131 Vala

Vala (minor planet designation: 131 Vala) is an inner main-belt asteroid. It was discovered by C. H. F. Peters on 24 May 1873, and named after Völva, a prophetess in Norse mythology.[4] One observation of an occultation of a star by Vala is from Italy (26 May 2002). 10-μm radiometric data collected from Kitt Peak in 1975 gave a diameter estimate of 34 km.[5]

131 Vala
Discovery[1]
Discovered byChristian Heinrich Friedrich Peters
Discovery date24 May 1873
Designations
(131) Vala
Pronunciation/ˈvɑːlə/[2]
Main belt[1]
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc142.88 yr (52187 d)
Aphelion2.5979 AU (388.64 Gm)
Perihelion2.26604 AU (338.995 Gm)
2.43198 AU (363.819 Gm)
Eccentricity0.068233
3.79 yr (1385.3 d)
19.08 km/s
289.275°
0° 15m 35.532s / day
Inclination4.9602°
65.682°
160.641°
Earth MOID1.25637 AU (187.950 Gm)
Jupiter MOID2.37651 AU (355.521 Gm)
TJupiter3.499
Physical characteristics
Dimensions40.44±1.8 km[1]
Mass6.9×1016 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[3] (Bus)
10.03[1]

    In the Tholen classification system, it is categorized as an SU-type asteroid, while the Bus asteroid taxonomy system lists it as a K-type asteroid.[3] 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.[6] 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.[7]

    References
    1. "JPL Small-Body Database Browser: 131 Vala" (2011-10-20 last obs (arc=138 years)). Jet Propulsion Laboratory. Retrieved 12 May 2016.
    2. "Vala". Dictionary.com Unabridged. Random House.
    3. 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 17 March 2014, retrieved 8 April 2013. See appendix A.
    4. 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.
    5. 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.
    6. 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, arXiv:1203.4336, Bibcode:2008MPBu...35...71P, doi:10.1016/j.pss.2012.03.009.
    7. "JPL Close-Approach Data: 131 Vala" (2011-10-20 last obs (arc=138 years)). Retrieved 7 December 2011.


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