131 Vala
| Discovery[1] | |
|---|---|
| Discovered by | Christian Heinrich Friedrich Peters |
| Discovery date | 24 May 1873 |
| Designations | |
| Main belt[1] | |
| Orbital characteristics[1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 142.88 yr (52187 d) |
| Aphelion | 2.5979 AU (388.64 Gm) |
| Perihelion | 2.26604 AU (338.995 Gm) |
| 2.43198 AU (363.819 Gm) | |
| Eccentricity | 0.068233 |
| 3.79 yr (1385.3 d) | |
Average orbital speed | 19.08 km/s |
| 289.275° | |
| 0° 15m 35.532s / day | |
| Inclination | 4.9602° |
| 65.682° | |
| 160.641° | |
| Earth MOID | 1.25637 AU (187.950 Gm) |
| Jupiter MOID | 2.37651 AU (355.521 Gm) |
| Jupiter Tisserand parameter | 3.499 |
| Physical characteristics | |
| Dimensions | 40.44±1.8 km[1] |
| Mass | 6.9×1016 kg |
Equatorial surface gravity | 0.0113 m/s² |
Equatorial escape velocity | 0.0214 km/s |
| 5.1812 h (0.21588 d)[1] | |
| 0.1051±0.010 | |
| Temperature | ~178 K |
| K[2] (Bus) | |
| 10.03[1] | |
|
| |
131 Vala is an inner main-belt asteroid. It was discovered by C. H. F. Peters on May 24, 1873, and named after Völva, a prophetess in Norse mythology.[3] One observation of an occultation of a star by Vala is from Italy (May 26, 2002). 10-µm radiometric data collected from Kitt Peak in 1975 gave a diameter estimate of 34 km.[4]
In the Tholen classification system, it is categorized as an SU-type asteroid, while the Bus asteroid taxonomy system lists it as an K-type asteroid.[2] Photometric observations of this asteroid during 2007 at the Organ Mesa Observatory in Las Cruces, New Mexico were used to create a "nearly symmetric bimodal" light curve plot. This showed a rotation period of 10.359 ± 0.001 hours and a brightness variation of 0.09 ± 0.02 magnitude during each cycle.[5] The result is double the 5.18 hour period reported in the JPL Small-Body Database.[1]
On 2028-Apr-05, Vala will pass 0.0276 AU (4,130,000 km; 2,570,000 mi) from asteroid 2 Pallas.[6]
References
- 1 2 3 4 5 6 7 "JPL Small-Body Database Browser: 131 Vala" (2011-10-20 last obs (arc=138 years)). Jet Propulsion Laboratory. Retrieved 12 May 2016.
- 1 2 DeMeo, Francesca E.; et al. (July 2009), "An extension of the Bus asteroid taxonomy into the near-infrared" (PDF), Icarus, 202 (1), pp. 160–180, Bibcode:2009Icar..202..160D, doi:10.1016/j.icarus.2009.02.005, archived from the original (PDF) on 2014-03-17, retrieved 2013-04-08. See appendix A.
- ↑ Schmadel, Lutz D.; International Astronomical Union (2003). Dictionary of minor planet names. Berlin; New York: Springer-Verlag. p. 27. ISBN 978-3-540-00238-3. Retrieved 9 September 2011.
- ↑ Morrison, D.; Chapman, C. R. (March 1976), "Radiometric diameters for an additional 22 asteroids", Astrophysical Journal, 204, pp. 934–939, Bibcode:2008mgm..conf.2594S, doi:10.1142/9789812834300_0469.
- ↑ Pilcher, Frederick (June 2008), "Period Determination for 84 Klio, 98 Ianthe, 102 Miriam 112 Iphigenia, 131 Vala, and 650 Amalasuntha", The Minor Planet Bulletin, 35 (2), pp. 71–72, Bibcode:2008MPBu...35...71P, doi:10.1016/j.pss.2012.03.009.
- ↑ "JPL Close-Approach Data: 131 Vala" (2011-10-20 last obs (arc=138 years)). Retrieved 2011-12-07.
External links
- Orbital simulation from JPL (Java) / Ephemeris
- 131 Vala at the JPL Small-Body Database
