astro.wikisort.org - Asteroid

3982 Kastel', provisional designation 1984 JP₁, is a Florian asteroid and a suspected binary system[8] from the inner regions of the asteroid belt, approximately 6.9 kilometers in diameter.

3982 Kastel'

Discovery [1]
Discovered by	L. G. Karachkina
Discovery site	Crimean Astrophysical Obs.
Discovery date	2 May 1984
Designations
MPC designation	(3982) Kastel'
Named after	Galina Ričardovna Kastel' (astronomer)[2]
Alternative designations	1984 JP1 · 1930 MF 1947 NE · 1954 RC 1978 TT5
Minor planet category	main-belt · Flora [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	86.77 yr (31,691 days)
Aphelion	2.7546 AU
Perihelion	1.7625 AU
Semi-major axis	2.2586 AU
Eccentricity	0.2196
Orbital period (sidereal)	3.39 yr (1,240 days)
Mean anomaly	230.45°
Mean motion	0° 17m 25.44s / day
Inclination	5.2970°
Longitude of ascending node	251.91°
Argument of perihelion	50.950°
Physical characteristics
Dimensions	6.790±0.363 km[4][5] 6.90 km (taken)[3] 6.901 km[6]
Synodic rotation period	8.4877±0.0005 h[lower-alpha 1] 8.488±0.003 h[7]
Geometric albedo	0.1695[6] 0.201±0.031[4][5]
Spectral type	P [4] · S [3]
Absolute magnitude (H)	12.9[1] · 13.2[4] · 13.35±0.08[3][6]

It was discovered on 2 May 1984, by Russian astronomer Lyudmila Karachkina at the Crimean Astrophysical Observatory in Nauchnij on the Crimean peninsula.[9] It is named after Soviet astronomer Galina Kastel'.[2]

Classification and orbit

Kastel' is a member of the Flora family, one of the largest families of stony asteroids. It orbits the Sun in the inner main-belt at a distance of 1.8–2.8 AU once every 3 years and 5 months (1,240 days). Its orbit has an eccentricity of 0.22 and an inclination of 5° with respect to the ecliptic.[1] Kastel' was first identified as 1930 MF at Lowell Observatory in 1930, extending the asteroid's observation arc by 54 years prior to its discovery observation.[9]

Physical characteristics

Kastel' has been characterized as a dark and reddish P-type asteroid by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, despite measuring an albedo of 0.20.[4] It is also an assumed S-type asteroid.[3]

Diameter and albedo

According to the survey carried out by NASA's Wide-field Infrared Survey Explorer (WISE) with its subsequent NEOWISE mission, Kastel' measures 6.79 kilometers in diameter and its surface has an albedo of 0.201,[4][5] while Petr Pravec's revised estimates of the thermal WISE observation gave a lower albedo of 0.1695 and consequently a larger diameter of 6.90 kilometers with an absolute magnitude of 13.35.[6]

Lightcurve

In September 2009 and February 2014, two rotational lightcurves were obtained for this asteroid. Lightcurve analysis gave a rotation period of 8.4877 and 8.488 hours with a brightness variation of 0.27 and 0.28 magnitude, respectively (U=n.a.).[7][lower-alpha 1]

Suspected binary

During the first of the two a photometric observations – a collaboration between Czech astronomers Petr Pravec, Peter Kušnirák, Leonard Kornoš and Jozef Világi at Ondřejov Observatory, as well as American astronomers Donald Pray, Russel Durkee, Walter R. Cooney Jr., John Gross and Dirk Terrell at several locations in the United States – it was revealed, that Kastel's lightcurve consisted of two linearly additive components, indicative for the presence of an asteroid moon. However, no attenuations were observed, which typically occur when the primary and secondary body are eclipsing each other.[7] After a second observation in 2014, the binary nature of Kastel' still remains uncertain.[3][8][lower-alpha 1] The "Johnstonsarchive" gives no estimates.[10]

Naming

This minor planet was named in honor of Soviet astronomer Galina Ričardovna Kastel' astronomer at the Institute for Theoretical Astronomy (ITA) at Saint Petersburg (then Leningrad). A discoverer of minor planets herself, she is a known expert of the motions of small Solar System bodies and was involved with astrometric work at the discovering observatory.[2] The approved naming citation was published by the Minor Planet Center on 28 May 1991 (M.P.C. 18306).[11]

Notes

References

External links

• Asteroids with Satellites, Robert Johnston, johnstonsarchive.net
• 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 (1)-(5000) – Minor Planet Center
• 3982 Kastel' at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

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