217P/LINEAR is a periodic Jupiter-family comet with an orbital period of 7.83 years. It was discovered by LINEAR on 11 July 2001.[1]
 The comet on 18 August 2009 by the Palomar Transient Factory | |
| Discovery[1] | |
|---|---|
| Discovered by | LINEAR |
| Discovery date | July 11, 2001 |
| Designations | |
| P/2001 MD7, P/2009 F3 | |
| Orbital characteristics[3] | |
| Epoch | September 1, 2010 (2455440.5) |
| Aphelion | 6.665 AU |
| Perihelion | 1.224 AU |
| Semi-major axis | 3.944 AU |
| Eccentricity | 0.6896 |
| Orbital period | 7.834 a 2861.4 d |
| Inclination | 12.880° |
| 125.621° | |
| Argument of periapsis | 246.767° |
| Last perihelion | 16 July 2017[2] |
| Next perihelion | 24 May 2025[2] |
| TJupiter | 2.548 |
| Earth MOID | 0.308 AU |
| Comet total magnitude (M1) | 13.8[3] |
Upon discovery the comet was diffuse. It was later identified as an asteroidal object with an estimated magnitude of 17.6 detected on 21 and 24 June 2001, again by LINEAR, that had been named 2001 MD7. A preliminary orbit indicated an orbital period of 7.5 years.[1] The comet brightened up to an apparent magnitude of 12 from November 2001 to January 2002.[4]
The comet was recovered in images obtained remotely by Ernesto Guido, Giovanni Sostero, and Paul Camilleri in images obtained on 17 and 18 March 2009 with a remotely operated reflector telescope with an estimated apparent magnitude of around 18.2. The comet has a diffuse coma 15 arcseconds across.[5] In mid October, around 13.4 October, 34 days after perihelion, an outburst took place, during which the comet brightened by 1.7 – 2.3 magnitudes and an expanding dust cloud was observed. The estimated mass loss from the comet was estimated to be 106–109 kg, while no fragments were observed.[6]
The comet is a near-Earth object, with a minimum orbit intersection distance of 0.308 AU (46.1 million km). The comet will approach Earth to a distance of 0.396 AU on 7 September 2048. The comet also has close approaches to Mars, approaching to a distance of 0.1 AU on 12 November 1905 and an even closer approach will take place on April 1, 2056, when the comet will approach to a distance of 0.064 AU (9.6 million km).[3]
References
edit- ^ a b c Blythe, M.; Sarounova, L.; Marsden, B. G. (1 July 2001). "Comet P/2001 MD_7 (LINEAR)". International Astronomical Union Circular. 7660: 1. ISSN 0081-0304.
- ^ a b "217P/LINEAR". www.aerith.net. Retrieved 17 August 2024.
- ^ a b c "Small-Body Database Lookup: 217P/LINEAR". ssd.jpl.nasa.gov. Retrieved 20 July 2023.
- ^ Kronk, Gary. "C&MS: 217P/LINEAR". cometography.com. Retrieved 17 August 2024.
- ^ Guido, E.; Sostero, G.; Camilleri, P.; Marsden, B. G. (1 March 2009). "Comet P/2009 F3 (LINEAR)". International Astronomical Union Circular. 9031: 1. ISSN 0081-0304.
- ^ Sarugaku, Y.; Ishiguro, M.; Ueno, M.; Usui, F.; Watanabe, J. (20 November 2010). "OUTBURST OF COMET 217P/LINEAR". The Astrophysical Journal. 724 (1): L118–L121. doi:10.1088/2041-8205/724/1/L118.