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1310 Villigera - Wikipedia

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1310 Villigera
Discovery^[1]
Modelled shape of Villigera from its lightcurve
Discovered by	A. Schwassmann
Discovery site	Bergedorf Obs.
Discovery date	28 February 1932
Designations
MPC designation	(1310) Villigera
Named after	Walther Villiger (Swiss astronomer)^[2]
Alternative designations	1932 DB · 1964 TC
Minor planet category	Mars-crosser^[1]^[3]^[4]
Orbital characteristics^[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	85.34 yr (31,171 days)
Aphelion	3.2438 AU
Perihelion	1.5424 AU
Semi-major axis	2.3931 AU
Eccentricity	0.3555
Orbital period (sidereal)	3.70 yr (1,352 days)
Mean anomaly	76.690°
Mean motion	0° 15^m 58.32^s / day
Inclination	21.071°
Longitude of ascending node	357.32°
Argument of perihelion	88.759°
Mars MOID	0.2634 AU
Physical characteristics
Dimensions	13.76±1.38 km^[5] 15.24 km (calculated)^[4]
Synodic rotation period	7.830±0.005 h^[6]^[a] 7.83001±0.00005 h^[7] 7.834±0.001 h^[8]
Geometric albedo	0.20 (assumed)^[4] 0.245±0.049^[5]
Spectral type	Tholen = S^[1] · S^[4] B–V = 0.905^[1] U–B = 0.445^[1]
Absolute magnitude (H)	11.45^[1]^[4]^[5]

1310 Villigera, provisional designation 1932 DB, is a stony asteroid and large Mars-crosser from the innermost regions of the asteroid belt, approximately 14 kilometers in diameter. It was discovered on 28 February 1932, by German astronomer Friedrich Schwassmann at Bergedorf Observatory in Hamburg, Germany.^[3] The asteroid was named after astronomer Walther Villiger.^[2]

Orbit and classification

Villigera is a Mars-crossing asteroid, a dynamically unstable group between the main belt and the near-Earth populations, crossing the orbit of Mars at 1.666 AU. It orbits the Sun in the inner main-belt at a distance of 1.5–3.2 AU once every 3 years and 8 months (1,352 days). Its orbit has an eccentricity of 0.36 and an inclination of 21° with respect to the ecliptic.^[1] No precoveries were taken, and no prior identifications were made. The body's observation arc begins 10 days after its official discovery observation with its first used observation at Uccle Observatory.^[3]

Physical characteristics

Villigera is a common S-type asteroid on the Tholen taxonomic scheme.^[1]

Lightcurves

In October 2001, a first rotational lightcurve of Villigera was obtained by astronomer Robert Koff at Thornton Observatory (713) in Colorado. Light curve analysis gave a well-defined rotation period of 7.830 hours with a brightness variation of 0.39 magnitude (U=3).^[6]^[a]

Photometric observations by astronomers René Roy, Raoul Behrend and Pierre Antonini in February 2006, gave a concurring period of 7.834 hours and an amplitude of 0.36 magnitude (U=3).^[8] In 2016, a modeled lightcurves using photometric data from various sources, rendered an identical period of 7.830 and a spin axis of (3.0°, 63°) in ecliptic coordinates.^[7]

Diameter and albedo

According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Villigera measures 13.76 kilometers in diameter and its surface has an albedo of 0.245.^[5] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 15.24 kilometers, with an absolute magnitude of 11.45.^[4] Based on a generic magnitude-to-diameter conversion, Villigera measures between 13 and 30 kilometers for an albedo in the range of 0.05 to 0.25.^[9]

This makes Villigera one of the largest mid-sized Mars-crossing asteroids comparable with 1065 Amundsenia (9.75 km), 1139 Atami (9.35 km), 1474 Beira (8.73 km), 1011 Laodamia (7.5 km), 1727 Mette (est. 9 km), 1131 Porzia (7 km), 1235 Schorria (est. 9 km), 985 Rosina (8.18 km) and 1468 Zomba (7 km), but smaller than the largest members of this dynamical group, namely, 132 Aethra, 323 Brucia, 1508 Kemi, 2204 Lyyli and 512 Taurinensis, which are all larger than 20 kilometers in diameter.

Naming

This minor planet was named in honour of Swiss astronomer Walther Villiger (1872–1938), who himself discovered the main-belt asteroid 428 Monachia at Munich in 1897.^[2] The official naming citation was also mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 120).^[2]

Notes

^ ^a ^b Lightcurve plot of (1310) Villigera, Robert Koff, Thornton Observatory (713). Summary figures at LCDB

References

^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ "JPL Small-Body Database Browser: 1310 Villigera (1932 DB)" (2017-07-02 last obs.). Jet Propulsion Laboratory. Retrieved 25 July 2017.
^ ^a ^b ^c ^d Schmadel, Lutz D. (2007). "(1310) Villigera". Dictionary of Minor Planet Names – (1310) Villigera. Springer Berlin Heidelberg. p. 107. doi:10.1007/978-3-540-29925-7_1311. ISBN 978-3-540-00238-3.
^ ^a ^b ^c "1310 Villigera (1932 DB)". Minor Planet Center. Retrieved 17 January 2017.
^ ^a ^b ^c ^d ^e ^f "LCDB Data for (1310) Villigera". Asteroid Lightcurve Database (LCDB). Retrieved 17 January 2017.
^ ^a ^b ^c ^d Alí-Lagoa, V.; Delbo', M. (July 2017). "Sizes and albedos of Mars-crossing asteroids from WISE/NEOWISE data" (PDF). Astronomy and Astrophysics. 603: 8. arXiv:1705.10263. Bibcode:2017A&A...603A..55A. doi:10.1051/0004-6361/201629917. Retrieved 20 October 2017.
^ ^a ^b Koff, R. A. (June 2002). "Lightcurve Photometry of 492 Gismonda, 1046 Edwin, and 1310 Villigera". The Minor Planet Bulletin. 29: 25–26. Bibcode:2002MPBu...29...25K. Retrieved 17 January 2017.
^ ^a ^b Hanus, J.; Durech, J.; Oszkiewicz, D. A.; Behrend, R.; Carry, B.; Delbo, M.; et al. (February 2016). "New and updated convex shape models of asteroids based on optical data from a large collaboration network". Astronomy and Astrophysics. 586: 24. arXiv:1510.07422. Bibcode:2016A&A...586A.108H. doi:10.1051/0004-6361/201527441.
^ ^a ^b Behrend, Raoul. "Asteroids and comets rotation curves – (1310) Villigera". Geneva Observatory. Retrieved 17 January 2017.
^ "Absolute Magnitude (H)". NASA/JPL. Archived from the original on 2 March 2001. Retrieved 17 January 2017.

External links

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 (1)-(5000) – Minor Planet Center
1310 Villigera at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
1310 Villigera at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

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