astro.wikisort.org - Asteroid

760 Massinga (prov. designation: A913 QD or 1913 SL) is a large background asteroid from the outer regions of the asteroid belt, approximately 70 kilometers (43 miles) in diameter. It was discovered by German astronomer Franz Kaiser at the Heidelberg Observatory on 28 August 1913.[1] The stony S-type asteroid has a rotation period of 10.7 hours and is somewhat elongated in shape. It was named in memory of Adam Massinger (1888–1914), a German astronomer at Heidelberg who was killed in World War I.[2]

760 Massinga

Discovery [1]
Discovered by	F. Kaiser
Discovery site	Heidelberg Obs.
Discovery date	28 August 1913
Designations
MPC designation	(760) Massinga
Named after	Adam Massinger (1888–1914) (German astronomer)[2]
Alternative designations	A913 QD · 1941 SL2 1913 SL
Minor planet category	main-belt [1] · (outer)[3] background [4][5][6]
Orbital characteristics [3]
Epoch 31 May 2020 (JD 2459000.5)
Uncertainty parameter 0
Observation arc	106.27 yr (38,816 d)
Aphelion	3.8806 AU
Perihelion	2.4122 AU
Semi-major axis	3.1464 AU
Eccentricity	0.2333
Orbital period (sidereal)	5.58 yr (2,039 d)
Mean anomaly	176.77°
Mean motion	0° 10m 35.76s / day
Inclination	12.539°
Longitude of ascending node	331.55°
Argument of perihelion	200.56°
Physical characteristics
Dimensions	80.2 km × 56.2 km[5]
Mean diameter	69.103±7.046 km[7] 70.03±1.25 km[8] 71.29±1.9 km[9]
Mass	(1.33±1.32)×1018 kg[10]
Synodic rotation period	10.72±0.03 h[11]
Geometric albedo	0.2276±0.012[9] 0.237±0.011[8] 0.360±0.322[7]
Spectral type	Tholen = SU [3] S (S3OS2-TH)[12] SL (S3OS2-BB)[12] B–V = 0.947±0.054[3] U–B = 0.557±0.038[3]
Absolute magnitude (H)	7.9[1][3] 7.96[7][8][9]

Orbit and classification

Massinga 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][6] It orbits the Sun in the outer asteroid belt at a distance of 2.4–3.9 AU once every 5 years and 7 months (2,039 days; semi-major axis of 3.15 AU). Its orbit has an eccentricity of 0.23 and an inclination of 13° with respect to the ecliptic.[3]

Discovery

Massinga was discovered by Franz Kaiser at the Heidelberg-Königstuhl State Observatory in southwest Germany on 28 August 1913. On the same night, it was independently discovered by Russian astronomer Grigory Neujmin at the Simeiz Observatory on the Crimean peninsula. The Minor Planet Center, however, only credits Franz Kaiser with the discovery. The body's observation arc begins at Heidelberg on 8 November 1914, more than a year after its official discovery observation.[1]

Naming

This minor planet was named after Adam Massinger (1888–1914), a German astronomer and discoverer of minor planets at Heidelberg who died in the First Battle of Ypres during World War I on 21 October 1914. An obituary was published by Max Wolf in the astronomical journal Astronomische Nachrichten.[13] The naming was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 76).[2]

Physical characteristics

In the Tholen classification, Massinga is a common, stony S-type asteroid, though with an unusual spectrum (SU),[3] while in the Tholen- and SMASS-like taxonomic variants of the Small Solar System Objects Spectroscopic Survey (S3OS2), it is an S-type and SL-type, latter which transitions to the uncommon L-type, respectively.[5][12]

Rotation period

In December 1999, a rotational lightcurve of Massinga was obtained from photometric observations by Robert A. Koff at his observatory in Colorado. Lightcurve analysis gave a rotation period of 10.72±0.03 hours with a brightness variation of 0.14±0.02 magnitude (U=3).[11] In March 2006, Laurent Bernasconi and Rui Goncalves determined a similar period of 10.7574±0.0004 hours and an amplitude of 0.12±0.01 magnitude (U=3-).[14]

Diameter and albedo

According to the surveys carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, the Japanese Akari satellite, and the Infrared Astronomical Satellite IRAS, Massinga measures (69.103±7.046), (70.03±1.25) and (71.29±1.9) kilometers in diameter and its surface has an albedo of (0.2276±0.012), (0.237±0.011) and (0.360±0.322), respectively.[7][8][9] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.2392 and a diameter of 71.47 kilometers based on an absolute magnitude of 7.9.[15]

On 29 February 2012, an asteroid occultation of Massinga gave a best-fit ellipse dimension of (80.2 km × 56.2 km), with a high quality rating of 3. These timed observations are taken when the asteroid passes in front of a distant star.[5]

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
• 760 Massinga at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 760 Massinga at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

На других языках

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[de] (760) Massinga

(760) Massinga ist ein Asteroid des Hauptgürtels, der am 8. September 1913 vom deutschen Astronomen Franz Kaiser in Heidelberg entdeckt wurde.

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- [en] 760 Massinga

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[es] (760) Massinga

(760) Massinga es un asteroide perteneciente al cinturón de asteroides descubierto en 1913 por Franz Heinrich Kaiser.

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[ru] (760) Массинга

(760) Массинга (лат. Massinga) — астероид главного пояса, который принадлежит спектральному классу S. Он был открыт 28 августа 1913 года немецким астрономом Францем Кайзером в Гейдельбергской обсерватории и назван в честь немецкого астронома Адама Массингера[2].

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