Discovery [1] | |
---|---|
Discovered by | E. Bowell |
Discovery site | Anderson Mesa Stn. |
Discovery date | 15 April 1985 |
Designations | |
(4175) Billbaum | |
Named after | William A. Baum [1] (American astronomer) |
1985 GX ·1974 UE 1978 QF2 ·1978 RL4 | |
main-belt [1] [2] ·(middle) background [3] · Eunomia [4] | |
Orbital characteristics [2] | |
Epoch 23 March 2018 (JD 2458200.5) | |
Uncertainty parameter 0 | |
Observation arc | 66.14 yr (24,159 d) |
Aphelion | 3.1831 AU |
Perihelion | 2.1842 AU |
2.6836 AU | |
Eccentricity | 0.1861 |
4.40 yr (1,606 d) | |
239.61° | |
0° 13m 27.12s / day | |
Inclination | 13.612° |
163.41° | |
316.77° | |
Physical characteristics | |
Mean diameter | 8.873±0.278 km [5] 9.60 km(calculated) [4] |
2.730±0.005 h [lower-alpha 1] 2.7425±0.0009 h [6] 2.908±0.001 h [7] | |
0.21(assumed) [4] 0.270±0.038 [5] | |
L [8] · S (assumed) [4] | |
11.96±0.72 [8] 12.30 [5] 12.4 [2] [4] | |
4175 Billbaum, provisional designation 1985 GX, is a background asteroid from the central regions of the asteroid belt, approximately 9 kilometers (6 miles) in diameter. It was discovered on 15 April 1985, by American astronomer Edward Bowell at the Anderson Mesa Station of the Lowell Observatory near Flagstaff, Arizona. The uncommon L-type asteroid has a short rotation period of 2.73 hours and was named for American astronomer William A. Baum. [1] [4]
Billbaum is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements. [3] Based on osculating Keplerian orbital elements, the asteroid has also been classified as a member of the Eunomia family ( 502 ), a prominent family of stony S-type asteroid and the largest one in the intermediate main belt with more than 5,000 members. [4]
It orbits the Sun in the central main-belt at a distance of 2.2–3.2 AU once every 4 years and 5 months (1,606 days; semi-major axis of 2.68 AU). Its orbit has an eccentricity of 0.19 and an inclination of 14° with respect to the ecliptic. [2] The body's observation arc begins with a precovery taken at Palomar Observatory in August 1951, almost 34 years prior to its official discovery observation at Anderson Mesa. [1]
Billbaum has been characterized as an uncommon L-type asteroid by Pan-STARRS survey. [8] [4]
In January and February 2011, three rotational lightcurves of Billbaum were obtained from photometric observations by Ralph Megna, Josep Aymami and astronomers at the Oakley Southern Sky Observatory. [6] [7] [lower-alpha 1] Analysis of the best-rated lightcurve gave a short rotation period of 2.73 hours and a consolidated brightness amplitude between 0.08 and 0.15 magnitude ( U=3- ). [4]
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Billbaum measures 8.87 kilometers in diameter and its surface has an albedo of 0.27, [5] while the Collaborative Asteroid Lightcurve Link assumes a stony standard albedo of 0.21, derived from 15 Eunomia, the Eunomia family's parent body – and calculates a diameter of 9.60 kilometers based on an absolute magnitude of 12.4. [4]
This minor planet was named after American astronomer William A. Baum (1924–2012) who was on the directorship of the Lowell Observatory's Planetary Research Center. He also worked on the Hubble Space Telescope. [1] The official naming citation was published by the Minor Planet Center on 28 April 1991 ( M.P.C. 18139). [9]
971 Alsatia, provisional designation 1921 LF, is a carbonaceous background asteroid from the central region of the asteroid belt, approximately 60 kilometers in diameter. It was discovered on 23 November 1921, by French astronomer Alexandre Schaumasse at Nice Observatory in southeastern France. The asteroid was named after the French province Alsace.
1996 Adams, provisional designation 1961 UA, is a stony Eunomia asteroid from the middle region of the asteroid belt, approximately 13 kilometers in diameter. It was discovered on 16 October 1961, by the Indiana Asteroid Program at Goethe Link Observatory near Brooklyn, Indiana, United States. It was later named after mathematician John Couch Adams.
2023 Asaph, provisional designation 1952 SA, is a dark asteroid from the outer regions of the asteroid belt, approximately 21 kilometers in diameter. It was discovered on 16 September 1952, by astronomers of the Indiana Asteroid Program at Goethe Link Observatory in Indiana, United States.
1019 Strackea, provisional designation 1924 QN, is a stony Hungaria asteroid of the inner asteroid belt, approximately 8 kilometers in diameter. It was discovered on 3 March 1924, by astronomer Karl Reinmuth at Heidelberg Observatory in southwest Germany. It is named for German astronomer Gustav Stracke.
1022 Olympiada, provisional designation 1924 RT, is a background asteroid from the central regions of the asteroid belt, approximately 30 kilometers in diameter. It was discovered at the Simeiz Observatory on the Crimean peninsula on 23 June 1924, by Soviet astronomer Vladimir Albitsky, who named it after his mother, Olimpiada Albitskaya. The X-type asteroid has a short rotation period of 3.83 hours.
1554 Yugoslavia, provisional designation 1940 RE, is a stony Eunomian asteroid from the middle region of the asteroid belt, approximately 16 kilometres (9.9 mi) in diameter. It was discovered by Serbian astronomer Milorad Protić at Belgrade Astronomical Observatory, Serbia, on 6 September 1940. It was named for the former country of Yugoslavia.
1106 Cydonia, provisional designation 1929 CW, is a Eunomian asteroid from the central regions of the asteroid belt, approximately 13 kilometers in diameter. It was discovered on 5 February 1929, by astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in Germany. The asteroid was named for the fruit-bearing tree Cydonia (quince). The S-type asteroid has a relatively short rotation period of 2.7 hours.
5175 Ables, provisional designation 1988 VS4, is a bright Hungaria asteroid from the inner regions of the asteroid belt, approximately 5 kilometers in diameter. It was discovered by American astronomers Carolyn and Eugene Shoemaker at the U.S. Palomar Observatory, California, on 4 November 1988. It was named after American astronomer Harold Ables.
12714 Alkimos is a large Jupiter trojan from the Greek camp, approximately 54 kilometers in diameter. It was discovered on 15 April 1991, by American astronomer couple Carolyn and Eugene Shoemaker at the Palomar Observatory in California. The dark Jovian asteroid has a rotation period of 28.5 hours. It was named from Greek mythology after Alcimus, son of Ares and companion of Achilles.
1985 Hopmann is a dark background asteroid in the outer regions of the asteroid belt. It was discovered on 13 January 1929, by astronomer Karl Reinmuth at Landessternwarte Heidelberg-Königstuhl in southern Germany. The asteroid has a rotation period of 17.5 hours and measures approximately 36 kilometers in diameter. It was later named after German astronomer Josef Hopmann (1890–1975).
7187 Isobe, provisional designation 1992 BW, is a likely binary Hungaria asteroid from the inner regions of the asteroid belt, approximately 5 kilometers in diameter. It was discovered on 30 January 1992, by American astronomer Eleanor Helin at Palomar Observatory in California, United States. It is named after Japanese astronomer Syuzo Isobe.
1361 Leuschneria, provisional designation 1935 QA, is a carbonaceous asteroid from the outer regions of the asteroid belt, approximately 30 kilometers in diameter. It was discovered on 30 August 1935, by Belgian astronomer Eugène Delporte at Uccle Observatory in Belgium, and named after American astronomer Armin Otto Leuschner.
4358 Lynn, provisional designation A909 TF, is a stony Eunomia asteroid from the central region of the asteroid belt, approximately 10 kilometers in diameter. It was discovered by British astronomer Philip Herbert Cowell at the Royal Greenwich Observatory on 5 October 1909. It was named for William Lynn, an assistant astronomer at the discovering observatory.
5542 Moffatt, provisional designation 1978 PT4, is a Marian asteroid from the central regions of the asteroid belt, approximately 9 kilometers (6 miles) in diameter. It was discovered on 6 August 1978, by astronomers at the Perth Observatory in Bickley, Australia. The likely S-type asteroid has a rotation period of 5.19 hours. It was named for Australian Ethelwin Moffatt, a benefactor of the discovering observatory.
1318 Nerina, provisional designation 1934 FG, is a Phocaea asteroid from the inner regions of the asteroid belt, approximately 13 kilometers in diameter. It was discovered on 24 March 1934, by South African astronomer Cyril Jackson at the Union Observatory in Johannesburg. The possibly metallic X-type asteroid has a notably short rotation period of 2.5 hours. It was named for the flowering plant Nerine, also known as "Guernsey lily" or "Jersey lily".
9165 Raup, provisional designation 1987 SJ3, is a stony Hungaria asteroid and exceptionally slow rotator from the inner regions of the asteroid belt, approximately 4.7 kilometers in diameter.
2308 Schilt, provisional designation 1967 JM, is a stony Eunomia asteroid from the asteroid belt, approximately 17 kilometers in diameter. It was discovered on 6 May 1967, by Argentine astronomer Carlos Cesco together with American astronomer Arnold Klemola at the Yale–Columbia Southern Station at Leoncito Astronomical Complex in Argentina.
5692 Shirao, provisional designation 1992 FR, is a stony Eunomia asteroid from the middle region of the asteroid belt, approximately 9 kilometers in diameter. It was discovered on 23 March 1992, by Japanese amateur astronomers Kin Endate and Kazuro Watanabe at Kitami Observatory, Hokkaidō, Japan. The asteroid was later named for Japanese geologist and astrophotographer Motomaro Shirao.
10645 Brač, provisional designation 1999 ES4, is a stony Eunomia asteroid from the central region of the asteroid belt, approximately 10 kilometers in diameter. It was discovered on 14 March 1999, by Croatian astronomer Korado Korlević at Višnjan Observatory, and named after the Croatian island of Brač.
52266 Van Flandern, provisional designation 1986 AD, is a stony Phocaea asteroid from the inner regions of the asteroid belt, approximately 4 kilometers in diameter. It was discovered on 10 January 1986, by American astronomers Carolyn and Eugene Shoemaker at the Palomar Observatory in California, United States. The asteroid was later named for American astronomer Tom Van Flandern.