1635 Bohrmann

1635 Bohrmann, provisional designation 1924 QW, is a stony Koronian asteroid from the outer region of the asteroid belt, approximately 17 kilometers in diameter. It was discovered on 7 March 1924, by German astronomer Karl Reinmuth at Heidelberg Observatory in southern Germany, and named for astronomer Alfred Bohrmann.[2][13]

1635 Bohrmann
A lightcurve-based 3D-model of Bohrmann
Discovery[1]
Discovered byK. Reinmuth
Discovery siteHeidelberg Obs.
Discovery date7 March 1924
Designations
(1635) Bohrmann
Named after
Alfred Bohrmann
(astronomer[2]
1924 QW · 1931 VH1
1936 UJ · 1938 CH
1939 HL · 1943 EG1
1948 EA1 · 1953 FH
main-belt · Koronis[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc93.24 yr (34,057 days)
Aphelion3.0174 AU
Perihelion2.6894 AU
2.8534 AU
Eccentricity0.0575
4.82 yr (1,761 days)
357.19°
0° 12m 16.2s / day
Inclination1.8222°
184.35°
136.06°
Physical characteristics
Dimensions16.60±0.82 km[4]
17.12 km (calculated)[3]
17.127±0.171[5]
17.533±0.244 km[6]
19.12±0.70 km[7]
5.864±0.001 h[8]
5.86427±0.00005 h[9]
11.730±0.005 h[10]
11.73±0.01 h[11]
0.187±0.015[7]
0.2104±0.0154[6]
0.219±0.049[5]
0.24 (assumed)[3]
0.255±0.052[4]
SMASS = S[1] · S[3]
10.95±0.01[8] · 11.0[1][3][4] · 11.05±0.24[12] · 11.1[6][7]

    Orbit and classification

    The stony S-type asteroid belongs to the Koronis family, a group consisting of few hundred known bodies with nearly ecliptical orbits. It orbits the Sun in the outer main-belt at a distance of 2.7–3.0 AU once every 4 years and 10 months (1,761 days). Its orbit has an eccentricity of 0.06 and an inclination of 2° with respect to the ecliptic.[1]

    As no precoveries were taken, Bohrmann's observation arc begins with the first used observation taken on the night following its discovery.[13]

    Diameter and albedo

    According to the surveys carried out by the Japanese Akari satellite and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Bohrmann measures between 16.6 and 19.1 kilometers in diameter, and its surface has an albedo between 0.187 and 0.255.[4][5][6][7] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for members of the Koronian family of 0.24, and calculates a diameter of 17.1 kilometers with an absolute magnitude of 11.0.[3]

    Lightcurves

    In September and October 2003, four rotational lightcurves were obtained for this asteroid from photometric observations at several observatories around the world, including the Whitin Observatory in Wellesley, Massachusetts, as well as by U.S. astronomers Robert Stephens and Brian Warner. The lightcurves gave two different solutions for the Bohrmann's rotation period. One solution gave 5.864±0.001[8] and 5.86427±0.00005[9] hours, while the alternative solution gave 11.73±0.01[11] and 11.730±0.005[10] hours. The lightcurves had a concurring brightness variation of 0.25 in magnitude (U=2/2/3/n.a.).[3]

    Naming

    This minor planet was named after German astronomer Alfred Bohrmann (1904–2000), a long-time observer of minor planets at the discovering Heidelberg Observatory and a discoverer of minor planets himself. During his career he had published several hundreds of precise observations of asteroids.[2] The official naming citation was published by the Minor Planet Center on 20 February 1976 (M.P.C. 3931).[14]

    References
    1. "JPL Small-Body Database Browser: 1635 Bohrmann (1924 QW)" (2017-06-05 last obs.). Jet Propulsion Laboratory. Retrieved 30 June 2017.
    2. Schmadel, Lutz D. (2007). "(1635) Bohrmann". Dictionary of Minor Planet Names – (1635) Bohrmann. Springer Berlin Heidelberg. p. 130. doi:10.1007/978-3-540-29925-7_1636. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (1635) Bohrmann". Asteroid Lightcurve Database (LCDB). Retrieved 6 August 2016.
    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. Retrieved 6 August 2016.
    5. Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 8 December 2016.
    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:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90.
    7. 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)
    8. Slivan, Stephen M.; Binzel, Richard P.; Boroumand, Shaida C.; Pan, Margaret W.; Simpson, Christine M.; Tanabe, James T.; et al. (May 2008). "Rotation rates in the Koronis family, complete to H≈11.2". Icarus. 195 (1): 226–276. Bibcode:2008Icar..195..226S. doi:10.1016/j.icarus.2007.11.019. Retrieved 6 August 2016.
    9. Hanus, J.; Durech, J.; Broz, M.; Warner, B. D.; Pilcher, F.; Stephens, R.; et al. (June 2011). "A study of asteroid pole-latitude distribution based on an extended set of shape models derived by the lightcurve inversion method". Astronomy and Astrophysics. 530: 16. arXiv:1104.4114. Bibcode:2011A&A...530A.134H. doi:10.1051/0004-6361/201116738. Retrieved 6 August 2016.
    10. Stephens, Robert D.; Warner, Brian D. (March 2004). "Lightcurve analysis of Koronis family asteroid 1635 Bohrmann". The Minor Planet Bulletin. 31 (1): 3–4. Bibcode:2004MPBu...31....3S. ISSN 1052-8091. Retrieved 6 August 2016.
    11. Simpson, Christine M. (March 2004). "Rotation period and lightcurve of asteroid 1635 Bohrmann". The Minor Planet Bulletin. 31 (1): 2. Bibcode:2004MPBu...31....2S. ISSN 1052-8091. Retrieved 6 August 2016.
    12. 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 6 August 2016.
    13. "1635 Bohrmann (1924 QW)". Minor Planet Center. Retrieved 6 August 2016.
    14. 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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