1484 Postrema

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1484 Postrema
001484-asteroid shape model (1484) Postrema.png
Shape model of Postrema from its lightcurve
Discovery [1]
Discovered by G. Neujmin
Discovery site Simeiz Obs.
Discovery date29 April 1938
Designations
(1484) Postrema
Pronunciation /pɒˈstriːmə/
Named after
postrēma [2]
("the last of a group")
1938 HC ·1933 DH
A911 KC
main-belt  ·(middle)
Postrema [3]
Adjectives Postremian
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 84.61 yr (30,903 days)
Aphelion 3.2973 AU
Perihelion 2.1816 AU
2.7394 AU
Eccentricity 0.2036
4.53 yr (1,656 days)
194.22°
0° 13m 2.64s / day
Inclination 17.300°
72.767°
126.82°
Physical characteristics
Dimensions34.696±1.954 km [4]
38.82±6.78 km [5]
40.871±0.279 km [6]
41±4 km [7]
41.1±8.2 km [8]
41.73±12.60 km [9]
43.18±1.0 km [10]
43.42 km (derived) [11]
47.00±0.62 km [12]
12.18978±0.00001 h [13]
12.19±0.02 h [14]
12.1923±0.0005 h [15]
0.0137±0.001 [10]
0.015±0.009 [6]
0.035±0.001 [12]
0.0367±0.0074 [4]
0.0409 (derived) [11]
0.05±0.01 [7]
0.05±0.02 [8] [5]
0.05±0.04 [9]
SMASS = B [1] [11]
10.80 [7] [8] [9]  ·10.88 [5]  ·10.90 [1] [11] [12]  ·12.10 [4] [10]

    1484 Postrema, provisional designation 1938 HC, is a carbonaceous Postremian asteroid and namesake of the Postrema family from the central regions of the asteroid belt, approximately 41 kilometers in diameter. It was discovered on 29 April 1938, by Soviet astronomer Grigory Neujmin at the Simeiz Observatory on the Crimean peninsula. [16] The name "Postrema" celebrates the astronomer's last minor planet discovery. [2]

    Contents

    Orbit and classification

    Postrema is the parent body and namesake of the Postrema family ( 541 ), [3] a mid-sized central asteroid family of little more than 100 members. [17] : 23 

    It orbits the Sun in the central main-belt at a distance of 2.2–3.3  AU once every 4 years and 6 months (1,656 days). Its orbit has an eccentricity of 0.20 and an inclination of 17° with respect to the ecliptic. [1]

    The asteroid was first identified as A911 KC at Johannesburg Observatory in May 1911. The body's observation arc begins with its identification as 1933 DH at Lowell Observatory in February 1933, more than 5 years prior to its official discovery observation at Simeiz. [16]

    Physical characteristics

    Spectral type

    In the SMASS classification, Postrema is a bright carbonaceous B-type asteroid, [1] while the overall spectral type of the Postrema family has been described as that of C- and X-type. [17] : 23 

    Rotation period

    In May 2006, two rotational lightcurves of Postrema were independently obtained from photometric observations. Lightcurve analysis gave a rotation period of 12.19 and 12.1923 hours with a brightness amplitude of 0.23 and 0.22 magnitude, respectively ( U=2+/3- ). [14] [15]

    Spin axis

    The asteroids lightcurve has also been modeled, using photometric data from the Lowell Photometric Database and other sources. Modelling gave a concurring period of 12.18978 hours, as well as two spin axis of (19.0°, 44°) and (250.0°, 64°) in ecliptic coordinates (λ, β). [13]

    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, Postrema measures between 34.696 and 47.00 kilometers in diameter and its surface has a notably low albedo between 0.0137 and 0.05. [4] [5] [6] [7] [8] [9] [10] [12]

    The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0409 and a diameter of 43.42 kilometers based on an absolute magnitude of 10.9. [11]

    Naming

    This minor planet was named "Postrema", which means "the last of a group". It celebrates Grigory Neujmin's last numbered minor planet discovery. The official naming citation was published by the Minor Planet Center in June 1955 ( M.P.C. 1252). [18]

    The citation only holds true at the time of publication. In retrospect, Postrema is not Neujmin's last discovery, neither by number nor by its discovery date. These would be the asteroids 4420 Alandreev (highest numbered) and 2536 Kozyrev, officially discovered on 15 August 1939, more than a year after Postrema. [2]

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    1743 Schmidt, provisional designation 4109 P-L, is a dark background asteroid from the inner regions of the asteroid belt, approximately 19 kilometers in diameter. It was discovered during the Palomar–Leiden survey on 24 September 1960, by astronomers Ingrid and Cornelis van Houten at Leiden, on photographic plates taken by Tom Gehrels at Palomar Observatory in California. The C-type asteroid has a rotation period of 17.5 hours. It was named for the optician Bernhard Schmidt.

    <span class="mw-page-title-main">1135 Colchis</span>

    1135 Colchis ; prov. designation: 1929 TA) is a background asteroid from the central region of the asteroid belt. It was discovered on 3 October 1929, by Soviet astronomer Grigory Neujmin at the Simeiz Observatory on the Crimean peninsula. The X-type asteroid has a rotation period of hours 23.5 and measures approximately 49 kilometers in diameter. It was named for the ancient Kingdom of Colchis.

    <span class="mw-page-title-main">1110 Jaroslawa</span>

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    <span class="mw-page-title-main">1129 Neujmina</span>

    1129 Neujmina is an Eos asteroid from the outer regions of the asteroid belt. It was discovered on 8 August 1929, by astronomer Praskoviya Parchomenko at the Simeiz Observatory on the Crimean peninsula. The stony S-type asteroid has a rotation period of 5.1 hours and measures approximately 34 kilometers in diameter. It was named after Soviet astronomer Grigory Neujmin.

    <span class="mw-page-title-main">1137 Raïssa</span>

    1137 Raïssa is a stony background asteroid and slow rotator, approximately 22 kilometers 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.

    <span class="mw-page-title-main">1147 Stavropolis</span>

    1147 Stavropolis is a stony background asteroid from the inner regions of the asteroid belt. It was discovered on 11 June 1929, by Georgian–Russian astronomer Grigory Neujmin at the Simeiz Observatory on the Crimean peninsula. The S-type asteroid has a rotation period of 5.7 hours and measures approximately 14 kilometers in diameter. It was named after the Russian city of Stavropol.

    1151 Ithaka, provisional designation 1929 RK, is a carbonaceous asteroid from the inner regions of the asteroid belt, approximately 14 kilometers in diameter. It was discovered by Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in 1929, and later named for the Greek island of Ithaca.

    1307 Cimmeria, provisional designation 1930 UF, is a stony asteroid from the inner regions of the asteroid belt, approximately 10 kilometers in diameter. It was discovered on 17 October 1930, by Soviet astronomer Grigory Neujmin at Simeiz Observatory on the Crimean peninsula, and later named after the Cimmerians, the ancient people of Crimea.

    <span class="mw-page-title-main">1188 Gothlandia</span>

    1188 Gothlandia, provisional designation 1930 SB, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 12 kilometers in diameter. Discovered by astronomer Josep Comas i Solà at the Fabra Observatory in 1930, the asteroid was later named after the ancient name of the Spanish autonomous community of Catalonia.

    1309 Hyperborea is a carbonaceous background asteroid from the outermost regions of the asteroid belt, approximately 57 kilometers in diameter. It was discovered on 11 October 1931, by Soviet astronomer Grigory Neujmin at the Simeiz Observatory on the Crimean peninsula, and given the provisional designation 1931 TO. The asteroid was named after Hyperborea, the northern homeland of a Greek mythical race of giants.

    1271 Isergina, provisional designation 1931 TN, is a carbonaceous background asteroid from the outer regions of the asteroid belt, approximately 45 kilometers in diameter. It was discovered on 10 October 1931, by Soviet astronomer Grigory Neujmin at the Simeiz Observatory on the Crimean peninsula. The asteroid was named after Crimean physician and friend of the discoverer, Pyotr Isergin.

    <span class="mw-page-title-main">1379 Lomonosowa</span>

    1379 Lomonosowa is a stony background asteroid from the central regions of the asteroid belt, approximately 19 kilometers in diameter. Discovered by Grigory Neujmin at the Simeiz Observatory in 1936, the asteroid was later named after Russian physicist and astronomer Mikhail Lomonosov.

    <span class="mw-page-title-main">1332 Marconia</span>

    1332 Marconia, provisional designation 1934 AA, is a dark asteroid and the parent body of the Marconia family located in the outer regions of the asteroid belt. It measures approximately 46 kilometers in diameter. The asteroid was discovered on 9 January 1934, by Italian astronomer Luigi Volta at the Observatory of Turin in Pino Torinese, northern Italy. It was named for Italian electrical engineer Guglielmo Marconi. The uncommon L-type asteroid has a rotation period of 19.2 hours.

    2043 Ortutay, provisional designation 1936 TH, is a dark asteroid from the outer regions of the asteroid belt, approximately 45 kilometers in diameter. The asteroid was discovered by Hungarian astronomer György Kulin at the Konkoly Observatory, Budapest, on 12 November 1936. It was named after Hungarian ethnographer Gyula Ortutay.

    <span class="mw-page-title-main">1436 Salonta</span>

    1436 Salonta, provisional designation 1936 YA, is a dark background asteroid from the outer regions of the asteroid belt, approximately 60 kilometers in diameter. Discovered by György Kulin at the Konkoly Observatory in 1936, the asteroid was later named for the Romanian city of Salonta, the birthplace of the discoverer.

    1306 Scythia, provisional designation 1930 OB, is a dark Ursula asteroid from the outer regions of the asteroid belt, approximately 72 kilometers in diameter. It was discovered on 22 July 1930, by Soviet astronomer Grigory Neujmin at the Simeiz Observatory on the Crimean peninsula. The asteroid was named for the historic region of Scythia.

    <span class="mw-page-title-main">1493 Sigrid</span>

    1493 Sigrid, provisional designation 1938 QB, is a dark Nysian asteroid from the inner regions of the asteroid belt, approximately 24 kilometers in diameter. It was discovered on 26 August 1938, by Belgian astronomer Eugène Delporte at the Royal Observatory of Belgium in Uccle. It was named after Sigrid Strömgren, wife of astronomer Bengt Strömgren.

    1692 Subbotina, provisional designation 1936 QD, is a dark background asteroid from the central region of the asteroid belt, approximately 37 kilometers in diameter. The carbonaceous Cg-type asteroid has a rotation period of 9.2 hours. It was discovered by Grigory Neujmin at the Crimean Simeiz Observatory in 1936, and later named after Soviet mathematician and astronomer Mikhail Subbotin.

    1266 Tone is a dark background asteroid from the outer regions of the asteroid belt, approximately 80 kilometers in diameter. Discovered by astronomer Okuro Oikawa at the Tokyo Observatory in 1927, it was assigned the provisional designation 1927 BD. The asteroid was later named after the Tone River, one of Japan's largest rivers.

    <span class="mw-page-title-main">1407 Lindelöf</span>

    1407 Lindelöf, provisional designation 1936 WC, is an asteroid from the central region of the asteroid belt, approximately 20 kilometers in diameter. It was discovered on 21 November 1936, by Finnish astronomer Yrjö Väisälä at Turku Observatory in Southwest Finland. The asteroid was named after Finnish topologist Ernst Lindelöf.

    References

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