1791 Patsayev

1791 Patsayev (prov. designation: 1967 RE) is a dark background asteroid from the central region of the asteroid belt, approximately 26 kilometers in diameter. It was discovered on 4 September 1967, by Russian astronomer Tamara Smirnova at the Crimean Astrophysical Observatory in Nauchnyj, on the Crimean peninsula.[8] The asteroid was named after cosmonaut Viktor Patsayev.[2]

1791 Patsayev
Shape model of Patsayev from its lightcurve
Discovery [1]
Discovered byT. Smirnova
Discovery siteCrimean Astrophysical Obs.
Discovery date4 September 1967
Designations
(1791) Patsayev
Named after
Viktor Patsayev (cosmonaut)[2]
1967 RE · 1931 TW3
1943 GS · 1943 GZ
1948 JO · 1948 KA
1957 JG · 1957 KS
1958 RC
main-belt · (middle)
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc84.79 yr (30,970 days)
Aphelion3.1351 AU
Perihelion2.3603 AU
2.7477 AU
Eccentricity0.1410
4.55 yr (1,664 days)
48.980°
0° 12m 59.04s / day
Inclination5.3689°
198.89°
74.431°
Physical characteristics
Dimensions25.69 km (derived)[3]
29.394±0.114 km[4]
29.446±0.287 km[5]
31.50±0.37 km[6]
19.809±0.013 h[7]
0.030±0.004[5]
0.034±0.006[6]
0.0390±0.0076[4]
0.0465 (derived)[3]
C [3]
11.8[4][6] · 11.9[1][3]

    Orbit and classification

    The dark C-type asteroid orbits the Sun in the central main-belt at a distance of 2.4–3.1 AU once every 4 years and 7 months (1,664 days). Its orbit has an eccentricity of 0.14 and an inclination of 5° with respect to the ecliptic.[1] Patsayev was first identified as 1931 TW3 at Lowell Observatory in 1931, extending the body's observation arc by 36 years prior to its official discovery observation.[8]

    Physical characteristics

    Rotation period

    In April 2016, a rotational lightcurve of Patsayev was obtained from photometric observations taken by Sydney Black at the Oakley Southern Sky Observatory in Coonabarabran, Australia. It gave a well-defined rotation period of 19.809 hours with a brightness variation of 0.28 in magnitude (U=3).[7]

    Diameter and albedo

    According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Patsayev measures between 29.39 and 31.50 kilometers in diameter, and its surface has a high albedo between 0.030 and 0.039.[4][5][6] The Collaborative Asteroid Lightcurve Link (CALL) disagrees with the results found by WISE. CALL derives a much lower carbonaceous albedo of 0.046, and calculates a diameter of 25.69 kilometers with an absolute magnitude of 11.9.[3]

    Naming

    This minor planet was named in honor of Russian–Soviet cosmonaut Viktor Patsayev (1933–1971), test Engineer of the Soyuz 11 spacecraft, who died on his first spaceflight on 30 June 1971 during the vehicle's return to Earth after completing the flight program of the first manned orbital station, Salyut. The lunar crater Patsaev is also named after him. The precedingly numbered minor planets 1789 Dobrovolsky and 1790 Volkov were named in honour of his dead crew members.[2]

    The names of all three cosmonauts are also engraved on the plaque next to the sculpture of the Fallen Astronaut on the Moon, which was placed there during the Apollo 15 mission, containing the names of eight American astronauts and six Soviet cosmonauts, who had all died in service. The official naming citation was published by the Minor Planet Center on 1 July 1972 (M.P.C. 3296).[9]

    References
    1. "JPL Small-Body Database Browser: 1791 Patsayev (1967 RE)" (2016-07-29 last obs.). Jet Propulsion Laboratory. Retrieved 8 June 2017.
    2. Schmadel, Lutz D. (2007). "(1791) Patsayev". Dictionary of Minor Planet Names – (1791) Patsayev. Springer Berlin Heidelberg. p. 143. doi:10.1007/978-3-540-29925-7_1792. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (1791) Patsayev". Asteroid Lightcurve Database (LCDB). Retrieved 19 December 2016.
    4. 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. 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 19 December 2016.
    6. Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 19 December 2016.
    7. Black, Sydney; Linville, Dylan; Michalik, Danielle; Wolf, Matthew; Ditteon, Richard (October 2016). "Lightcurve Analysis of Asteroids Observed at the Oakley Southern Sky Observatory: 2015 December - 2016 April". The Minor Planet Bulletin. 43 (4): 287–289. Bibcode:2016MPBu...43..287B. ISSN 1052-8091. Retrieved 19 December 2016.
    8. "1791 Patsayev (1967 RE)". Minor Planet Center. Retrieved 19 December 2016.
    9. Schmadel, Lutz D. (2009). "Appendix – Publication Dates of the MPCs". Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008). Springer Berlin Heidelberg. p. 221. doi:10.1007/978-3-642-01965-4. ISBN 978-3-642-01964-7.

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