1693 Hertzsprung

1693 Hertzsprung
Discovery [1]
Discovered by H. van Gent
Discovery site Johannesburg Obs.
(Leiden Southern Station)
Discovery date 5 May 1935
Designations
MPC designation 1693 Hertzsprung
Named after
 Ejnar Hertzsprung
(chemist, astronomer) [2]
1935 LA · 1930 HG
1944 HA · 1950 VM
main-belt · (outer) [3]
Orbital characteristics [1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 80.69 yr (29,472 days)     
Aphelion 3.5608 AU
Perihelion 2.0319 AU
2.7963 AU
Eccentricity 0.2734
4.68 yr (1,708 days)
79.7745°
0° 12m 38.88s / day
Inclination 11.9401°
69.9869°
234.991°
Earth MOID 1.04173 AU (155.841 Gm)
Jupiter MOID 1.7797 AU (266.24 Gm)
Jupiter Tisserand parameter 3.240
Physical characteristics
Dimensions 38.67±1.5 km (IRAS:5)[4]
35.27±0.47 km[5]
40.396±0.972 km[6]
39±4 km[7]
8.825 h[8]
0.0484±0.004 (IRAS:5)[4]
0.059±0.002[5]
0.0330±0.0034[6]
0.05±0.01[7]
B–V = 0.762[1]
U–B = 0.358[1]
Tholen = CBU [1]
P [6] · C [3]
10.97[1][3][4][5][6][7]
11.39±0.82[9]

    1693 Hertzsprung, provisional designation 1935 LA, is a carbonaceous asteroid from the outer region of the asteroid belt, approximately 39 kilometers in diameter. It was discovered by Dutch astronomer Hendrik van Gent at the Leiden Southern Station, annex to the Johannesburg Observatory in South Africa on 5 May 1935.[10]

    The asteroid orbits the Sun at a distance of 2.0–3.6 AU once every 4 years and 8 months (1,708 days). Its orbit has an eccentricity of 0.27 and an inclination of 12° with respect to the plane of the ecliptic.[1] The asteroid was already observed prior to its discovery at Crimea-Simeis in 1930. However, these precoveries were not used to extend its observation arc.[10]

    A rotational light-curve was obtained from photometric observations made with the ESO 1-metre telescope at La Silla in August 1987. The light-curve gave it a well-defined rotation period of 8.825 hours with a brightness amplitude of 0.45 in magnitude (U=3).[8]

    According to the space-based surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid measures between 35.3 and 40.4 kilometers in diameter and its surface has an albedo in the range of 0.033 to 0.059.[4][5][6][7] The Collaborative Asteroid Lightcurve Link (CALL) gives preference to the results obtained by IRAS with an albedo of 0.048 and a diameter of 38.7 kilometers.[3] While the dark C-type asteroid is classified as a rare CBU-subtype on the Tholen taxonomic scheme, the NEOWISE mission groups the body to the rare and reddish P-type asteroids.[6]

    The minor planet was named in memory of Danish chemist and astronomer Ejnar Hertzsprung (1873–1967), best known for the famous Hertzsprung–Russell diagram, a spectral classification system for stars he developed jointly with Russel, after whom the asteroid 1762 Russell was named. From 1934 to 1945, Hertzsprung was the head of the Leiden Observatory in the Netherlands. As a prominent expert in photometry, he initiated a survey of variable stars in the Southern Milky Way at the Leiden Southern Station. A number of asteroids and comets were also discovered during the course of this survey. The asteroid's name was suggested by the staff at Leiden Observatory.[2] Naming citation was published before November 1977 (M.P.C. 2822).[11]

    References

    1. 1 2 3 4 5 6 7 "JPL Small-Body Database Browser: 1693 Hertzsprung (1935 LA)" (2016-01-12 last obs.). Jet Propulsion Laboratory. Retrieved 16 May 2016.
    2. 1 2 Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1693) Hertzsprung. Springer Berlin Heidelberg. p. 135. ISBN 978-3-540-00238-3. Retrieved 16 May 2016.
    3. 1 2 3 4 "LCDB Data for (1693) Hertzsprung". Asteroid Lightcurve Database (LCDB). Retrieved 16 May 2016.
    4. 1 2 3 4 Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. Bibcode:2004PDSS...12.....T. Retrieved 16 May 2016.
    5. 1 2 3 4 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. Retrieved 16 May 2016.
    6. 1 2 3 4 5 6 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:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 16 May 2016.
    7. 1 2 3 4 Alí-Lagoa, V.; de León, J.; Licandro, J.; Delbó, M.; Campins, H.; Pinilla-Alonso, N.; Kelley, M. S. (June 2013). "Physical properties of B-type asteroids from WISE data". Astronomy & Astrophysics. 554: 16. arXiv:1303.5487Freely accessible. Bibcode:2013A&A...554A..71A. doi:10.1051/0004-6361/201220680. Retrieved 10 November 2015.
    8. 1 2 Barucci, M. A.; di Martino, M.; Fulchignoni, M. (May 1992). "Rotational properties of small asteroids - Photoelectric observations". Astronomical Journal: 1679–1686. Bibcode:1992AJ....103.1679B. doi:10.1086/116185. ISSN 0004-6256. Retrieved 10 November 2015.
    9. ↑ 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:1506.00762Freely accessible. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 16 May 2016.
    10. 1 2 "1693 Hertzsprung (1935 LA)". Minor Planet Center. Retrieved 16 May 2016.
    11. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 16 May 2016.

    External links

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