2826 Ahti

2826 Ahti
Discovery [1]
Discovered by Y. Väisälä
Discovery site Turku Obs.
Discovery date 18 October 1939
Designations
MPC designation 2826 Ahti
Named after
 Ahti (Finnish mythology)[2]
1939 UJ · 1942 FH
1950 TG3 · 1968 UT2
1979 RG · 1980 VK1
main-belt (outer)[1]
Orbital characteristics [1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 76.44 yr (27,921 days)       
Aphelion 3.3726 AU
Perihelion 3.0706 AU
3.2216 AU
Eccentricity 0.0468
5.78 yr (2,112 days)
293.70°
0° 10m 13.44s / day
Inclination 15.464°
33.677°
151.27°
Physical characteristics
Dimensions 36.71±2.7 km (IRAS:24)[3]
42.16±0.62 km[4]
42.373±0.121 km[5]
55.33±0.29 km[6]
36.60 km (derived)[7]
24 h[8]
0.0628±0.010 (IRAS:24)[3]
0.049±0.002[4]
0.0471±0.0122[5]
0.023±0.004[6]
0.0479 (derived)[7]
C [7]
11.1[1][7]
10.80[3][4][5]
11.00[6]
11.25±0.25[9]

    2826 Ahti, provisional designation 1939 UJ, is a carbonaceous asteroid from the outer region of the asteroid belt, about 37 kilometers in diameter. It was discovered on 18 October 1939, by Finnish astronomer Yrjö Väisälä at Turku Observatory, Southwest Finland.[10]

    The C-type asteroid orbits the Sun at a distance of 3.1–3.4 AU once every 5 years and 9 months (2,113 days). Its orbit is tilted by 15 degrees to the plane of the ecliptic and shows an eccentricity of 0.05.[1]

    A photmetric light-curve analysis by French astronomer Pierre Antonini in 2006 rendered a relatively long rotation period of 24 hours (U=1). The result, however, is considered to be only provisional.[7][8] According to the surveys carried out by the Infrared Astronomical Satellite, IRAS, the Japanese Akari satellite, and the U.S. Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid's surface has a very low albedo in the range of 0.02 to 0.06. While the Collaborative Asteroid Lightcurve Link agrees with the asteroid's diameter of 37 kilometer found by IRAS, data from the Akari and WISE/NEOWISE mission give a larger diameter of 42 and 55 kilometers, respectively.[3][4][5][6]

    The minor planet was named for the god of the sea and of fishing, Ahti (also known as Ahto), mentioned in the Kalevala, a 19th-century work of epic poetry from Karelian and Finnish oral folklore and mythology. The minor planet 1454 Kalevala is named after the Finish national epic. Ahti is also a common boy's name in Finland.[2] Naming citation was published on 26 May 1983 (M.P.C. 7949).[11]

    References

    1. 1 2 3 4 5 "JPL Small-Body Database Browser: 2826 Ahti (1939 UJ)" (2016-03-28 last obs.). Jet Propulsion Laboratory. Retrieved 1 May 2016.
    2. 1 2 Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (2826) Ahti. Springer Berlin Heidelberg. p. 231. ISBN 978-3-540-00238-3. Retrieved 1 May 2016.
    3. 1 2 3 4 Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. Bibcode:2004PDSS...12.....T. Retrieved 9 January 2016.
    4. 1 2 3 4 Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved 1 May 2016.
    5. 1 2 3 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:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 1 May 2016.
    6. 1 2 3 4 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:1209.5794Freely accessible. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 1 May 2016.
    7. 1 2 3 4 5 "LCDB Data for (2826) Ahti". Asteroid Lightcurve Database (LCDB). Retrieved 1 May 2016.
    8. 1 2 Behrend, Raoul. "Asteroids and comets rotation curves – (2826) Ahti". Geneva Observatory. Retrieved 1 May 2016.
    9. ↑ Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762Freely accessible. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 1 May 2016.
    10. ↑ "2826 Ahti (1939 UJ)". Minor Planet Center. Retrieved 1 May 2016.
    11. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 5 August 2016.

    External links

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