combi et al 2008).…”

Section: Introductionmentioning

confidence: 99%

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WATER PRODUCTION IN COMETS 2001 Q4 (NEAT) AND 2002 T7 (LINEAR) DETERMINED FROMSOHO/SWAN OBSERVATIONS

Combi¹,

Mäkinen²,

Bertaux³

et al. 2009

The Astronomical Journal

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“…The power-law fits are Q = 1.3 × 10 29 r −1.3 in s −1 and Q = 5.0 × 10 28 r −2.3 in s −1 for the pre-perihelion and post-perihelion periods, respectively, where r is the heliocentric distance. Such behavior, with a fairly shallow slope before perihelion and a steeper slope after perihelion, is often seen in new comets coming on their first trip back into the inner solar system directly from the Oort Cloud since they were formed 4.5 Gyr ago and ejected into the Oort Cloud by the giant planets (A'Hearn et al 1995;Combi et al 2008Combi et al , 2009). The behavior of 2011 L4 (PanSTARRS) is actually quite Combi et al (2009).…”

Section: Introductionmentioning

confidence: 97%