2678 Aavasaksa

2678 Aavasaksa, provisional designation 1938 DF1, is a stony Flora asteroid from the inner regions of the asteroid belt, approximately 8 kilometers in diameter.

2678 Aavasaksa
Discovery [1]
Discovered byY. Väisälä
Discovery siteTurku Obs.
Discovery date24 February 1938
Designations
(2678) Aavasaksa
Named after
Aavasaksa
(hill in Finnish Lapland)[2]
1938 DF1 · 1952 KM
1955 DH · 1977 SX1
1979 FP2 · A916 WA
main-belt · Flora [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc79.20 yr (28,927 days)
Aphelion2.4553 AU
Perihelion2.0636 AU
2.2594 AU
Eccentricity0.0867
3.40 yr (1,240 days)
204.08°
0° 17m 24.72s / day
Inclination3.4446°
54.033°
45.844°
Physical characteristics
Dimensions8.19 km (calculated)[3]
8.371±0.096 km[4][5]
24 h[6]
0.24 (assumed)[3]
0.276±0.037[4][5]
S [3]
12.4[4] · 12.6[1][3]

    The asteroid was discovered on 24 February 1938, by Finnish astronomer Yrjö Väisälä at Turku Observatory in Southwest Finland.[7] It was named for the Aavasaksa hill in Finland.[2]

    Orbit and classification

    The S-type asteroid is a member of the Flora family, one of the largest groups of stony asteroids in the main-belt. It orbits the Sun in the inner main-belt at a distance of 2.1–2.5 AU once every 3 years and 5 months (1,240 days). Its orbit has an eccentricity of 0.09 and an inclination of 3° with respect to the ecliptic.[1]

    Aavasaksa was first identified as A916 WA at Bergedorf Observatory in 1916. Its observation arc begins at Mount Wilson Observatory in 1935, or 3 years prior to its official discovery observation at Turku.[7]

    Physical characteristics

    In January 2009, a provisional and fragmentary photometric lightcurve of Aavasaksa was obtained at the Via Capote Observatory in California. Lightcurve analysis gave it a longer than average rotation period of 24 hours with a brightness amplitude of 0.4 in magnitude (U=1).[6]

    According to the survey carried out by the NEOWISE mission of NASA's space-based Wide-field Infrared Survey Explorer, Aavasaksa measures 8.4 kilometers in diameter and its surface has an albedo of 0.28,[4] while the Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24, derived from 8 Flora, the Flora family's largest member and namesake, and calculates a diameter of 8.2 kilometers.[3]

    Naming

    This minor planet is named after Aavasaksa, a sharp-edged hill in Finnish Lapland, just south of the Arctic Circle. The hill is located in the Tornio River Valley, after which the minor planet 1471 Tornio is named, and is often considered the southernmost point in Finland, where the natural phenomenon of the midnight sun is visible each June.[2] The official naming citation was published by the Minor Planet Center on 26 May 1983 (M.P.C. 7947).[8]

    References
    1. "JPL Small-Body Database Browser: 2678 Aavasaksa (1938 DF1)" (2017-05-05 last obs.). Jet Propulsion Laboratory. Retrieved 14 June 2017.
    2. Schmadel, Lutz D. (2007). "(2678) Aavasaksa". Dictionary of Minor Planet Names – (2678) Aavasaksa. Springer Berlin Heidelberg. p. 219. doi:10.1007/978-3-540-29925-7_2679. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (2678) Aavasaksa". Asteroid Lightcurve Database (LCDB). Retrieved 26 April 2016.
    4. 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 14 January 2016.
    5. Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 6 December 2016.
    6. Brinsfield, James W. (July 2009). "Asteroid Lightcurve Analysis at the Via Capote Observatory: 2009 1st Quarter". The Minor Planet Bulletin. 36 (3): 127–128. Bibcode:2009MPBu...36..127B. ISSN 1052-8091. Retrieved 14 January 2016.
    7. "2678 Aavasaksa (1938 DF1)". Minor Planet Center. Retrieved 26 April 2016.
    8. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 26 April 2016.

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