7119 Hiera
| Discovery [1] | |
|---|---|
| Discovered by | C. Shoemaker E. Shoemaker |
| Discovery site | Palomar Obs. |
| Discovery date | 11 January 1989 |
| Designations | |
| 7119 Hiera | |
| Pronunciation | hye'-ər-ə |
Named after | Hiera (Greek mythology)[2] |
| 1989 AV2 | |
| Jupiter trojan [3][4] (Greek camp)[5] | |
| Orbital characteristics [1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 28.54 yr (10,424 days) |
| Aphelion | 5.6774 AU |
| Perihelion | 4.6332 AU |
| 5.1553 AU | |
| Eccentricity | 0.1013 |
| 11.71 yr (4,275 days) | |
| 175.31° | |
| 0° 5m 3.12s / day | |
| Inclination | 19.305° |
| 285.55° | |
| 121.25° | |
| Jupiter MOID | 0.1944 AU |
| TJupiter | 2.8780 |
| Physical characteristics | |
| Dimensions | 59.15±0.37 km[6] 76.40±7.0 km (IRAS:2)[1] 76.45 km (derived)[4] 77.29±4.66 km[7] |
| 400 h[8] | |
| 0.036±0.005[7] 0.0364±0.008 (IRAS:2)[1] 0.0398 (derived)[4] 0.067±0.010[6] | |
| C [4] | |
| 9.7[1][4][6] 9.80[7] 9.82±0.37[9] | |
7119 Hiera (ˈhaɪərə), provisional designation 1989 AV2, is a carbonaceous Jupiter trojan and potentially slow rotator from the Greek camp, approximately 76 kilometers in diameter. It was discovered on 11 January 1989, by American astronomer couple Carolyn and Eugene Shoemaker at the U.S. Palomar Observatory in California.[3]
The dark C-type Jovian asteroid resides in the leading Greek camp at Jupiter's L4 Lagrangian point, 60° ahead of the gas giant's orbit (see Trojans in astronomy). It orbits the Sun at a distance of 4.6–5.7 AU once every 11 years and 9 months (4,275 days). Its orbit has an eccentricity of 0.10 and an inclination of 19° with respect to the ecliptic.[1] The first precovery was taken at the discovering observatory in 1987, extending the asteroid's observation arc by 14 motnths prior to its discovery.[3]
In June 2009, this Jovian asteroid was observed by astronomer Stefano Mottola at the Spanish Calar Alto Observatory during 5 consecutive nights. Although a light-curve could not be obtained and a systematic instrumental error could not be ruled out, the body displayed a slowly, ever decreasing brightness of 0.1 in magnitude, which would translate into a rotation period of at least 400 hours (U=1).[8]
According to the space-based surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid measures between 56 and 77 kilometers in diameter and its surface has an albedo between 0.036 and 0.072.[1][6][7] The Collaborative Asteroid Lightcurve Link agrees with the results obtained by IRAS, and derives an albedo of 0.0389 with a diameter of 76.5 kilometers, based on an absolute magnitude of 9.7.[4]
The minor planet was named after Hiera from Greek mythology, a female general in the Trojan war. However, her name was removed from Homer's Iliad, as to not diminish the greatness of Helen of Troy, the daughter of Zeus and cause for the Trojan war (also see 101 Helena). Naming citation was published on 4 May 1999 (M.P.C. 34625).[10] Although the asteroid resides in the Greek camp, the citation describes Hiera as a general of the Mysians, who fought on the Trojan, not the Greek side in the Trojan War.
References
- ^ a b c d e f g "JPL Small-Body Database Browser: 7119 Hiera (1989 AV2)" (2016-06-06 last obs.). Jet Propulsion Laboratory. Retrieved July 2016.
{{cite web}}: Check date values in:|accessdate=(help) - ^ Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (7119) Hiera. Springer Berlin Heidelberg. p. 577. ISBN 978-3-540-00238-3. Retrieved July 2016.
{{cite book}}: Check date values in:|accessdate=(help) - ^ a b c "7119 Hiera (1989 AV2)". Minor Planet Center. Retrieved July 2016.
{{cite web}}: Check date values in:|accessdate=(help) - ^ a b c d e f "LCDB Data for (7119) Hiera". Asteroid Lightcurve Database (LCDB). Retrieved July 2016.
{{cite web}}: Check date values in:|accessdate=(help) - ^ "List of Jupiter Trojans". Minor Planet Center. 20 June 2016. Retrieved June 2016.
{{cite web}}: Check date values in:|accessdate=(help) - ^ a b c d 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 July 2016.
{{cite journal}}: Check date values in:|access-date=(help) - ^ a b c d Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved July 2016.
{{cite journal}}: Check date values in:|access-date=(help) - ^ a b Mottola, Stefano; Di Martino, Mario; Erikson, Anders; Gonano-Beurer, Maria; Carbognani, Albino; Carsenty, Uri; et al. (May 2011). "Rotational Properties of Jupiter Trojans. I. Light Curves of 80 Objects". The Astronomical Journal. 141 (5): 32. Bibcode:2011AJ....141..170M. doi:10.1088/0004-6256/141/5/170. Retrieved July 2016.
{{cite journal}}: Check date values in:|access-date=(help) - ^ Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved July 2016.
{{cite journal}}: Check date values in:|access-date=(help) - ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved July 2016.
{{cite web}}: Check date values in:|accessdate=(help)
External links
- Asteroid Lightcurve Database (LCDB), query form (info)
- 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
- 7119 Hiera at the JPL Small-Body Database