1768 Appenzella

1768 Appenzella
Discovery [1]
Discovered by P. Wild
Discovery site Zimmerwald Obs.
Discovery date 23 September 1965
Designations
MPC designation 1768 Appenzella
Named after
 Appenzell (canton)[2]
1965 SA · 1934 PM
1942 TH
main-belt · Nysa [3]
Orbital characteristics [1]
Epoch 27 June 2015 (JD 2457200.5)
Uncertainty parameter 0
Observation arc 73.27 yr (26,763 days)     
Aphelion 2.8893 AU
Perihelion 2.0114 AU
2.4503 AU
Eccentricity 0.1791
3.84 yr (1,401 days)
330.55°
Inclination 3.2610°
12.420°
19.375°
Physical characteristics
Dimensions 20.86±2.3 km (IRAS:2)[1]
19.30±0.17 km[4]
20.221±0.129 km[5]
21±2 km[6]
5.1839±0.0001 h[7]
0.0338±0.009 (IRAS:2)[1]
0.039±0.008[4]
0.0316±0.0067[5]
0.03±0.01[6]
B–V = 0.615
U–B = 0.230
F (Tholen)[1]
C (SMASS)[1]
C [3]
12.70[1]

    1768 Appenzella, provisional designation 1965 SA, is a carbonaceous asteroid from the inner regions of the asteroid belt, about 21 kilometers in diameter. It was discovered by Swiss astronomer Paul Wild at Zimmerwald Observatory near Bern, Switzerland, on 23 September 1965.[8]

    The dark C-type asteroid is a member of the Polanian subgroup of the Nysa family of asteroids and shows a rare F-type spectrum in the Tholen classification scheme. It orbits the Sun at a distance of 2.0–2.9 AU once every 3 years and 10 months (1,401 days). Its orbit is tilted by 3 degrees to the plane of the ecliptic and shows an eccentricity of 0.18.[1]

    In 2011, a photometric light-curve analysis by French astronomer René Roy at the Blauvac Observatory (627) in southeastern France rendered a well-defined a rotation period of 5.1839±0.0001 hours with a brightness amplitude of 0.53 in magnitude.[7] Based on the surveys carried out by the Infrared Astronomical Satellite, IRAS, and NASA's Wide-field Infrared Survey Explorer and its subsequent NEOWISE mission, the asteroid's surface has very low albedo in the range between 0.03 and 0.04.[4][5][6]

    Appenzella, was named in 1971 by the discoverer in honor of the rural Swiss Canton of Appenzell, on the occasion of the 150th anniversary of the public middle school Kantonsschule Trogen in Appenzell Ausserrhoden, founded in 1821.[2][9]

    References

    1. 1 2 3 4 5 6 7 8 "JPL Small-Body Database Browser: 1768 Appenzella (1965 SA)" (2015-12-17 last obs.). Jet Propulsion Laboratory. Retrieved January 2016.
    2. 1 2 Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1768) Appenzella. Springer Berlin Heidelberg. p. 141. ISBN 978-3-540-29925-7. Retrieved October 2015.
    3. 1 2 "LCDB Data for (1768) Appenzella". Asteroid Lightcurve Database (LCDB). Retrieved January 2016.
    4. 1 2 3 Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters 759 (1): 5. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved January 2016.
    5. 1 2 3 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 January 2016.
    6. 1 2 3 Alí-Lagoa, V.; de León, J.; Licandro, J.; Delbó, M.; Campins, H.; Pinilla-Alonso, N.; et al. (June 2013). "Physical properties of B-type asteroids from WISE data". Astronomy and Astrophysics 554: 16. arXiv:1303.5487. Bibcode:2013A&A...554A..71A. doi:10.1051/0004-6361/201220680. Retrieved January 2016.
    7. 1 2 Behrend, Raoul. "Asteroids and comets rotation curves – (1768) Appenzella". Geneva Observatory. Retrieved January 2016.
    8. ↑ "1768 Appenzella (1965 SA)". Minor Planet Center. Retrieved January 2016.
    9. ↑ "Kanstonsschule Trogen". Kantonsschule Trogen (in German). 2014. Retrieved January 2016.

    External links


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