271P/van Houten–Lemmon
Periodic comet
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271P/van Houten–Lemmon (previously P/1960 S1 and P/2012 TB36) is a short-period comet discovered in 1966 by Cornelis Johannes van Houten and Ingrid van Houten-Groeneveld on eight Palomar plates taken by Tom Gehrels between 24 September and 26 October 1960 as a hazy object of 17th magnitude. It was considered lost and designated D/1960 S1 until recovered by the Mount Lemmon Survey on 17 September 2012.[4]
Discoverydate24–26 October 1966
D/1960 S1
P/2012 TB36
P/2012 TB36
| Discovery | |
|---|---|
| Discovered by | Cornelius J. van Houten Ingrid G. van Houten |
| Discovery site | Palomar Observatory |
| Discovery date | 24–26 October 1966 |
| Designations | |
| D/1960 S1 P/2012 TB36 | |
| 1961 X | |
| Orbital characteristics[1][2] | |
| Epoch | 7 July 2013 (JD 2456480.5) |
| Observation arc | 54.32 years |
| Number of observations | 96 |
| Aphelion | 9.714 AU |
| Perihelion | 4.249 AU |
| Semi-major axis | 6.982 AU |
| Eccentricity | 0.39135 |
| Orbital period | 18.447 yr |
| Inclination | 6.855° |
| 9.584° | |
| Argument of periapsis | 35.135° |
| Mean anomaly | 0.063° |
| Last perihelion | 5 July 2013 |
| Next perihelion | 22 March 2032 |
| TJupiter | 2.862 |
| Earth MOID | 3.262 AU |
| Jupiter MOID | 0.149 AU |
| Physical characteristics[1][3] | |
Mean radius | 14.8 km (9.2 mi) |
| Comet total magnitude (M1) | 7.2 |
| Comet nuclear magnitude (M2) | 14.1 |
