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1449 Virtanen

Main-belt asteroid

Field	Value
minorplanet	yes
name	1449 Virtanen
background	#D6D6D6
image	001449-asteroid shape model (1449) Virtanen.png
caption	Shape of Virtanen modelled from its lightcurve
discovery_ref
discovered	20 February 1938
discoverer	Y. Väisälä
discovery_site	Turku Obs.
mpc_name	(1449) Virtanen
alt_names	1938 DO1928 DC
named_after	Artturi Virtanen (biochemist)
mp_category	main-beltFlora
orbit_ref
epoch	4 September 2017 (JD 2458000.5)
uncertainty	0
observation_arc	89.10 yr (32,543 days)
aphelion	2.5378 AU
perihelion	1.9069 AU
semimajor	2.2223 AU
eccentricity	0.1419
period	3.31 yr (1,210 days)
mean_anomaly	289.08°
mean_motion	/ day
inclination	6.6413°
asc_node	110.78°
arg_peri	132.16°
dimensions	km
km
km
km
10.31 km (calculated)
rotation	h (R)
h
h
h
h
h
h (R)
h (S)
albedo	0.24 (assumed)

spectral_type	Tholen = SS
abs_magnitude	(R) (R)12.012.112.25 (S)

km km km 10.31 km (calculated) h h h h h h (R) h (S)

1449 Virtanen, provisional designation , is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 9.2 kilometers in diameter. It was discovered on 20 February 1938, by Finnish astronomer Yrjö Väisälä at Turku Observatory in Southwest Finland, and named for Finnish biochemist Artturi Virtanen.

Description

Virtanen is a member of the Flora family, one of the largest collisional populations of stony asteroids in the main-belt. It orbits the Sun in the inner main-belt at a distance of 1.9–2.5 AU once every 3 years and 4 months (1,210 days). Its orbit has an eccentricity of 0.14 and an inclination of 7° with respect to the ecliptic. In 1928, Virtanen was first identified as at Heidelberg, extending the body's observation arc by 10 years prior to its official discovery at Turku.

Physical characteristics

In the Tholen taxonomy, Virtanen is classified as a common S-type asteroid.

Lightcurves

Virtanens first rotational lightcurve was obtained by astronomers Pierre Antonini and Silvano Casulli in May 2007, followed by Australian astronomer Julian Oey at Leura (E17) and Kingsgrove Observatory (E19) in June 2008. The lightcurves gave a rotation period of approximately 30.5 hours with a brightness variation of 0.6 magnitude ().

Additional periods were obtained from photometric observation in the R and S-band at the Palomar Transient Factory (), and from modeled data using the Lowell photometric database and other data sources, which also gave two spin axis of (307.0°, 58.0°) and (89.0°, 61.0°) in ecliptic coordinates, respectively ().

Diameter and albedo

According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Virtanen measures between 9.15 and 9.947 kilometers in diameter, and its surface has an albedo between 0.285 and 0.36.

The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from 8 Flora, the largest member and namesake of its family – and calculates a diameter of 10.31 kilometers with an absolute magnitude of 12.1.

Naming

This minor planet was named for famous Finnish biochemist Artturi Virtanen (1895–1973), recipient of the 1945 Nobel Prize in Chemistry and president of the Academy of Finland for many years. The official was published by the Minor Planet Center on 15 February 1970 (M.P.C. 3023).

References

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

flora-asteroids discoveries-by-yrjö-väisälä named-minor-planets s-type-asteroids-(tholen) astronomical-objects-discovered-in-1938

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