astro.wikisort.org - Asteroid

3212 Agricola, provisional designation 1938 DH₂, is a stony Flora asteroid from the inner regions of the asteroid belt, approximately 5 kilometers in diameter. It was discovered by Finnish astronomer Yrjö Väisälä at Turku Observatory in Southwest Finland, on 19 February 1938, and named after reformer Mikael Agricola.[8]

3212 Agricola

Discovery [1]
Discovered by	Y. Väisälä
Discovery site	Turku Obs.
Discovery date	19 February 1938
Designations
MPC designation	(3212) Agricola
Pronunciation	/əˈɡrɪkələ/[2]
Named after	Mikael Agricola (reformer)[3]
Alternative designations	1938 DH2 · 1982 BB2
Minor planet category	main-belt · Flora [4]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	78.37 yr (28,626 days)
Aphelion	2.5980 AU
Perihelion	1.9148 AU
Semi-major axis	2.2564 AU
Eccentricity	0.1514
Orbital period (sidereal)	3.39 yr (1,238 days)
Mean anomaly	180.14°
Mean motion	0° 17m 26.88s / day
Inclination	7.8102°
Longitude of ascending node	109.97°
Argument of perihelion	35.064°
Physical characteristics
Dimensions	4.442±0.287 km[5][6] 5.41 km (calculated)[4]
Synodic rotation period	9 h[lower-alpha 1]
Geometric albedo	0.24 (assumed)[4] 0.391±0.070[5][6]
Spectral type	S [4]
Absolute magnitude (H)	13.6[1] · 13.4[5] · 13.38±0.52[7] · 13.5[4]

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 1.9–2.6 AU once every 3 years and 5 months (1,238 days). Its orbit has an eccentricity of 0.15 and an inclination of 8° with respect to the ecliptic.[1]

Physical characteristics

A rotational lightcurve obtained from photometric observations by Czech astronomer Petr Pravec in May 2006, rendered a period of 9 hours with a brightness variation of 0.07 in magnitude (U=n/a).[lower-alpha 1] According to the survey carried out by the NEOWISE mission of NASA's space-based Wide-field Infrared Survey Explorer, the asteroid measures 4.4 kilometers in diameter, and its surface has a high albedo of 0.39,[5][6] while the Collaborative Asteroid Lightcurve Link assumes an intermediate albedo of 0.24 – derived from 8 Flora, the largest member and namesake of this orbital family – and calculates a larger diameter of 5.4 kilometers.[4]

Naming

This minor planet was named in honor of Finnish clergyman Mikael Agricola (c. 1510–1557), bishop and reformer of Finland, often called "father of Finnish literature". He published his Abckiria, the first book printed in the Finnish language, and translated the New Testament into Finnish.[3] The official naming citation was published by the Minor Planet Center on 27 June 1991 (M.P.C. 18450).[9]

Notes

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
• 3212 Agricola at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 3212 Agricola at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

На других языках

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[de] (3212) Agricola

(3212) Agricola ist ein Asteroid des Hauptgürtels, der am 19. Februar 1938 von dem finnischen Astronomen Yrjö Väisälä in Turku entdeckt wurde.

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- [en] 3212 Agricola

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