astro.wikisort.org - Asteroid

1137 Raïssa (prov. designation: 1929 WB) is a stony background asteroid and slow rotator, approximately 22 kilometers (14 miles) in diameter, located in the inner regions of the asteroid belt. It was discovered by Grigory Neujmin at Simeiz Observatory in 1929, and named in memory of Raïssa Maseeva, who worked at the Pulkovo Observatory.[2]

1137 Raïssa

Shape model of Raïssa from its lightcurve
Discovery[1]
Discovered by	G. Neujmin
Discovery site	Simeiz Obs.
Discovery date	27 October 1929
Designations
MPC designation	(1137) Raïssa
Named after	Raïssa Maseeva (Russian astronomer)[2]
Alternative designations	1929 WB · A908 BB A910 TB · A924 JA
Minor planet category	main-belt[3][1] · (inner) background[4][5]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	113.28 yr (41,374 days)
Aphelion	2.6600 AU
Perihelion	2.1865 AU
Semi-major axis	2.4233 AU
Eccentricity	0.0977
Orbital period (sidereal)	3.77 yr (1,378 days)
Mean anomaly	132.76°
Mean motion	0° 15m 40.68s / day
Inclination	4.3162°
Longitude of ascending node	78.455°
Argument of perihelion	277.00°
Physical characteristics
Mean diameter	19.421±0.192 km[6] 20.029±0.132 km[7] 21.21±0.55 km[8] 23.66 km (derived)[9] 23.69±1.1 km[10]
Synodic rotation period	142.79±0.01 h[11]
Pole ecliptic latitude	(222.0°, −66°) (λ1/β1)[5] (40.0°, −77.0°) (λ2/β2)[5]
Geometric albedo	0.1538 (derived)[9] 0.1592±0.015[10] 0.206±0.013[8] 0.2207±0.0712[7] 0.228±0.027[6]
Spectral type	S (assumed)[9] B–V = 0.950[1] U–B = 0.350[1]
Absolute magnitude (H)	10.6[1] · 10.74[8][10] · 10.78[9][7][12]

Discovery

Raïssa was discovered on 27 October 1929, by Soviet astronomer Grigory Neujmin at the Simeiz Observatory on the Crimean peninsula.[3] In the following month, it was independently discovered by German Karl Reinmuth at the Heidelberg Observatory on 21 November 1929.[2] The Minor Planet Center only acknowledges the first discoverer.[3] The asteroid's observation arc begins at the United States Naval Observatory in December 1903, almost 26 years prior to its official discovery observation at Simeiz. Its first identification as A908 BB was made at Heidelberg in January 1908.[3]

Orbit and classification

Raïssa is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements.[4][5] It orbits the Sun in the inner asteroid belt at a distance of 2.2–2.7 AU once every 3 years and 9 months (1,378 days). Its orbit has an eccentricity of 0.10 and an inclination of 4° with respect to the ecliptic.[1]

Naming

This minor planet was named in memory of Raïssa Izrailevna Maseeva (1900–1930), a scientific collaborator who worked at the Pulkovo Observatory. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 106).[2]

Physical characteristics

Raïssa is an assumed stony S-type asteroid.[9]

Slow rotator

In October 2010, a rotational lightcurve of Raïssa was obtained from photometric observations at the Bigmuskie Observatory (B88), Italy, and the Etscorn Campus (719) and Organ Mesa Observatory (G50) in New Mexico, United States. Lightcurve analysis gave a rotation period of 142.79 hours with a brightness variation of 0.56 magnitude (U=3-).[11] Previous observations with a shorter period were superseded.[13][12]

With a rotation period of close to six Earth days, Raïssa is a slow rotator as most asteroids have periods of 20 hours or less. Collaborations of observers located on different longitudes, e.g. in the U.S. and Europe are especially important for asteroids with very long periods. The observers can follow the bodies brightness variation at different starting points and thereby cover parts of the lightcurve that were missed by other observers during their daytime.[11]

Poles

In 2016, a modeled lightcurve using photometric data from various sources gave a concurring period of 143.644±0.005 hours and two spin axis of (222.0°, −66°) and (40.0°, −77.0°) in ecliptic coordinates.[5][14]

Diameter and albedo

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Raïssa measures between 19.421 and 23.69 kilometers in diameter and its surface has an albedo between 0.1592 and 0.228.[6][7][8][10] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.1538 and a diameter of 23.66 kilometers based on an absolute magnitude of 10.78.[9]

References

External links

• Lightcurve Database Query (LCDB), at www.minorplanet.info
• Dictionary of Minor Planet Names, Google books
• Asteroids and comets rotation curves, CdR – Geneva Observatory, Raoul Behrend
• Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
• 1137 Raïssa at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 1137 Raïssa at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

На других языках

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[de] (1137) Raïssa

(1137) Raïssa ist ein Asteroid des Hauptgürtels, der am 27. Oktober 1929 vom russischen Astronomen Grigori Nikolajewitsch Neuimin in Simejis entdeckt wurde.

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- [en] 1137 Raïssa

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[ru] (1137) Раиса

(1137) Раиса (нем. Raïssa) — астероид из группы главного пояса. Он был открыт 27 октября 1929 года в Симеизской обсерватории советским астрономом Григорием Неуйминым. Назван в честь сотрудницы Пулковской обсерватории Раисы Израилевны Масеевой[1][2], вычислившей орбиту астероида. Независимо был открыт 21 ноября 1929 года немецким астрономом Карлом Райнмутом в обсерватории Хайдельберг. Свой полный оборот вокруг Солнца астероид совершает за 3,773 юлианских года.

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