Discovery [1] | |
---|---|
Discovered by | T. F. Fric R. J. Gilbrech |
Discovery site | Palomar Obs. |
Discovery date | 11 October 1985 |
Designations | |
(6265) 1985 TW3 | |
1985 TW3 ·1953 RK1 1969 TZ4 ·1979 YG9 1985 VQ1 ·1987 GD1 1990 CX | |
main-belt [1] [2] ·(inner) background [3] | |
Orbital characteristics [2] | |
Epoch 27 April 2019 (JD 2458600.5) | |
Uncertainty parameter 0 | |
Observation arc | 48.42 yr (17,685 d) |
Aphelion | 2.5839 AU |
Perihelion | 1.7476 AU |
2.1658 AU | |
Eccentricity | 0.1931 |
3.19 yr (1,164 d) | |
228.64° | |
0° 18m 33.12s / day | |
Inclination | 4.1152° |
45.173° | |
281.59° | |
Known satellites | 1 (D: 1.16 km ; P: 15.9 h ) [4] [5] |
Physical characteristics | |
Mean diameter | 4.954±0.100 km [6] [7] [8] 5.20±0.22 km [9] |
2.70932±0.00008 h [10] | |
0.285 [9] 0.286 [6] 0.2865 [8] | |
L (SDSS-MOC) [11] | |
13.40 [9] 13.50 [6] [8] 13.6 [1] [2] [12] | |
(6265) 1985 TW3 (provisional designation 1985 TW3) is a background asteroid and binary system from the inner regions of the asteroid belt. It was discovered on 11 October 1985, by astronomer by T. F. Fric and Richard Gilbrech at the Palomar Observatory in California. It is the only minor-planet discovery for these two astronomers. [1] The stony L-type asteroid measures approximately 5 kilometers (3.1 miles) in diameter and has a rotation period of 2.7 hours. [12] Its 1.2-kilometer sized minor-planet moon was discovered in July 2007 and announced the following month. [4]
1985 TW3 is a non-family asteroid from 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 Flora family ( 402 ), a giant asteroid family and the largest family of stony asteroids in the main-belt. [12]
It orbits the Sun in the inner asteroid belt at a distance of 1.7–2.6 AU once every 3 years and 2 months (1,164 days; semi-major axis of 2.17 AU). Its orbit has an eccentricity of 0.19 and an inclination of 4° with respect to the ecliptic. [2] It was first observed as 1953 RK1 at the former Alma-Ata Observatory ( 210 ) in September 1953. The body's observation arc begins with its observation as 1979 YG9 at Crimea–Nauchnij in December 1979, or almost 6 years prior to its official discovery observation at Palomar Observatory. [1]
This minor planet was permanently numbered (6265) by the Minor Planet Center on 17 March 1995 ( M.P.C. 24890–24891). [13] As of 2018, it has not been named. [1]
In the SDSS-based taxonomy, 1985 TW3 is an unusual L-type asteroid. [11]
In June 2010, a rotational lightcurve of 1985 TW3 was obtained from photometric observations by Australian astronomers David Higgins and Julian Oey at the Hunters Hill ( E14 ) and Leura Observatory ( E17 ). Lightcurve analysis gave a well-defined rotation period of 2.70932±0.00008 hours with a brightness variation of 0.35 magnitude ( U=3 ). [10] Several concurring period determinations in the range of 2.7091 to 2.710 hours with an amplitude of 0.26 to 0.36 magnitude were also made between 2007 and 2013 ( U=3/3/3/3-/2 ). [14] [5] [15] [16] [17]
During a previous photometric observation by David Higgins on 15 July 2007, it was revealed that 1985 TW3 is a binary asteroid with a minor-planet moon in its orbit. The discovery was announced on 2 August 2007. [5] The satellite, provisional designation S/2007 (6265) 1, measures approximately 1.16 kilometers. It is separated by 8 km from its primary, orbiting it once every 15 hours and 52 minutes (15.859 hours or 0.6608 days). [4]
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), 1985 TW3 measures between 4.95 and 5.20 kilometers in diameter and its surface has an albedo between 0.285 and 0.287. [6] [7] [8] [9] The Johnston's archive derives a diameter of 4.81 km and 1.16 km for the primary and secondary, respectively, based on an effective WISE-diameter of 4.95 km and using the lower limit of 0.24 for the secondary-to-primary diameter-ratio (Ds/p) determined by David Higgins. [4] [5] Later observation by Higgins and Pravec determined a Ds/p ratio of 0.30 to 0.32, [10] [15] which increases the satellites size by a quarter to a third if all other factors remain unchanged. The Collaborative Asteroid Lightcurve Link assumes a standard albedo for members of the Flora family of 0.24 and calculates a diameter of 5.17 kilometers based on an absolute magnitude of 13.6. [12]
3673 Levy, provisional designation 1985 QS, is a binary Flora asteroid from the inner regions of the asteroid belt, approximately 6 kilometers in diameter. It was discovered on 22 August 1985, by American astronomer Edward Bowell at Lowell's Anderson Mesa Station near Flagstaff, Arizona, United States. The asteroid was named after Canadian astronomer David H. Levy.
6084 Bascom, provisional designation 1985 CT, is a binary Phocaea asteroid from the inner regions of the asteroid belt, approximately 6.3 kilometers in diameter. It was discovered on 12 February 1985, by American astronomer couple Carolyn and Eugene Shoemaker at Palomar Observatory in California. It is named after American geologist Florence Bascom. Its satellite measures approximately 2.3 kilometers and has an orbital period of 43.51 hours.
4029 Bridges, provisional designation 1982 KC1, is a stony asteroid and binary system from the middle regions of the asteroid belt, approximately 8 kilometers in diameter.
29292 Conniewalker (provisional designation 1993 KZ1) is a bright, stony Phocaea asteroid and slow tumbler from the inner regions of the asteroid belt, approximately 4.6 kilometers in diameter. It was discovered on 24 May 1993, by American astronomer Carolyn Shoemaker and Canadian astronomer David Levy at the Palomar Observatory in California, United States.
7369 Gavrilin, provisional designation 1975 AN, is a stony Phocaean asteroid, sizable Mars-crosser, and binary system on an eccentric orbit from the inner regions of the asteroid belt, approximately 5.5 kilometers in diameter. It was discovered on 13 January 1975, by Russian astronomer Tamara Smirnova at the Crimean Astrophysical Observatory in Nauchnyj, on the Crimean peninsula. The assumed S-type asteroid has a long rotation period of 49.1 hours. It was named after Russian composer Valery Gavrilin. The discovery of its 2.4-kilometer sized minor-planet moon was announced in October 2008.
8116 Jeanperrin, provisional designation 1996 HA15, is a Florian asteroid and synchronous binary system from the inner regions of the asteroid belt, approximately 4.8 kilometers (3 miles) in diameter. It was discovered on 17 April 1996, by Belgian astronomer Eric Elst at the La Silla Observatory in northern Chile. The likely stony S-type asteroid has a rotation period of 3.62 hours and a nearly round shape. It was named for French physicist and Nobel laureate Jean Baptiste Perrin. A minor-planet moon, a third the size of its primary, was discovered in 2007.
5333 Kanaya, provisional designation 1990 UH, is a carbonaceous asteroid from the inner regions of the asteroid belt, approximately 14 kilometers in diameter.
2094 Magnitka (prov. designation: 1971 TC2) is a Flora asteroid from the inner regions of the asteroid belt, approximately 12 kilometers (7.5 miles) in diameter. It was discovered on 12 October 1971, at and by the Crimean Astrophysical Observatory in Nauchnyj, on the Crimean peninsula. The discovery has not been attributed to an observing astronomer. It was later named for the city of Magnitogorsk.
3868 Mendoza, provisional designation 4575 P-L is a stony Vestian asteroid and binary system from the inner regions of the asteroid belt, approximately 9 kilometers in diameter. It was discovered on 24 September 1960, by astronomers Cornelis Johannes van Houten, Ingrid van Houten-Groeneveld and Tom Gehrels at Palomar Observatory.
15350 Naganuma, provisional designation 1994 VB2, is a stony background asteroid from the inner regions of the asteroid belt, approximately 4.3 kilometers (2.7 miles) in diameter. It was discovered on 3 November 1994, by Japanese astronomers Yoshio Kushida and Osamu Muramatsu at the Yatsugatake South Base Observatory. The likely S-type asteroid has a rotation period of 2.5 hours. It was named for the town of Naganuma in northern Japan.
1857 Parchomenko, provisional designation 1971 QS1, is a stony asteroid and suspected binary from the inner regions of the asteroid belt, approximately 8 kilometers in diameter.
1830 Pogson, provisional designation 1968 HA, is a stony Florian asteroid and an asynchronous binary system from the inner regions of the asteroid belt, approximately 8 kilometers in diameter. It was discovered on 17 April 1968, by Swiss astronomer Paul Wild at the Zimmerwald Observatory near Bern, Switzerland. The S-type asteroid has a rotation period 2.6 of hours. It was named for English astronomer Norman Pogson. The discovery of its 2.5-kilometer sized companion was announced in May 2007.
1405 Sibelius, provisional designation 1936 RE, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 8 kilometers in diameter. It was discovered on 12 September 1936, by Finnish astronomer Yrjö Väisälä at Turku Observatory in Southwest Finland. The asteroid was named after composer Jean Sibelius.
2478 Tokai, provisionally designated 1981 JC, is a stony Florian asteroid and binary system from the inner regions of the asteroid belt, approximately 10 kilometers in diameter. It was discovered on 4 May 1981, by Japanese astronomer Toshimasa Furuta at Tōkai Observatory, Japan. The asteroid was named after the city of Tōkai.
1608 Muñoz, provisional designation 1951 RZ, is a Flora asteroid from the inner regions of the asteroid belt, approximately 6.5 kilometers in diameter. It was discovered on 1 September 1951, by Argentine astronomer Miguel Itzigsohn at the La Plata Astronomical Observatory, in La Plata, Argentina. The S-type asteroid has a rotation period of 5.3 hours. It was named after F. A. Muñoz, one of the assistant astronomers at the discovering observatory.
2195 Tengström, provisional designation 1941 SP1, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 8 kilometers in diameter. It was discovered on 27 September 1941, by Finnish astronomer Liisi Oterma at Turku Observatory in Southwest Finland, and named for Swedish geodesist Erik Tengström.
6181 Bobweber, provisional designation 1986 RW, is a stony asteroid from the inner regions of the asteroid belt, approximately 5 kilometers in diameter. It was discovered on 6 September 1986, by American astronomer Eleanor Helin at the U.S. Palomar Observatory in California, and named after astronomer Robert Weber.
4949 Akasofu, provisional designation 1988 WE, is a stony Flora asteroid from the inner regions of the asteroid belt, approximately 5 kilometers in diameter. It was discovered by Japanese amateur astronomer Takuo Kojima at the YGCO Chiyoda Station in Japan on 29 November 1988. The asteroid was named for Japanese geophysicist Syun-Ichi Akasofu
3982 Kastelʹ, provisional designation 1984 JP1, is a Florian asteroid and a suspected binary system from the inner regions of the asteroid belt, approximately 6.9 kilometers in diameter.
10208 Germanicus, provisional designation 1997 QN1, is a stony Florian asteroid and binary system from the inner regions of the asteroid belt, approximately 3.5 kilometers in diameter.