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 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc 80.69 yr (29472 days)
Aphelion 3.5610 AU (532.72 Gm)
Perihelion 2.0322 AU (304.01 Gm)
2.7966 AU (418.37 Gm)
Eccentricity 0.27333
4.68 yr (1708.2 d)
37.602°
0° 12m 38.664s / day
Inclination 11.939°
69.990°
235.02°
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 km[4]
35.27±0.47 km[5]
40.396±0.972 km[6]
39±4 km[7]
Mean radius
 19.335 ± 0.75 km
8.825 h (0.3677 d)[1][8]
0.0484[4]
0.059±0.002[5]
0.0330±0.0034[6]
0.05±0.01[7]
0.0484 ± 0.004[1]
B–V = 0.762
U–B = 0.358
Tholen = CBU[1]
C [3]
10.97

    1693 Hertzsprung, provisional designation 1935 LA, is a dark and eccentric asteroid from the outer region of the asteroid belt, about 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.[9]

    The carbonaceous C-type asteroid is classified as a rare CBU-type subtype on the Tholen classification scheme. It orbits the Sun at a distance of 2.0–3.6 AU once every 4 years and 8 months (1,708 days). Its orbit shows an eccentricity of 0.27 and is tilted by 12 degrees to the plane of the ecliptic.[1] It has a rotation period of 8.8 hours[8] and an albedo of 0.03–0.06, according to observations made by the IRAS, Akari, WISE and NEOWISE missions.[4][5][6][7]

    The asteroid is named in honor of Danish chemist and astronomer Ejnar Hertzsprung (1873–1967), who was the director of the Leiden Observatory from 1934 to 1945. A well-known authority in the field of astronomical photometry, he initiated the Leiden Variable Star Survey of the southern Milky Way, during which survey many asteroids and some comets were found.[2] Hertzsprung is best known for the spectral classification system for stars he developed jointly with Russel, the famous Hertzsprung–Russell diagram.

    References

    1. 1 2 3 4 5 6 "JPL Small-Body Database Browser: 1693 Hertzsprung (1935 LA)" (2015-09-19 last obs.). Jet Propulsion Laboratory. Retrieved 22 April 2016.
    2. 1 2 Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1693) Hertzsprung. Springer Berlin Heidelberg. p. 135. ISBN 978-3-540-29925-7. Retrieved November 2015.
    3. 1 2 "LCDB Data for (1693) Hertzsprung". Asteroid Lightcurve Database (LCDB). Retrieved November 2015.
    4. 1 2 3 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 November 2015.
    5. 1 2 3 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 November 2015.
    6. 1 2 3 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. Retrieved November 2015.
    7. 1 2 3 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:1303.5487. Bibcode:2013A&A...554A..71A. doi:10.1051/0004-6361/201220680. Retrieved 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 November 2015.
    9. ↑ "1693 Hertzsprung (1935 LA)". Minor Planet Center. Retrieved November 2015.

    External links


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