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1656 Suomi

Asteroid

Field	Value
minorplanet	yes
name	1656 Suomi
background	#FA8072
discovery_ref
discoverer	Y. Väisälä
discovery_site	Turku Obs.
discovered	11 March 1942
mpc_name	(1656) Suomi
alt_names	1942 EC1955 HL
named_after	Finland (country)
mp_category	Mars-crosserHungaria
binary
orbit_ref
epoch	4 September 2017 (JD 2458000.5)
uncertainty	0
observation_arc	75.24 yr
aphelion	2.1093 AU
perihelion	1.6456 AU
semimajor	1.8774 AU
eccentricity	0.1235
period	2.57 yr (940 days)
mean_anomaly	174.69°
mean_motion	/ day
inclination	25.067°
asc_node	175.57°
arg_peri	287.44°
moid	0.7551 AU
satellites	1 1.98+ km ( 0.26Ds/Dp; P: 57.92 h)
mean_diameter	(IRAS:3)
km
rotation
h
h
h
h
h (wrong)
albedo	(IRAS:3)

spectral_type	Tholen = SS
abs_magnitude	12.913.16

binary km h h h h h (wrong)

1656 Suomi (prov. designation: ) is a binary Hungaria asteroid and sizable Mars-crosser from the innermost regions of the asteroid belt. It was discovered on 11 March 1942, by Finnish astronomer Yrjö Väisälä at Turku Observatory in Southwest Finland, who named it "Suomi", the native name of Finland. The stony asteroid has a short rotation period of 2.6 hours and measures approximately 7.9 kilometers in diameter. In June 2020, a companion was discovered by Brian Warner, Robert Stephens and Alan Harris. The satellite measures more than 1.98 kilometers in diameter, about 26% of the primary, which it orbits once every 57.9 hours at an average distance of 30 kilometers.

Orbit and classification

Suomi is a member of the Hungaria family, which form the innermost dense concentration of asteroids in the Solar System. It orbits the Sun at a distance of 1.6–2.1 AU once every 2 years and 7 months (940 days). Its orbit has an eccentricity of 0.12 and an inclination of 25° with respect to the ecliptic.

It is also classified as a Mars-crossing asteroid, since its perihelion – the point in its orbit, where it is nearest to the Sun – is less than the average orbital distance of the planet Mars (1.666 AU). Suomis observation arc begins on the preceding night of its discovery, with an observation taken at Johannesburg Observatory on 10 March 1942.

Naming

As with 1453 Fennia, this minor planet was named after Finland (). The official was published by the Minor Planet Center on 20 February 1976 (M.P.C. 3932).

Physical characteristics

In the Tholen taxonomy, Suomi is a stony S-type asteroid.

Diameter and albedo

According to the survey carried out by the Infrared Astronomical Satellite IRAS, Suomi measures 7.86 kilometers in diameter and its surface has an albedo of 0.156, making it one of the largest Mars crossing asteroid with a known diameter. The Collaborative Asteroid Lightcurve Link (CALL) agrees with IRAS, and adopts an albedo of 0.157 and a diameter of 7.9 kilometers with an absolute magnitude of 13.146.

Rotation period

Since 1991, a large number of rotational lightcurves of Suomi have been obtained from photometric observations (also see infobox). CALL adopts a rotation period of 2.583 hours with a brightness variation of 0.20 magnitude ().

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.

mars-crossing-asteroids hungaria-asteroids discoveries-by-yrjö-väisälä named-minor-planets binary-asteroids s-type-asteroids-(tholen) astronomical-objects-discovered-in-1942

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