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Post Info TOPIC: Comet 2008 R1 (Garradd)
Blobrana


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Comet 259P/Garradd
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Comet 259P/Garradd is at Opposition (0.872 AU) on the 26th July 2017



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Blobrana


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RE: Comet 2008 R1 (Garradd)
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Comet 259P/Garradd is at Opposition (1.635 AU) on the 15th November 2013

Ephemeris

Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase   Mag
2013 11 15    03 18 57.5 +18 29 25   1.6354  2.6245   179.6     0.2  20.8
2013 11 16    03 17 46.3 +18 30 57   1.6395  2.6282   178.3     0.6  20.8
2013 11 17    03 16 35.6 +18 32 28   1.6439  2.6318   177.0     1.1  20.8
2013 11 18    03 15 25.4 +18 33 56   1.6487  2.6355   175.8     1.6  20.8
2013 11 19    03 14 15.8 +18 35 22   1.6537  2.6392   174.5     2.1  20.8
2013 11 20    03 13 06.8 +18 36 47   1.6590  2.6428   173.2     2.5  20.8
2013 11 21    03 11 58.6 +18 38 11   1.6646  2.6465   172.0     3.0  20.8
2013 11 22    03 10 51.1 +18 39 33   1.6706  2.6501   170.7     3.5  20.8
2013 11 23    03 09 44.5 +18 40 55   1.6768  2.6537   169.4     3.9  20.9
2013 11 24    03 08 38.8 +18 42 15   1.6833  2.6574   168.2     4.4  20.9
2013 11 25    03 07 34.1 +18 43 35   1.6900  2.6610   166.9     4.8  20.9
2013 11 26    03 06 30.5 +18 44 54   1.6971  2.6646   165.7     5.3  20.9
2013 11 27    03 05 27.9 +18 46 13   1.7045  2.6683   164.4     5.7  20.9
2013 11 28    03 04 26.5 +18 47 31   1.7121  2.6719   163.2     6.1  20.9
2013 11 29    03 03 26.3 +18 48 50   1.7200  2.6755   162.0     6.6  21.0
2013 11 30    03 02 27.5 +18 50 09   1.7282  2.6791   160.7     7.0  21.0


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Blobrana


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Date:
259P/Garradd
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Comet 259P/Garradd makes its closest approach to the Earth (1.609 AU) on the 1st November, 2013.



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Blobrana


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RE: Comet 259P/Garradd
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Comet 259P/Garradd is at Perihelion (1.798 AU) on the 25th January, 2013



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Ephemeris

Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase  Mag
2013 01 24    20 45 03.1 -28 23 14   2.7581  1.7977    10.2     5.6  20.3
2013 01 25    20 48 00.5 -28 13 34   2.7584  1.7977    10.1     5.5  20.3
2013 01 26    20 50 57.5 -28 03 43   2.7586  1.7977    10.1     5.5  20.3
2013 01 27    20 53 54.0 -27 53 40   2.7589  1.7977    10.1     5.5  20.3
2013 01 28    20 56 50.0 -27 43 28   2.7591  1.7978    10.1     5.5  20.3
2013 01 29    20 59 45.5 -27 33 04   2.7594  1.7979    10.1     5.5  20.3
2013 01 30    21 02 40.5 -27 22 30   2.7596  1.7980    10.1     5.5  20.3
2013 01 31    21 05 35.0 -27 11 45   2.7598  1.7982    10.1     5.5  20.3


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Blobrana


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RE: Comet 2008 R1 (Garradd)
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Title: Faint moving object detection, and the Low Signal-to-Noise recovery of Main Belt comet P/2008 R1 Garradd
Authors: Jan Kleyna, Karen J. Meech, Olivier Hainaut

We describe the recovery of faint Main Belt comet P/2008 R1 Garradd using several telescopes, culminating in a successful low S/N recovery with the Gemini North telescope with GMOS. This recovery was a time-critical effort for a mission proposal, and had to be performed in a crowded field. We describe techniques and software tools for eliminating systematic noise artifacts and stellar residuals, bringing the final detection image statistics close to the Gaussian ideal for a median image stack, and achieving a detection sensitivity close to this theoretical optimum. The magnitude of R_c=26.1±0.2 with an assumed geometric albedo of 0.05 corresponds to a radius of 0.3 km. For ice to have survived in this object over the age of the solar system, it implies that the object is a more recent collisional fragment. We discuss the implications of the unexpectedly faint magnitude and nuclear size of P/2008 R1 on the survival of ice inside very small bodies.

Read more (1343kb, PDF)



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Comet 259P/Garradd
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Title: The Nucleus of Main-Belt Comet 259P/Garradd
Authors: Eric MacLennan, Henry Hsieh

We present observations of the main-belt comet 259P/Garradd, previously known as P/2008 R1 (Garradd), obtained in 2011 and 2012 using the Gemini North Telescope on Mauna Kea in Hawaii, and the SOAR Telescope at Cerro Pachon in Chile, with the goal of computing the object's phase function and nucleus size. We find an absolute magnitude of H_R=19.71±0.05 mag and slope parameter of G_R=-0.08±0.05 for the inactive nucleus, corresponding to an effective nucleus radius of r_e=0.30±0.02 km, assuming an R-band albedo of p_R=0.05. We also revisit observations reported for 259P while it was active in 2008 to quantify the dust mass loss and compare the object with other known main-belt comets.

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RE: Comet 2008 R1 (Garradd)
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Orbital elements:
    P/2008 R1 (Garradd)
Epoch 2013 Jan. 28.0 TT = JDT 2456320.5
T 2013 Jan. 25.43382 TT                                 MPC
q   1.7976845            (2000.0)            P               Q
n   0.21877172     Peri.  256.55895     +0.59348670     +0.77538649
a   2.7277753      Node    51.96117     -0.59081218     +0.60175378
e   0.3409705      Incl.   15.89883     -0.54654781     +0.19148939
P   4.51
From 38 observations 2008 July 15-2012 Apr. 15

MPEC 2012 - K41



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Comet P/2008 R1 (Garradd) makes its closest approach to the Earth (1.560 AU) on the 3rd May, 2012.



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Blobrana


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Posts: 131433
Date:
Comet P/2008 R1 (Garradd)
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MPEC 2008-S46

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