1648 Shajna

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1648 Shajna
001648-asteroid shape model (1648) Shajna.png
Shape model of Shajna from its lightcurve
Discovery [1]
Discovered by P. Shajn
Discovery site Simeiz Obs.
Discovery date5 September 1935
Designations
(1648) Shajna
Named after
Couple of astronomers
(Pelageya and Grigory) [2]
1935 RF ·1934 CK1
1938 MC ·1941 FD
1948 LC ·1951 EX2
1952 SX ·1952 UW
1955 QT ·1955 RP
A921 GB ·A924 EQ
main-belt  ·(inner) [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 95.99 yr (35,061 days)
Aphelion 2.6971 AU
Perihelion 1.7737 AU
2.2354 AU
Eccentricity 0.2065
3.34 yr (1,221 days)
250.93°
0° 17m 41.64s / day
Inclination 4.5723°
130.42°
134.71°
Physical characteristics
Dimensions8.26±1.47 km [4]
8.30±0.30 km [5]
9.23 km (calculated) [3]
9.450±0.141 km [6] [7]
6.41368±0.00001 h [8]
6.41369±0.00005 h [9]
6.4140±0.0002 h [10]
6.4140±0.0164 h (R) [11]
6.4248±0.0164 h (S) [11]
0.191±0.016 [6] [7]
0.20 (assumed) [3]
0.247±0.049 [5]
0.35±0.13 [4]
Tholen = S [1]  · S [3]
B–V = 0.792 [1]
U–B = 0.497 [1]
11.838±0.003(R) [11]  ·12.21 [4]  ·12.54 [1] [3] [5] [6]

    1648 Shajna, provisional designation 1935 RF, is a stony asteroid from the inner regions of the asteroid belt, approximately 9 kilometers in diameter. It was discovered on 5 September 1935, by Russian astronomer Pelageya Shajn at Simeiz Observatory on the Crimean peninsula. [12] Two weeks later, it was independently discovered by Cyril Jackson at Johannesburg Observatory, South Africa. It was later named after the discoverer and her husband, Russian astronomers Grigory Shajn. [2]

    Contents

    Orbit and classification

    Shajna orbits the Sun in the inner main-belt at a distance of 1.8–2.7  AU once every 3 years and 4 months (1,221 days). Its well-determined orbit has an eccentricity of 0.21 and an inclination of 5° with respect to the ecliptic. [1] In 1921, Shajna was first identified as 1921 GB at Heidelberg Observatory. Its first used observation was taken at Uccle in 1934, when it was identified as 1934 CK1, extending the body's observation arc by one year prior to its official discovery observation. [12]

    Rotation period

    In July 2005, a rotational lightcurve of was obtained by French amateur astronomer Laurent Bernasconi. It gave a well-defined rotation period of 6.4140 hours with a brightness variation of 0.65 magnitude ( U=3 ). [10] Two modeled lightcurves from various surveys including the Lowell photometric database gave similar periods of 6.41368 and 6.41369 hours ( U=n.a. ). [8] [9] Photometric observations at the Palomar Transient Factory in September 2012, gave nearly identical periods of 6.4140 and 6.4248 hours in the R- and S-band, respectively ( U=2/2 ). [11]

    Diameter and albedo

    According to the surveys carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Shajna measures between 8.26 and 9.45 kilometers in diameter, and its surface has an albedo between 0.191 and 0.35. [4] [5] [6] [7] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 9.23 kilometers with an absolute magnitude of 12.54. [3]

    Naming

    This minor planet was named in honor of the late couple of Russian astronomers Grigory Shajn (1892–1956) and the discoverer herself, Pelageya Shajn (1894–1956), first woman ever to discover a minor planet. The asteroid 1190 Pelagia is also named after her, while her husband is honored by the lunar crater Shayn . [2] The official naming citation was published by the Minor Planet Center on 20 February 1962 ( M.P.C. 2117). [13]

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    References

    1. 1 2 3 4 5 6 7 "JPL Small-Body Database Browser: 1648 Shajna (1935 RF)" (2017-03-29 last obs.). Jet Propulsion Laboratory . Retrieved 30 June 2017.
    2. 1 2 3 Schmadel, Lutz D. (2007). "(1648) Shajna". Dictionary of Minor Planet Names – (1648) Shajna. Springer Berlin Heidelberg. p. 131. doi:10.1007/978-3-540-29925-7_1649. ISBN   978-3-540-00238-3.
    3. 1 2 3 4 5 6 "LCDB Data for (1648) Shajna". Asteroid Lightcurve Database (LCDB). Retrieved 26 December 2016.
    4. 1 2 3 4 Nugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T.; et al. (September 2016). "NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos". The Astronomical Journal. 152 (3): 12. arXiv: 1606.08923 . Bibcode:2016AJ....152...63N. doi: 10.3847/0004-6256/152/3/63 .
    5. 1 2 3 4 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. S2CID   46350317 . Retrieved 26 December 2016.
    6. 1 2 3 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. S2CID   35447010.
    7. 1 2 3 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. S2CID   118745497 . Retrieved 26 December 2016.
    8. 1 2 Durech, J.; Hanus, J.; Oszkiewicz, D.; Vanco, R. (March 2016). "Asteroid models from the Lowell photometric database". Astronomy and Astrophysics. 587: 6. arXiv: 1601.02909 . Bibcode:2016A&A...587A..48D. doi:10.1051/0004-6361/201527573. S2CID   118427201 . Retrieved 26 December 2016.
    9. 1 2 Hanus, J.; Durech, J.; Oszkiewicz, D. A.; Behrend, R.; Carry, B.; Delbo, M.; et al. (February 2016). "New and updated convex shape models of asteroids based on optical data from a large collaboration network". Astronomy and Astrophysics. 586: 24. arXiv: 1510.07422 . Bibcode:2016A&A...586A.108H. doi:10.1051/0004-6361/201527441. S2CID   119112278.
    10. 1 2 Behrend, Raoul. "Asteroids and comets rotation curves – (1648) Shajna". Geneva Observatory . Retrieved 26 December 2016.
    11. 1 2 3 4 Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David; et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal. 150 (3): 35. arXiv: 1504.04041 . Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. S2CID   8342929 . Retrieved 26 December 2016.
    12. 1 2 "1648 Shajna (1935 RF)". Minor Planet Center. Retrieved 26 December 2016.
    13. ↑ 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. Bibcode:2009dmpn.book.....S. doi:10.1007/978-3-642-01965-4. ISBN   978-3-642-01964-7.
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