2826 Ahti

2826 Ahti, provisional designation 1939 UJ, is a carbonaceous asteroid from the outer region of the asteroid belt, about 37 kilometers in diameter. The asteroid was discovered on 18 October 1939, by Finnish astronomer Yrjö Väisälä at Turku Observatory, Southwest Finland.[11] It was named after Ahti from Finnish mythology.[2]

2826 Ahti
Discovery [1]
Discovered byY. Väisälä
Discovery siteTurku Obs.
Discovery date18 October 1939
Designations
(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 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc77.63 yr (28,355 days)
Aphelion3.3789 AU
Perihelion3.0708 AU
3.2248 AU
Eccentricity0.0478
5.79 yr (2,115 days)
2.3046°
0° 10m 12.72s / day
Inclination15.466°
33.671°
150.83°
Physical characteristics
Dimensions36.60 km (derived)[3]
36.71±2.7 km (IRAS:24)[4]
39.975±0.157[5]
42.16±0.62 km[6]
42.373±0.121 km[7]
55.33±0.29 km[8]
24 h[9]
0.023±0.004[8][5]
0.0471±0.0122[7]
0.0479 (derived)[3]
0.049±0.002[6]
0.0628±0.010 (IRAS:24)[4]
C [3]
11.1[1][3] · 10.80[4][6][7] · 11.00[8] · 11.25±0.25[10]

    Orbit and classification

    Ahti orbits the Sun in the outer main-belt at a distance of 3.1–3.4 AU once every 5 years and 9 months (2,115 days). Its orbit has an eccentricity of 0.05 and an inclination of 15° with respect to the ecliptic.[1]

    Physical characteristics

    Ahti has been characterized as a dark C-type asteroid.[3]

    Rotation period

    A photmetric lightcurve analysis by French astronomer Pierre Antonini in 2006, gave a longer than average rotation period of 24 hours (U=1). The result, however, is considered to be only provisional.[3][9]

    Diameter and albedo

    According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Ahti measures between 36.71 and 55.33 kilometers in diameter and its surface has a low albedo between 0.023 and 0.0628.[4][5][6][7][8]

    The Collaborative Asteroid Lightcurve Link agrees best with the results obtained by IRAS, and derives a diameter of 36.60 kilometers with an albedo of 0.0479 and an absolute magnitude of 11.1.[3]

    Naming

    This 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 asteroid 1454 Kalevala is named after the Finish national epic. Ahti is also a common masculine name in Finland.[2] The official naming citation was published by the Minor Planet Center on 26 May 1983 (M.P.C. 7949).[12]

    References
    1. "JPL Small-Body Database Browser: 2826 Ahti (1939 UJ)" (2017-06-05 last obs.). Jet Propulsion Laboratory. Retrieved 14 June 2017.
    2. Schmadel, Lutz D. (2007). "(2826) Ahti". Dictionary of Minor Planet Names – (2826) Ahti. Springer Berlin Heidelberg. p. 231. doi:10.1007/978-3-540-29925-7_2827. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (2826) Ahti". Asteroid Lightcurve Database (LCDB). Retrieved 1 May 2016.
    4. Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. 12: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 22 October 2019.
    5. Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 6 December 2016.
    6. 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 17 October 2019. (online, AcuA catalog p. 153)
    7. 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 1 May 2016.
    8. 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 1 May 2016.
    9. Behrend, Raoul. "Asteroids and comets rotation curves – (2826) Ahti". Geneva Observatory. Retrieved 1 May 2016.
    10. 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:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 1 May 2016.
    11. "2826 Ahti (1939 UJ)". Minor Planet Center. Retrieved 1 May 2016.
    12. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 5 August 2016.

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