astro.wikisort.org - Asteroid

57424 Caelumnoctu, provisional designation 2001 SP₂₂, is an Eoan asteroid from the outer regions of the asteroid belt, approximately 7 kilometers in diameter. It was discovered on 16 September 2001, by astronomers of the Lincoln Near-Earth Asteroid Research at Lincoln Laboratory's Experimental Test Site near Socorro, New Mexico. The asteroid was named for the BBC television programme The Sky at Night.[2]

57424 Caelumnoctu

Orbital diagram of Caelumnoctu
Discovery [1][2]
Discovered by	LINEAR
Discovery site	Lincoln Lab's ETS
Discovery date	16 September 2001
Designations
MPC designation	(57424) Caelumnoctu
Named after	The Sky at Night [2] (BBC astronomy programme)
Alternative designations	2001 SP22 · 1982 BV4
Minor planet category	main-belt · (outer) Eos [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	35.76 yr (13,061 days)
Aphelion	3.3243 AU
Perihelion	2.7495 AU
Semi-major axis	3.0369 AU
Eccentricity	0.0946
Orbital period (sidereal)	5.29 yr (1,933 days)
Mean anomaly	334.96°
Mean motion	0° 11m 10.32s / day
Inclination	9.6708°
Longitude of ascending node	353.32°
Argument of perihelion	45.951°
Physical characteristics
Dimensions	6.876±0.356 km[4]
Geometric albedo	0.113±0.019[4]
Absolute magnitude (H)	13.7[1]

Orbit and classification

Caelumnoctu is a member the Eos family (606),[3] the largest asteroid family in the outer main belt consisting of nearly 10,000 asteroids.[5]^: 23

It orbits the Sun at a distance of 2.7–3.3 AU once every 5 years and 3 months (1,933 days; semi-major axis of 3.04 AU). Its orbit has an eccentricity of 0.09 and an inclination of 10° with respect to the ecliptic.[1]

The body's observation arc begins with its first identification as 1982 BV₄ at Kiso Observatory in January 1982, more than 19 years prior to its official discovery observation at Socorro.[2]

Physical characteristics

The body's spectral type is unknown.[1] Its albedo, however, corresponds to the K-type asteroids of which the Eos family predominantly consists.[5]^: 23

Diameter and albedo

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Caelumnoctu measures 6.876 kilometers in diameter and its surface has an albedo of 0.113.[4]

Rotation period

As of 2017, no rotational lightcurve of Caelumnoctu has been obtained from photometric observations. The body's rotation period, poles and shape remain unknown.[1][6]

Naming

This minor planet was named "Caelumnoctu" (Latin for The Sky at Night) in honour of the BBC television programme which celebrated its 50th anniversary in 2007. The number "57424" refers to the date of the first broadcast, 24 April 1957.[2]

The official naming citation was published by the Minor Planet Center on 2 April 2007 (M.P.C. 59387).[7]

References

External links

• Asteroid Lightcurve Database (LCDB), query form (info Archived 2017-12-16 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 (55001)-(60000) – Minor Planet Center
• 57424 Caelumnoctu at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

На других языках

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[de] (57424) Caelumnoctu

(57424) Caelumnoctu ist ein Asteroid des äußeren Hauptgürtels, der am 16. September 2001 an der Lincoln Laboratory Experimental Test Site (ETS) (IAU-Code 704) in Socorro, New Mexico im Rahmen des Projektes Lincoln Near Earth Asteroid Research (LINEAR) entdeckt wurde. Sichtungen des Asteroiden hatte es schon vorher gegeben, zum Beispiel am 26. Januar 1982 unter der vorläufigen Bezeichnung 1982 BV4 am japanischen Kiso-Observatorium.[1]

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- [en] 57424 Caelumnoctu

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