astro.wikisort.org - Asteroid

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 by	Y. Väisälä
Discovery site	Turku Obs.
Discovery date	18 October 1939
Designations
MPC designation	(2826) Ahti
Named after	Ahti (Finnish mythology)[2]
Alternative designations	1939 UJ · 1942 FH 1950 TG3 · 1968 UT2 1979 RG · 1980 VK1
Minor planet category	main-belt · (outer) [1]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	77.63 yr (28,355 days)
Aphelion	3.3789 AU
Perihelion	3.0708 AU
Semi-major axis	3.2248 AU
Eccentricity	0.0478
Orbital period (sidereal)	5.79 yr (2,115 days)
Mean anomaly	2.3046°
Mean motion	0° 10m 12.72s / day
Inclination	15.466°
Longitude of ascending node	33.671°
Argument of perihelion	150.83°
Physical characteristics
Dimensions	36.60 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]
Synodic rotation period	24 h[9]
Geometric albedo	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]
Spectral type	C [3]
Absolute magnitude (H)	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

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
• 2826 Ahti at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 2826 Ahti at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

На других языках

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[de] (2826) Ahti

(2826) Ahti ist ein Asteroid des Hauptgürtels, der am 18. Oktober 1939 von dem finnischen Astronomen Yrjö Väisälä in Turku entdeckt wurde.

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- [en] 2826 Ahti

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[es] (2826) Ahti

(2826) Ahti es un asteroide perteneciente al cinturón exterior de asteroides descubierto por Yrjö Väisälä desde el Observatorio de Iso-Heikkilä, en Turku, Finlandia, el 18 de octubre de 1939.

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