astro.wikisort.org - Asteroid

1112 Polonia, provisional designation 1928 PE, is an Eoan asteroid from the outer regions of the asteroid belt, approximately 38 kilometers (24 miles) in diameter. Discovered by Soviet astronomer Pelageya Shajn at Simeiz in 1928,[1] it was the first asteroid discovery made by a woman.[3] The L-type asteroid has a long rotation period of 82.5 hours,[6] and was named for the country of Poland.[3]

1112 Polonia

Discovery[1]
Discovered by	P. Shajn
Discovery site	Simeiz Obs.
Discovery date	15 August 1928
Designations
MPC designation	(1112) Polonia
Pronunciation	/poʊˈloʊniə/[2]
Named after	Poland (European country)[3]
Alternative designations	1928 PE · 1933 PA A908 XA
Minor planet category	main-belt[1][4] · (outer) Eos[5][6]
Orbital characteristics[4]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc	89.20 yr (32,582 d)
Aphelion	3.3423 AU
Perihelion	2.6963 AU
Semi-major axis	3.0193 AU
Eccentricity	0.1070
Orbital period (sidereal)	5.25 yr (1,916 d)
Mean anomaly	326.70°
Mean motion	0° 11m 16.44s / day
Inclination	8.9911°
Longitude of ascending node	302.86°
Argument of perihelion	87.361°
Physical characteristics
Mean diameter	35.76±1.6 km[7] 37.55±0.60 km[8] 39.661±0.334 km[9] 47.058±0.368 km[10]
Synodic rotation period	82.5±0.5 h[11][lower-alpha 1]
Geometric albedo	0.0763±0.0097[10] 0.097±0.023[9] 0.128±0.005[8] 0.1319±0.012[7]
Spectral type	S (Tholen)[4] L (SDSS-MOC)[12] B–V = 0.797[4] U–B = 0.447[4]
Absolute magnitude (H)	10.05[4][6][7][8][10]

Discovery

Polonia was first observed as A908 XA at the German Heidelberg Observatory in December 1908. It was officially discovered on 15 August 1928, by Soviet astronomer Pelageya Shajn at the Simeiz Observatory on the Crimean peninsula.[1] On the following night at Simeis, it was independently discovered by her college Grigory Neujmin.[3] The Minor Planet Center only recognized the first discoverer.[1]

Polonia was Shajn's first discovery; and the first asteroid discovery made by a woman,[3] bringing a long-standing tradition – which began with the discovery of 1 Ceres in 1801 – of more than a thousand minor planet discoveries exclusively made by male astronomers, to an end.

Orbit and classification

Polonia is a core member of the Eos family (606),[5][6] the largest asteroid family of the outer main belt consisting of nearly 10,000 asteroids.[13]

It orbits the Sun at a distance of 2.7–3.3 AU once every 5 years and 3 months (1,916 days; semi-major axis of 3.02 AU). Its orbit has an eccentricity of 0.11 and an inclination of 9° with respect to the ecliptic.[4] The body's observation arc begins with its official discovery observation at Simeiz in 1928.[1]

Physical characteristics

In the Tholen classification, Polonia is a common, stony S-type asteroid.[4] In the more refined SDSS-based taxonomy, it is characterized as an uncommon L-type,[12] which is similar to a K-type, the overall spectral type of the Eoan asteroids.[13]^: 23

Rotation period

In October 2007, a rotational lightcurve of Polonia was obtained from photometric observations by American astronomer Brian Warner at his Palmer Divide Observatory in Colorado. Lightcurve analysis gave a long rotation period of 82.5 hours with a brightness amplitude of 0.20 magnitude (U=2).[6][11][lower-alpha 1] The asteroid's long period it is close to that of a slow rotator.

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, Polonia measures between 35.76 and 47.058 kilometers in diameter and its surface has an albedo between 0.0763 and 0.1319.[7][8][9][10] The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.1319 and a diameter of 35.76 kilometers based on an absolute magnitude of 10.05.[6]

Naming

This minor planet was named "Polonia", the Latin name for the European country of Poland. It is the first minor planet discovery made by a woman. The naming was proposed by L. Matkiewicz, an astronomer of Polish origin, who calculated the body's orbit. The official citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 104).[3]

Notes

References

External links

• Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
• Dictionary of Minor Planet Names, Google books
• Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
• 1112 Polonia at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 1112 Polonia at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

На других языках

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[de] (1112) Polonia

(1112) Polonia ist ein Asteroid des Hauptgürtels, der am 15. August 1928 von der russischen Astronomin Pelageja Fjodorowna Schain am Krim-Observatorium in Simejis entdeckt wurde.

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- [en] 1112 Polonia

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[es] (1112) Polonia

(1112) Polonia es un asteroide perteneciente al cinturón de asteroides descubierto el 15 de agosto de 1928 por Pelagueya Fiodórovna Shain desde el observatorio de Simeiz en Crimea. Está nombrado por el nombre en latín de Polonia.[2]

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[ru] (1112) Полония

(1112) Полония (лат. Polonia) — медленновращающийся астероид главного пояса, который принадлежит к светлому спектральному классу S. Он был открыт 15 августа 1928 года советским астрономом Пелагеей Шайн в Симеизской обсерватории и назван в честь Польши[1].

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