475P/Spacewatch–LINEAR
| Discovery[1] | |
|---|---|
| Discovered by | Spacewatch LINEAR |
| Discovery date | 17 February 2004 |
| Designations | |
| P/2004 DO29 P/2023 V7 | |
| Orbital characteristics[2][3] | |
| Epoch | 21 November 2025 (JD 2461000.5) |
| Observation arc | 21.35 years[a] |
| Earliest precovery date | 11 February 2004[4] |
| Number of observations | 164 |
| Aphelion | 10.563 AU |
| Perihelion | 4.077 AU |
| Semi-major axis | 7.320 AU |
| Eccentricity | 0.44302 |
| Orbital period | 19.806 years |
| Inclination | 14.524° |
| 147.35° | |
| Argument of periapsis | 40.424° |
| Mean anomaly | 26.734° |
| Last perihelion | 1 June 2024 |
| Next perihelion | ~2043 |
| TJupiter | 2.772 |
| Earth MOID | 3.107 AU |
| Jupiter MOID | 0.657 AU |
| Physical characteristics[2] | |
Mean radius | 1.07 ± 0.09 km (0.665 ± 0.056 mi)[5] |
Mean density | 640±100 kg/m3[5] |
| Comet total magnitude (M1) | 7.0 |
| Comet nuclear magnitude (M2) | 13.7 |
Comet Spacewatch–LINEAR, also known as 475P/Spacewatch–LINEAR, is a distant Jupiter-family comet with a roughly 20-year orbit around the Sun. It is one of several comets discovered by the Spacewatch and Lincoln Near-Earth Asteroid Research (LINEAR) surveys.
Observational history
[edit]An apparently asteroid-like object both discovered by Spacewatch and LINEAR in 17 February 2004 was later found to have cometary activity after a 5 arcsecond-wide coma was detected upon review of photographic plates on 16 March 2004.[1] Precovery images as early as 11 February 2004 were known.[4] Observations conducted at the Galileo National Telescope in spring 2005 showed a well-developed coma and long tail even as the comet is well on its outbound trajectory at a distance of 4.22 AU (631 million km) from the Sun.[6]
The comet was accidentally recovered from images taken by Pan-STARRS on 25 November 2023,[7] with additional independent observations from the Calar Alto Observatory and Tenerife Observatory were also reported.[8] It later received its official numerical designation (475P) alongside ten other periodic comets on April 2024.[9]
Notes
[edit]- ↑ Observation arc from the Minor Planet Center database covering dates from 11 February 2004 until 19 June 2025.
References
[edit]- 1 2 S. S. Sheppard; Y. R. Fernandez; D. C. Jewitt (16 March 2004). D. W. Green (ed.). "Comet P/2004 DO29 (Spacewatch–LINEAR)". IAU Circular. 8305 (1). Bibcode:2004IAUC.8305....1S.
- 1 2 "475P/Spacewatch–LINEAR – JPL Small-Body Database Lookup". ssd.jpl.nasa.gov. Jet Propulsion Laboratory. Retrieved 14 September 2026.
- ↑ "475P/Spacewatch–LINEAR Orbit". Minor Planet Center. Retrieved 14 September 2026.
- 1 2 S. S. Sheppard; Y. R. Fernandez; D. C. Jewitt; et al. (16 March 2004). B. G. Marsden (ed.). "Comet P/2004 DO29 (Spacewatch–LINEAR)". Minor Planet Electronic Circular. 2004-F09. Bibcode:2004MPEC....F...09S. ISSN 1523-6714.
- 1 2 M. L. Paradowski (2022). "A New Indirect Method of Determining Density of Cometary Nuclei" (PDF). Acta Astronomica. 72 (2): 141–159. Bibcode:2022AcA....72..141P. doi:10.32023/0001-5237/72.2.4. ISSN 0001-5237.
- ↑ E. M. Epifani; P. Palumbo; M. T. Capria; et al. (2008). "The distant activity of Short Period Comets*– II". Monthly Notices of the Royal Astronomical Society. 390 (1): 265–280. Bibcode:2008MNRAS.390..265M. doi:10.1111/j.1365-2966.2008.13718.x.
- ↑ M. Micheli; F. Ocaña; R. Kresken; et al. (22 January 2024). "Comet P/2004 DO29 = P/2023 V7 (Spacewatch–LINEAR)". Minor Planet Electronic Circular. 2024-B93. Bibcode:2004MPEC....F...09S. doi:10.48377/MPEC/2024-B93. ISSN 1523-6714.
- ↑ R. Weryk; M. Rudenko; M. Micheli; et al. (23 January 2024). D. W. Green (ed.). "Comet P/2023 V7 = P/2004 DO29 (Spacewatch–LINEAR)". Central Bureau Electronic Telegrams. 5335: 1. Bibcode:2024CBET.5335....1W.
- ↑ S. Deen (22 April 2024). D. W. Green (ed.). "New Numberings of Short-Period Comets". Central Bureau Electronic Telegrams. 5386: 1. Bibcode:2024CBET.5386....1D.
External links
[edit]- 475P/Spacewatch–LINEAR at the JPL Small-Body Database
- 475P/Spacewatch–LINEAR at the Minor Planet Center database
- 475P/Spacewatch–LINEAR at Seiichi Yoshida's website
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