Discovery [1] | |
---|---|
Discovered by | E. F. Helin |
Discovery site | Palomar Obs. |
Discovery date | 30 January 1992 |
Designations | |
(7187) Isobe | |
Named after | Syuzo Isobe (Japanese astronomer) [2] |
1992 BW ·1985 QC3 | |
main-belt ·(inner) [1] Hungaria [3] [4] | |
Orbital characteristics [1] | |
Epoch 4 September 2017 (JD 2458000.5) | |
Uncertainty parameter 0 | |
Observation arc | 30.61 yr (11,182 days) |
Aphelion | 2.1048 AU |
Perihelion | 1.7700 AU |
1.9374 AU | |
Eccentricity | 0.0864 |
2.70 yr (985 days) | |
251.94° | |
0° 21m 55.8s / day | |
Inclination | 21.784° |
315.32° | |
86.408° | |
Known satellites | 1 (likely) [4] [5] |
Physical characteristics | |
Dimensions | 3.85 km (calculated) [4] 4.85±1.43 km [6] 5.421±1.086 km [7] 6.05±1.46 km [8] |
2.440±0.002 h [9] 2.58±0.01 h [10] 4.241±0.006 h [11] 4.2427±0.002 h [5] 4.2432±0.0005 h [12] | |
0.093±0.027 [13] 0.12±0.09 [6] 0.134±0.104 [8] 0.167±0.094 [7] 0.3 (assumed) [4] | |
E [4] | |
13.89 [8] ·13.90 [7] ·14.0 [1] [4] ·14.50 [6] | |
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. [3] It is named after Japanese astronomer Syuzo Isobe. [2]
The presumed E-type asteroid is a member of the Hungaria family, which form the innermost dense concentration of asteroids in the Solar System. [3] [4] Isobe orbits the Sun in the inner main-belt at a distance of 1.8–2.1 AU once every 2 years and 8 months (985 days). Its orbit has an eccentricity of 0.09 and an inclination of 22° with respect to the ecliptic. [1] It was first identified as 1985 QC3 at the discovery observatory in 1985, extending the body's observation arc by 7 years prior to its official discovery observation. [3]
According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Isobe measures between 4.85 and 6.05 kilometers in diameter, and its surface has an albedo between 0.12 and 0.167. [6] [7] [8] The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.30 – a compromise value between 0.4 and 0.2, corresponding to the Hungaria asteroids both as family and orbital group – and calculates a diameter of 3.85 kilometers with an absolute magnitude of 14.0. [4]
Since August 2004, American astronomer Brian Warner obtained several rotational lightcurves of Isobe at his Palmer Divide Observatory in Colorado. Light curve and follow-up analysis gave a well-defined rotation period of 4.2432 hours with a brightness amplitude of 0.22 magnitude ( U=3 ), after initial photometric observations indicated a shorter period solution of 2.4 hours. [5]
In 2012, observations by Brian Warner also indicated that Isobe is very likely a synchronous binary asteroid, orbited by a minor-planet moon every 33 hours. The size of this satellite remains unknown and no secondary-to-primary diameter ratio has been published. Isobe's binary nature still needs further observations.
Isobe was also observed by American astronomer Robert Stephens at the Center for Solar System Studies in September 2015, giving a period of 4.241 hours with an amplitude of 0.22 magnitude. However, no mutual occultation events have been found during the two-night long observation period ( U=3- ). [11]
The asteroid has been named after Syuzo Isobe (born 1942), a Japanese scientist at NAOJ, individual member of the IAU, and president of the Japan Spaceguard Association. He significantly contributed in establishing the Bisei Spaceguard Center, an observatory designed for the observation of NEOs and earth-orbiting space debris. [2] [14] The approved naming citation was published by the Minor Planet Center on 1 November 2001 ( M.P.C. 43762). [15]
2001 Einstein is a bright Hungaria asteroid from the innermost region of the asteroid belt. It was discovered by Swiss astronomer Paul Wild at Zimmerwald Observatory near Bern, Switzerland, on 5 March 1973. The X-type asteroid (Xe) has a rotation period of 5.5 hours and measures approximately 5 kilometers in diameter. It is named after physicist Albert Einstein (1879–1955).
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.
4031 Mueller, provisional designation 1985 CL, is a Hungaria asteroid from the inner regions of the asteroid belt, approximately 4 kilometers in diameter. It was discovered on 12 February 1985, by American astronomer Carolyn Shoemaker at Palomar Observatory, California, and named after astronomer Jean Mueller.
3225 Hoag, provisional designation 1982 QQ, is a dynamical Hungaria asteroid from the innermost regions of the asteroid belt, approximately 5.5 kilometers in diameter. It was discovered on 20 August 1982, by American astronomer couple Carolyn and Eugene Shoemaker at the Palomar Observatory in California. The stony S/L-type asteroid has a short rotation period of 2.37 hours. It was named for American astronomer Arthur Hoag.
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.
5806 Archieroy, provisional designation 1986 AG1, is a stony Hungaria asteroid from the inner regions of the asteroid belt, approximately 6 kilometers in diameter. It was discovered on 11 January 1986, by American astronomer Edward Bowell at Lowell's Anderson Mesa Station near Flagstaff, Arizona. It is named after Scottish astrophysicist Archie Roy.
6296 Cleveland, provisional designation 1988 NC, is a Hungaria asteroid from the innermost regions of the asteroid belt, approximately 3.5 kilometers in diameter. It was discovered on 12 July 1988, by American astronomer Eleanor Helin at the Palomar Observatory in California. The presumed E-type asteroid has a long rotation period of 30.8 hours and possibly an elongated shape. It was named for the city of Cleveland in the U.S. state of Ohio.
1453 Fennia, provisional designation 1938 ED1, is a stony Hungaria asteroid and synchronous binary system from the innermost regions of the asteroid belt, approximately 7 kilometers in diameter. Discovered by Yrjö Väisälä at the Turku Observatory in 1938, the asteroid was later named after the Nordic country of Finland. The system's minor-planet moon was discovered in 2007. It has a derived diameter of 1.95 kilometers and is orbiting its primary every 23.55 hours.
3854 George, provisional designation: 1983 EA, is a stony Hungaria asteroid and Mars-crosser from the innermost regions of the asteroid belt, approximately 3.5 kilometers in diameter. It was discovered on 13 March 1983, by American astronomer couple Carolyn and Eugene Shoemaker at the Palomar Observatory in California. The unlikely synchronous binary system has a rotation period of 3.3 hours. It was named after the discoverer's father-in-law, George Shoemaker.
3353 Jarvis, or by its provisional designation, 1981 YC, is a carbonaceous Hungaria asteroid, slow rotator and suspected tumbler from the inner regions of the asteroid belt, approximately 10 kilometers in diameter.
3800 Karayusuf, provisional designation 1984 AB, is a Mars-crossing asteroid and suspected binary system from inside the asteroid belt, approximately 2.5 kilometers in diameter. It was discovered on 4 January 1984, by American astronomer Eleanor Helin at the Palomar Observatory in California. The S/L-type asteroid has a short rotation period of 2.2 hours. It was named after Syrian physician Alford Karayusuf, a friend of the discoverer.
1384 Kniertje, provisional designation 1934 RX, is a dark Adeonian asteroid from the central regions of the asteroid belt, approximately 26 kilometers in diameter. It was discovered on 9 September 1934, by Dutch astronomer Hendrik van Gent at the Union Observatory in Johannesburg, South Africa. The asteroid was named after a character in the Dutch play Op Hoop van Zegen by Herman Heijermans.
4868 Knushevia, provisional designation 1989 UN2 is a bright Hungaria asteroid and suspected binary system from the innermost regions of the asteroid belt, approximately 2 kilometers in diameter. It was discovered on 27 October 1989, by American astronomer Eleanor Helin at the Palomar Observatory in California, United States. The asteroid was named for the Kyiv University in Ukraine.
3873 Roddy, provisional designation 1984 WB, is a stony Hungarian asteroid, Mars-crosser and suspected binary system, from the innermost regions of the asteroid belt, approximately 7 kilometers in diameter. It was discovered on 21 November 1984, by American astronomer Carolyn Shoemaker at the Palomar Observatory in California, United States. It was named after American astrogeologist David Roddy.
2074 Shoemaker, provisional designation 1974 UA, is a stony Hungaria asteroid, Mars-crosser and suspected synchronous binary system from the innermost regions of the asteroid belt, approximately 4 kilometers in diameter. It was discovered on 17 October 1974, by astronomer Eleanor Helin at the Palomar Observatory. She named it after American astronomer Eugene Shoemaker.
2047 Smetana, provisional designation 1971 UA1, is a bright Hungaria asteroid and synchronous binary system from the innermost regions of the asteroid belt, approximately 3.5 kilometers in diameter. It was discovered on 26 October 1971, by Czech astronomer Luboš Kohoutek at Bergedorf Observatory in Hamburg, Germany. The asteroid was named after Czech composer Bedřich Smetana. Its sub-kilometer sized minor-planet moon was discovered in 2012.
2120 Tyumenia is a dark background asteroid, approximately 45 kilometers in diameter, located in the outer regions of the asteroid belt. It was discovered on 9 September 1967, by Soviet astronomer Tamara Smirnova at the Crimean Astrophysical Observatory in Nauchnyj, on the Crimean peninsula. The asteroid was named for the now Russian district of Tyumen Oblast in Western Siberia.
1600 Vyssotsky, provisional designation 1947 UC, is a rare-type Hungaria asteroid and suspected interloper from the inner regions of the asteroid belt, approximately 7 kilometers in diameter. It was discovered on 22 October 1947, by American astronomer Carl Wirtanen at Lick Observatory in California, United States. It was named after astronomer Alexander Vyssotsky.
8026 Johnmckay, provisional designation 1991 JA1, is a binary Hungaria asteroid and very slow rotator from the inner regions of the asteroid belt, approximately 2 kilometers in diameter. It was discovered on 8 May 1991, by American astronomer Eleanor Helin at the U.S. Palomar Observatory, California, and later named for NASA test pilot John B. McKay.
20936 Nemrut Dagi, provisional designation: 4835 T-1, is a stony Hungaria asteroid and Mars-grazer from the innermost regions of the asteroid belt, approximately 3.5 kilometers in diameter. It was discovered on 13 May 1971, by Dutch astronomer couple Ingrid and Cornelis van Houten at Leiden, on photographic plates taken by Dutch–American astronomer Tom Gehrels at Palomar Observatory in California, United States. The asteroid has a rotation period of 3.28 hours, a likely spheroidal shape, and a high albedo typically seen among the enstatite-rich E-type asteroids. In 2012, it was named after the a dormant volcano Nemrut in Turkey.