1628 Strobel

1628 Strobel, provisional designation 1923 OG, is a carbonaceous asteroid from the outer region of the asteroid belt, approximately 55 kilometers in diameter.

1628 Strobel
Discovery [1]
Discovered byK. Reinmuth
Discovery siteHeidelberg Obs.
Discovery date11 September 1923
Designations
(1628) Strobel
Named after
Willi Strobel (astronomer)[2]
1923 OG · 1926 GY
1947 GC · 1949 QA2
1952 DV2 · 1957 CA
1960 WH
main-belt · (outer) [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc93.11 yr (34,007 days)
Aphelion3.2152 AU
Perihelion2.8088 AU
3.0120 AU
Eccentricity0.0675
5.23 yr (1,909 days)
244.38°
0° 11m 18.6s / day
Inclination19.387°
181.19°
289.14°
Physical characteristics
Dimensions51.15±14.91 km[4]
53.147±0.793 km[5]
54.26±16.39 km[6]
56.58±0.68 km[7]
57.06 km (derived)[3]
57.12±1.7 km (IRAS:12)[8]
59.345±0.484 km[9]
9.52±0.01 h[10]
11.80 h[11]
0.047±0.010[9]
0.05±0.03[6]
0.0504 (derived)[3]
0.0532±0.003 (IRAS:12)[8]
0.055±0.002[7]
0.0581±0.0113[5]
0.06±0.04[4]
P [5] · X [12] · C [3]
B–V = 0.840[1]
U–B = 0.320[1]
10.02[1][6][7][8] · 10.08[3][5][11] · 10.31±0.20[12] · 10.32[4]

    It was discovered on 11 September 1923, by German astronomer Karl Reinmuth at Heidelberg Observatory in southern Germany, and named after ARI-astronomer Willi Strobel.[2][13]

    Classification and orbit

    Strobel orbits the Sun in the outer main-belt at a distance of 2.8–3.2 AU once every 5 years and 3 months (1,909 days). Its orbit has an eccentricity of 0.07 and an inclination of 19° with respect to the ecliptic.[1] Strobel's observation arc begins two nights after its official discovery observation at Heidelberg in 1923.[13]

    Physical characteristics

    Strobel is a carbonaceous C-type asteroid. It is also classified as a P-type by WISE and as an X-type asteroid by Pan-STARRS.[5][12]

    Rotation period

    American astronomer Richard Binzel obtained the first rotational lightcurve of Strobel in May 1984. It gave a rotation period of 11.80 hours with a brightness amplitude of 0.22 magnitude (U=2).[11] In May 2005, photometric observations by French amateur astronomer Laurent Bernasconi gave a shorter period of 9.52 hours and a brightness change of 0.20 magnitude (U=2).[10]

    Diameter and albedo

    According to the 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, Strobel measures between 51.15 and 59.35 kilometers in diameter, and its surface has an albedo between 0.047 and 0.06.[4][5][6][7][8][9] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0504 and a diameter of 57.06 kilometers with an absolute magnitude of 10.08.[3]

    Naming

    This minor planet was named in honor of Willi Strobel (1909–1988), staff member at Astronomisches Rechen-Institut (ARI) since 1938, and author of the 1963-edition of Identifizierungsnachweis der Kleinen Planeten (Minor planet identifications, published by ARI).[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: 1628 Strobel (1923 OG)" (2016-10-19 last obs.). Jet Propulsion Laboratory. Retrieved 30 June 2017.
    2. Schmadel, Lutz D. (2007). "(1628) Strobel". Dictionary of Minor Planet Names – (1628) Strobel. Springer Berlin Heidelberg. p. 129. doi:10.1007/978-3-540-29925-7_1629. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (1628) Strobel". Asteroid Lightcurve Database (LCDB). Retrieved 27 December 2016.
    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. Retrieved 27 December 2016.
    5. 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.
    6. Nugent, C. R.; Mainzer, A.; Masiero, J.; Bauer, J.; Cutri, R. M.; Grav, T.; et al. (December 2015). "NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos". The Astrophysical Journal. 814 (2): 13. arXiv:1509.02522. Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117. Retrieved 27 December 2016.
    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. Retrieved 17 October 2019. (online, AcuA catalog p. 153)
    8. Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System – IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 17 October 2019.
    9. 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 27 December 2016.
    10. Behrend, Raoul. "Asteroids and comets rotation curves – (1628) Strobel". Geneva Observatory. Retrieved 27 December 2016.
    11. Binzel, R. P. (October 1987). "A photoelectric survey of 130 asteroids". Icarus. 72 (1): 135–208. Bibcode:1987Icar...72..135B. doi:10.1016/0019-1035(87)90125-4. ISSN 0019-1035. Retrieved 27 December 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 27 December 2016.
    13. "1628 Strobel (1923 OG)". Minor Planet Center. Retrieved 27 December 2016.
    14. Schmadel, Lutz D. "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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