C/2012 T5 Bressi
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Comet C/2012 T5 was discovered on 14 October 2012 by Terry H. Bressi (Spacewatch), that is more than 4 months before its perihelion passage. It was observed until 21 March 2013 (see picture).
C/2012 T5 had its closest approach to the Earth on 25 February 2013 (0.913 au), a day after its perihelion passage.
Comet was lost a month after perihelion passage and Sekanina (2019) concluded that this Oort Cloud comet did not survive the observed perihelion passage.
Original value of 1/a is significantly negative for solutions based on entire data set. The preferred solution (based on pre-perihelion data taken at larger heliocentric distances than 1.33au) gives also negative value of original 1/a; however, within its uncertainty of about 1.5 sigma this comet can came from the Oort Cloud.
See also Królikowska 2020.
C/2012 T5 had its closest approach to the Earth on 25 February 2013 (0.913 au), a day after its perihelion passage.
Comet was lost a month after perihelion passage and Sekanina (2019) concluded that this Oort Cloud comet did not survive the observed perihelion passage.
Original value of 1/a is significantly negative for solutions based on entire data set. The preferred solution (based on pre-perihelion data taken at larger heliocentric distances than 1.33au) gives also negative value of original 1/a; however, within its uncertainty of about 1.5 sigma this comet can came from the Oort Cloud.
See also Królikowska 2020.
| solution description | ||
|---|---|---|
| number of observations | 702 | |
| data interval | 2012 10 14 – 2013 03 21 | |
| data type | significantly more measurements before perihelion (PRE+) | |
| data arc selection | entire data set (STD) | |
| range of heliocentric distances | 2.58 au – 0.32 au (perihelion) – 0.75 au | |
| type of model of motion | NT - non-gravitational orbits for asymmetric, standard g(r) | |
| data weighting | YES | |
| number of residuals | 1398 | |
| RMS [arcseconds] | 0.72 | |
| orbit quality class | 2a | |
| orbital elements (heliocentric ecliptic J2000) | ||
|---|---|---|
| Epoch | 2013 03 09 | |
| perihelion date | 2013 02 24.05790817 | ± 0.00021174 |
| perihelion distance [au] | 0.32274588 | ± 0.00000758 |
| eccentricity | 1.00021673 | ± 0.00002655 |
| argument of perihelion [°] | 318.084386 | ± 0.000977 |
| ascending node [°] | 230.587587 | ± 0.001692 |
| inclination [°] | 72.089306 | ± 0.001149 |
| reciprocal semi-major axis [10-6 au-1] | -671.52 | ± 82.26 |
Time distribution of positional observations with corresponding heliocentric (red curve) and geocentric (green curve) distance at which they were taken. The horizontal dotted line shows the perihelion distance for a given comet whereas vertical dotted line — the moment of perihelion passage.
| non-gravitational parameters | ||
|---|---|---|
| A1 [10-8au/day2] | 5.5764 | ± 0.6389 |
| A2 [10-8au/day2] | -1.3717 | ± 0.2233 |
| A3 [10-8au/day2] | 4.0893 | ± 0.4864 |
| m | -2.15 | |
| n | 5.093 | |
| k | -4.6142 | |
| r0 [au] | 2.808 | |
| α | 0.1113 | |
| ΔT [days] | 9.6184 | ± 2.4674 |