Discovery [1] | |
---|---|
Discovered by | R. Luther |
Discovery site | Düsseldorf Obs. |
Discovery date | 13 August 1861 |
Designations | |
(71) Niobe | |
Pronunciation | /ˈnaɪəbiː/ [2] |
Named after | Νιόβη Niobē(Greek mythology) [3] |
main-belt [1] [4] ·(middle) Gallia [5] | |
Adjectives | Niobean /naɪəˈbiːən/ [2] |
Orbital characteristics [4] | |
Epoch 23 March 2018 (JD 2458200.5) | |
Uncertainty parameter 0 | |
Observation arc | 154.10 yr (56,286 d) |
Aphelion | 3.2348 AU |
Perihelion | 2.2790 AU |
2.7569 AU | |
Eccentricity | 0.1733 |
4.58 yr (1,672 d) | |
178.02° | |
0° 12m 55.08s / day | |
Inclination | 23.259° |
316.02° | |
266.88° | |
Physical characteristics | |
Mean diameter | 75.87±3.28 km [6] 80.86±0.80 km [7] 83.42±1.7 km [8] 92.75 km (taken) [9] 92.753 km [10] 92.842±0.644 km [11] |
11 h [12] 11.21 h [13] 14.34±0.05 h [14] 14.34 h [15] [14] 14.38±0.02 h [16] 35.5±0.1 h [17] [lower-alpha 1] 35.617948 h [9] 35.81±0.01 h [18] 35.8521±0.0005 h [19] 35.864±0.002 h [20] | |
0.2446 [10] 0.2475±0.0346 [11] 0.3052±0.013 [8] 0.326±0.008 [7] 0.369±0.033 [6] | |
Tholen = S [4] SMASS = Xe [4] · M [11] · A [21] · X [9] B–V = 0.803 [4] U–B = 0.439 [4] | |
7.30 [4] [6] [7] [8] [11] 7.31 [9] 7.31±0.09 [10] [16] | |
Niobe [22] (minor planet designation: 71 Niobe) is a stony Gallia asteroid and relatively slow rotator from the central regions of the asteroid belt, approximately 90 kilometers (56 miles) in diameter. It was discovered by the German astronomer Robert Luther on 13 August 1861, and named after Niobe, a character in Greek mythology. In 1861, the brightness of this asteroid was shown to vary by astronomer Friedrich Tietjen. [23]
Niobe is a member of the Gallia family ( 802 ), a small family of nearly 200 known stony asteroids. [24]
In 2006, it was examined by radar using the Arecibo Observatory radio telescope in Puerto Rico. This was supplemented by optical observations intended to build a lightcurve. The resulting estimated rotation period of 35.6 hours, or 1.48 Earth days, superseded an earlier estimate of the rotation period as 14.3 hours. The radar data produced an estimate of a maximum equatorial diameter of 94 km, which is consistent with earlier estimates based upon infrared data if the shape is assumed to be slightly elongated. [17] [lower-alpha 1]
The rotation period was further refined to 35.864 ± 0.001 hours during observations through 2010. Six stellar occultations of this asteroid between 2004 and 2007 produced chords ranging from 13 to 72 km (8–45 mi), which are statistically consistent with the published maximum diameter estimates. [20]
Cybele, minor planet designation 65 Cybele, is one of the largest asteroids in the Solar System. It is located in the outer asteroid belt. It is thought to be a remnant primordial body. It gives its name to the Cybele group of asteroids that orbit outward from the Sun from the 2:1 orbital resonance with Jupiter. The X-type asteroid has a relatively short rotation period of 6.0814 hours. It was discovered by Wilhelm Tempel in 1861, and named after Cybele, the earth goddess.
Aegle is a carbonaceous asteroid and the namesake of the Aegle family located in the outer regions of the asteroid belt, approximately 170 kilometers in diameter. It was discovered on 17 February 1868, by French astronomer Jérôme Coggia at the Marseille Observatory in southeastern France. The rare T-type asteroid has a rotation period of 13.8 hours and has been observed several times during occultation events. It was named after Aegle ("brightness"), one of the Hesperides from Greek mythology.
Gallia is an asteroid from the central regions of the asteroid belt, approximately 90 kilometers in diameter. It was discovered on 7 August 1875, by the French brothers Paul Henry and Prosper Henry at the Paris, but the credit for this discovery was given to Prosper. It was named after the Latin name for the country of France, Gaul. Based upon its spectrum, it is an unusual G-type asteroid (GU) and a stony S-type asteroid in the Tholen and SMASS classification, respectively.
Belisana is a stony background asteroid from the inner regions of the asteroid belt, approximately 38 kilometers in diameter. It was discovered on 6 November 1877, by Austrian astronomer Johann Palisa at the Austrian Naval Observatory in today's Croatia. The S-type asteroid has a rotation period of 12.32 hours and a rather spherical shape. It was named after the Celtic goddess Belisama (Belisana).
Taurinensis, provisional designation 1903 LV, is a stony asteroid and large Mars-crosser on an eccentric orbit from the inner regions of the asteroid belt, approximately 20 kilometers in diameter. It was discovered on 23 June 1903, by astronomer Max Wolf at the Heidelberg-Königstuhl State Observatory in southwest Germany. The asteroid was named after the Italian city of Turin. It is the 4th-largest Mars-crossing asteroid.
Edith, provisional designation 1903 MH, is a carbonaceous background asteroid from the outer regions of the asteroid belt, approximately 83 kilometers in diameter. It was discovered on 22 September 1903, by American astronomer Raymond Dugan at the Heidelberg-Königstuhl State Observatory in southwest Germany, who named it after his sister Edith Eveleth.
779 Nina is a large background asteroid, approximately 80 kilometers in diameter, located in the central region of the asteroid belt. It was discovered on 25 January 1914, by Russian astronomer Grigory Neujmin(1886-1946) at the Simeiz Observatory on the Crimean peninsula. The metallic X-type asteroid with an intermediate albedo has a rotation period of 11.2 hours. It was named after the discoverer's sister, Nina Neujmina (Tsentilovich) (1889–1971).
1627 Ivar, provisional designation 1929 SH, is an elongated stony asteroid and near-Earth object of the Amor group, approximately 15×6×6 km. It was discovered on 25 September 1929, by Danish astronomer Ejnar Hertzsprung at Leiden Southern Station, annex to the Johannesburg Observatory in South Africa. It was named after Ivar Hertzsprung, brother of the discoverer. 1627 Ivar was the first asteroid to be imaged by radar, in July 1985 by the Arecibo Observatory.
1219 Britta, provisional designation 1932 CJ, is a stony background asteroid from the inner regions of the asteroid belt, approximately 11 kilometers in diameter. It was discovered on 6 February 1932, by German astronomer Max Wolf at the Heidelberg-Königstuhl State Observatory in southern Germany. The likely elongated S-type asteroid has a rotation period of 5.57 hours. Any reference of its name to a person is unknown.
1058 Grubba, provisional designation 1925 MA, is a stony Flora asteroid from the inner regions of the asteroid belt. It was discovered on 22 June 1925, by Soviet–Russian astronomer Grigory Shajn at the Simeiz Observatory on the Crimean peninsula. The S-type asteroid was named for Irish telescope maker Howard Grubb. It has a longer-than average rotation period of 46.30 hours and measures approximately 12 kilometers in diameter.
1084 Tamariwa, provisional designation 1926 CC, is a carbonaceous background asteroid approximately 27 kilometres in diameter from the central regions of the asteroid belt. It was discovered on 12 February 1926, by Soviet astronomer Sergey Belyavsky at the Simeiz Observatory on the Crimean peninsula. The asteroid was named after female paratrooper Tamara Ivanova, who died at an early age.
1095 Tulipa is an Eos asteroid from the outer regions of the asteroid belt. It was discovered by German astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in southwest Germany on 14 April 1926. The assumed S-type asteroid has a rotation period of 2.8 hours and measures approximately 30 kilometers in diameter. It was named after the flower Tulip. Originally, the name was redundantly assigned to Florian asteroid 1449 Virtanen.
1583 Antilochus is a large Jupiter trojan from the Greek camp, approximately 108 kilometers in diameter. It was discovered on 19 September 1950, by Belgian astronomer Sylvain Arend at Uccle Observatory in Belgium, and later named after the hero Antilochus from Greek mythology. The dark D-type asteroid belongs to the 20 largest Jupiter trojans and has a rotation period of 15.9 hours. It forms an asteroid pair with 3801 Thrasymedes.
2797 Teucer is a large Jupiter trojan from the Greek camp, approximately 110 kilometers in diameter. It was discovered on 4 June 1981, by American astronomer Edward Bowell at the Anderson Mesa Station near Flagstaff, Arizona, in the United States. The dark D-type asteroid belongs to the 20 largest Jupiter trojans and has a rotation period of 10.15 hours. It was named after the Greek hero and great archer, Teucer.
3063 Makhaon is a large Jupiter trojan from the Greek camp, approximately 114 kilometers in diameter. It was discovered on 4 August 1983, by Soviet astronomer Lyudmila Karachkina at the Crimean Astrophysical Observatory in Nauchnij, on the Crimean peninsula. The dark D-type asteroid is the principal body of the proposed Makhaon family and belongs to the 20 largest Jupiter trojans having a rotation period of 8.6 hours. It was named after the legendary healer Machaon from Greek mythology.
3737 Beckman, provisional designation 1983 PA, is a stony asteroid and sizable Mars-crosser on an eccentric orbit from the inner regions of the asteroid belt, approximately 14 kilometers in diameter. It was discovered on 8 August 1983, by American astronomer Eleanor Helin at the Palomar Observatory in California. The S-type asteroid has a rotation period of 3.1 hours. It was named for American Chemist Arnold Beckman.
2895 Memnon is a dark Jupiter trojan from the Trojan camp, approximately 56 kilometers in diameter. It was discovered on 10 January 1981, by American astronomer Norman Thomas at Lowell's Anderson Mesa Station near Flagstaff, Arizona, in the United States. The assumed C-type asteroid has a rotation period of 7.5 hours and belongs to the 80 largest Jupiter trojans. It was named after King Memnon from Greek mythology.
3451 Mentor is a large Jupiter trojan from the Trojan camp, approximately 120 kilometers in diameter. It was discovered on 19 April 1984, by Czech astronomer Antonín Mrkos at the Kleť Observatory in the Czech Republic. The uncommon Jovian X-type asteroid is one of the largest Jupiter trojans and has a rotation period of 7.7 hours. It was named after Mentor from Greek mythology. Mentor, a man who was rich in horse at Pedaeus. He was the father of the spearman Imbrius, an ally of the Trojans.
1928 Summa, provisional designation 1938 SO, is a stony asteroid from the inner regions of the asteroid belt, approximately 9 kilometers in diameter.
1208 Troilus is a large and notably inclined Jupiter trojan from the Trojan camp, approximately 103 kilometers in diameter. It was discovered on 31 December 1931, by German astronomer Karl Reinmuth at the Heidelberg Observatory in southern Germany. The unusual F-type asteroid belongs to the largest Jupiter trojans and has a long rotation period of 56.2 hours. It was named after the Trojan prince Troilus, who was killed by Achilles.