2046 Leningrad

2046 LeningradDiscovery [1]

Discovered by| T. Smirnova
Discovery site| Crimean Astrophysical Obs.
Discovery date| 22 October 1968
Designations

MPC designation

| (2046) Leningrad

Named after

| Saint Petersburg
(Russian city)[2]

Alternative designations

| 1968 UD1 * 1929 VK
1934 RK * 1940 UF
1955 HN * 1957 YV
1973 QS * 1973 SH3

Minor planet category

| main-belt * Themis [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc| 87.51 yr (31,964 days)
Aphelion| 3.7227 AU
Perihelion| 2.5902 AU

Semi-major axis

| 3.1565 AU
Eccentricity| 0.1794

Orbital period (sidereal)

| 5.61 yr (2,048 days)

Mean anomaly

| 288.85°

Mean motion

| 0° 10m 32.88s / day
Inclination| 2.7356°

Longitude of ascending node

| 73.570°

Argument of perihelion

| 284.26°
Physical characteristics
Dimensions| 23.55 km (calculated)[3]
23.968±0.292 km[4][5]
27.67±0.67 km[6]

Synodic rotation period

| 5.296±0.003 h[7]

Geometric albedo

| 0.060±0.003[6]
0.08 (assumed)[3]
0.085±0.017[4][5]

Spectral type

| C [3]

Absolute magnitude (H)

| 11.15±0.23[8] * 11.4[4] * 11.5[1][3][6]

2046 Leningrad, provisional designation 1968 UD1, is a carbonaceous Themistian asteroid from the outer regions of the asteroid belt, approximately 24 kilometers in diameter. It was discovered on 22 October 1968, by Soviet astronomer Tamara Smirnova at the Crimean Astrophysical Observatory in Nauchnij, on the Crimean peninsula.[9] The asteroid was named for the Soviet city of Leningrad (now St. Petersburg).[2]

## Orbit and classification[edit]

Leningrad is a member of the Themis family, a dynamical family of carbonaceous asteroids with nearly coplanar ecliptical orbits, located in the outer-belt main. It orbits the Sun at a distance of 2.6–3.7 AU once every 5 years and 7 months (2,048 days). Its orbit has an eccentricity of 0.18 and an inclination of 3° with respect to the ecliptic.[1]

The body's observation arc begins 39 years prior to its official discovery observation, with a precovery taken at Lowell Observatory in October 1929. One week later, the asteroid was identified as 1929 VK at Lowell Observatory.[9]

### Lightcurves[edit]

In August 2012, a rotational lightcurve of Leningrad was obtained from photometric observations by astronomers at the Oakley Southern Sky Observatory (E09). Lightcurve analysis gave a rotation period of 5.296 hours with a brightness variation of 0.11 magnitude (U=2+).[7]

### Diameter and albedo[edit]

According to the surveys carried out by the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Leningrad measures 23.968 and 27.67 kilometers in diameter and its surface has an albedo of 0.060 and 0.085, respectively.[4][5][6]

The Collaborative Asteroid Lightcurve Link assumes a standard albedo for Themistian asteroids of 0.08 and calculates a diameter of 23.55 kilometers based on an absolute magnitude of 11.5.[3]

## Naming[edit]

This minor planet was named for Saint Petersburg, the second largest city of Russia after Moscow. During the Soviet Union, the city was named "Leningrad" between 1924 and 1991. It was also called Petrograd during 1914–1924.[2] The approved naming citation was published by the Minor Planet Center on 1 April 1980 (M.P.C. 5282).[10]

## References[edit]

1. ^ a b c d "JPL Small-Body Database Browser: 2046 Leningrad (1968 UD1)" (2017-05-04 last obs.). Jet Propulsion Laboratory. Retrieved 29 June 2017.
2. ^ a b c Schmadel, Lutz D. (2007). "(2046) Leningrad". Dictionary of Minor Planet Names – (2046) Leningrad. Springer Berlin Heidelberg. p. 166\. doi:10.1007/978-3-540-29925-7_2047. ISBN 978-3-540-00238-3.
3. ^ a b c d e f "LCDB Data for (2046) Leningrad". Asteroid Lightcurve Database (LCDB). Retrieved 29 June 2017.
4. ^ a b c d Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90.
5. ^ a b c Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 29 June 2017.
6. ^ a b c d Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. (online, AcuA catalog p. 153)
7. ^ a b Simpson, Gary; Chong, Elena; Gerhardt, Michael; Gorsky, Sean; Klaasse, Matthew; Kodalen, Brian; et al. (July 2013). "Asteroid Lightcurve Analysis at the Oakley Southern Sky Observatory: 2012 August - October". The Minor Planet Bulletin. 40 (3): 146–151. Bibcode:2013MPBu...40..146S. ISSN 1052-8091. Retrieved 29 June 2017.
8. ^ Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 29 June 2017.
9. ^ a b "2046 Leningrad (1968 UD1)". Minor Planet Center. Retrieved 29 June 2017.
10. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 29 June 2017.

## External links[edit]

* Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
* Dictionary of Minor Planet Names, Google books
* Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
* Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
* 2046 Leningrad at AstDyS-2, Asteroids—Dynamic Site
* Ephemeris * Observation prediction * Orbital info * Proper elements * Observational info
* 2046 Leningrad at the JPL Small-Body Database
* Close approach * Discovery * Ephemeris * Orbit diagram * Orbital elements * Physical parameters

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