779 Nina

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779 Nina (prov. designation: Template:Mp or Template:Mp) is a large background asteroid, approximately Script error: No such module "convert". 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.[1] 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).[2]

Orbit and classification

File:Orbit of 779 Nina.gif
Orbital diagram of Nina

Nina is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements.[3][4][5] It orbits the Sun in the central main-belt at a distance of 2.1–3.3 AU once every 4 years and 4 months (1,588 days; semi-major axis of 2.66 AU). Its orbit has an eccentricity of 0.23 and an inclination of 15° with respect to the ecliptic.[6] The body's was first observed as Template:Mp and Template:Mp at Heidelberg Observatory on 16 December 1908 and 14 October 1912, respectively. The observation arc begins at Vienna Observatory on 31 July 1916, more than two years after to its official discovery observation at Simeiz Observatory on Crimea.[1]

Naming

This minor planet was Template:MoMP after Nina Nikolaevna Neujmina (Tsentilovich) (1889–1971), mathematician and sister of Russian discoverer Grigory Neujmin (1886–1946).[2]

Physical characteristics

In the Bus–Binzel SMASS classification, Nina is an X-type asteroid.[6] It is also an X-type in both the Tholen- and SMASS-like taxonomy of the Small Solar System Objects Spectroscopic Survey (S3OS2).[4][7] Belskaya classifies Nina as a metallic M-type asteroid, which is the equivalent spectral type in the Tholen taxonomy for X-types with an intermediate albedo (see below).[8][9]

Rotation period

In June 1981, a rotational lightcurve of Nina was obtained from photometric observations by Alan Harris at the Table Mountain and Lowell observatories. Lightcurve analysis gave a rotation period of Script error: No such module "val". hours with a brightness variation of Script error: No such module "val". magnitude (U=3Script error: No such module "Check for unknown parameters".).[10] It was confirmed by Brian Warner at his Palmer Divide Observatory Template:Obscode in Colorado in January 2009, who determined a period of Script error: No such module "val". hours with an amplitude of Script error: No such module "val". magnitude (U=3Script error: No such module "Check for unknown parameters".).[11]Template:Efn In September 2012, French amateur astronomer Gérald Rousseau obtained a period of Script error: No such module "val". hours with an amplitude of Script error: No such module "val". magnitude (U=2+Script error: No such module "Check for unknown parameters".).[12]

Diameter and albedo

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), and the Japanese Akari satellite, Nina measures (Script error: No such module "val".), (Script error: No such module "val".) and (Script error: No such module "val".) kilometers in diameter and its surface has an albedo of (Script error: No such module "val".), (Script error: No such module "val".) and (Script error: No such module "val".), respectively.[13][14][15] The Collaborative Asteroid Lightcurve Link adopts Petr Pravec's revised WISE-albedo of 0.1694 and takes a diameter of 77.46 kilometers based on an absolute magnitude of 8.1.[9][16] The WISE team also published an alternative mean-diameter of (Script error: No such module "val".) with an albedo of (Script error: No such module "val".).[9] On 10 November 2005, an asteroid occultation of Nina gave a best-fit ellipse dimension of (Script error: No such module "val".), with a quality rating of 2. These timed observations are taken when the asteroid passes in front of a distant star.[4]

Notes

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References

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  1. ↑ a b Script error: No such module "citation/CS1".
  2. ↑ a b Script error: No such module "citation/CS1".
  3. ↑ Script error: No such module "citation/CS1".
  4. ↑ a b c Script error: No such module "citation/CS1".
  5. ↑ Script error: No such module "Citation/CS1". (PDS main page)
  6. ↑ a b Script error: No such module "citation/CS1".
  7. ↑ Script error: No such module "Citation/CS1".
  8. ↑ Script error: No such module "Citation/CS1".
  9. ↑ a b c Script error: No such module "citation/CS1".
  10. ↑ Script error: No such module "Citation/CS1".
  11. ↑ Script error: No such module "Citation/CS1".
  12. ↑ Script error: No such module "citation/CS1".
  13. ↑ Script error: No such module "Citation/CS1".
  14. ↑ Script error: No such module "Citation/CS1".
  15. ↑ Script error: No such module "Citation/CS1". (online, AcuA catalog p. 153)
  16. ↑ Script error: No such module "Citation/CS1".

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External links

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