8776_Campestris
8776 Campestris, provisional designation 2287 T-3, is a stony background asteroid from the central region of the asteroid belt, approximately 10 kilometers in diameter. It was discovered on 16 October 1977, by Dutch astronomer couple Ingrid and Cornelis van Houten at Leiden Observatory, and Dutch–American astronomer Tom Gehrels at the Palomar Observatory in California, United States.[8] The asteroid was named for the tawny pipit (Anthus campestris), a shorebird.[3]
| Discovery [1] | |
|---|---|
| Discovered by | C. J. van Houten I. van Houten T. Gehrels |
| Discovery site | Palomar Obs. |
| Discovery date | 16 October 1977 |
| Designations | |
| (8776) Campestris | |
| Pronunciation | /kæmˈpɛstrɪs/[2] |
Named after | Anthus campestris (the tawny pipit)[3] |
| 2287 T-3 · 1990 SO10 | |
| main-belt · (middle) [4] background | |
| Orbital characteristics [1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 38.98 yr (14,236 days) |
| Aphelion | 3.2415 AU |
| Perihelion | 2.1392 AU |
| 2.6904 AU | |
| Eccentricity | 0.2049 |
| 4.41 yr (1,612 days) | |
| 94.226° | |
| Inclination | 3.4400° |
| 300.27° | |
| 338.93° | |
| Physical characteristics | |
| Dimensions | 7.65 km (calculated)[4] 10.543±0.106 km[5][6] |
| 9.2982±0.0118 h[4] 9.2990±0.0064 h[7] | |
| 0.058±0.008[5][6] 0.10 (assumed)[4] | |
| S [4] | |
| 13.7[1][4] · 13.6[5] · 14.122±0.002 (S)[7] · 13.734±0.002 (R)[7] | |
Campestris is a non-family asteroid from the main belt's background population. It orbits the Sun in the central main-belt at a distance of 2.1–3.2 AU once every 4 years and 5 months (1,612 days). Its orbit has an eccentricity of 0.20 and an inclination of 3° with respect to the ecliptic.[1]
Survey designation
The survey designation "T-3" stands for the third Palomar–Leiden Trojan survey, named after the fruitful collaboration of the Palomar and Leiden Observatory in the 1960s and 1970s. Gehrels used Palomar's Samuel Oschin telescope (also known as the 48-inch Schmidt Telescope), and shipped the photographic plates to Cornelis and Ingrid van Houten-Groeneveld at Leiden Observatory where astrometry was carried out. The trio of astronomers are credited with the discovery of several thousand minor planets.[9]
This minor planet is named for the passerine bird Anthus campestris, or tawny pipit. It is on the Dutch Red List of birds endangered in the Netherlands.[3] It is also on the European Red List of Birds as of 2015.[10] The official naming citation was published by the Minor Planet Center on 2 February 1999 (M.P.C. 33793).[11]
Rotation period
In 2012, two rotational lightcurves of Campestris were obtained from photometric observations taken at the Palomar Transient Factory in California. Lightcurve analysis gave a rotation period of 9.2982 and 9.2990 hours with a brightness variation of 0.35 and 0.38 magnitude, respectively (U=2/2).[7]
Diameter and albedo
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Campestris measures 10.5 kilometers in diameter and its surface has an albedo of 0.058.[5] The Collaborative Asteroid Lightcurve Link assumes a higher albedo of 0.10 and calculates a diameter of 7.5 kilometers.[4]
- "JPL Small-Body Database Browser: 8776 Campestris (2287 T-3)" (2016-09-28 last obs.). Jet Propulsion Laboratory. Retrieved 22 June 2017.
- Schmadel, Lutz D. (2007). "(8776) Campestris". Dictionary of Minor Planet Names – (8776) Campestris. Springer Berlin Heidelberg. p. 665. doi:10.1007/978-3-540-29925-7_7214. ISBN 978-3-540-00238-3.
- "LCDB Data for (8776) Campestris". Asteroid Lightcurve Database (LCDB). Retrieved 22 March 2016.
- Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 22 March 2016.
- Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 11 March 2017.
- Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David; et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal. 150 (3): 35. arXiv:1504.04041. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved 22 March 2016.
- "8776 Campestris (2287 T-3)". Minor Planet Center. Retrieved 11 March 2017.
- "Minor Planet Discoverers". Minor Planet Center. 24 February 2016. Retrieved 22 March 2016.
- "European Red List of Birds" (PDF). BirdLife International. 2015. p. 56. Archived from the original (PDF) on 4 March 2016. Retrieved 22 March 2016.
- "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 11 March 2017.
- Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (5001)-(10000) – Minor Planet Center
- 8776 Campestris at AstDyS-2, Asteroids—Dynamic Site
- 8776 Campestris at the JPL Small-Body Database
