920 Rogeria
Modelled shape of Rogeria from its lightcurve
Discovery [1]
Discovered byK. Reinmuth
Discovery siteHeidelberg Obs.
Discovery date1 September 1919
Designations
(920) Rogeria
Named after
Name picked from the almanac
Lahrer Hinkender Bote [2][3]
A919 RC · 1919 FT
1973 QC
main-belt [1][4] · (middle)
background [5][6]
Orbital characteristics [4]
Epoch 31 May 2020 (JD 2459000.5)
Uncertainty parameter 0
Observation arc99.69 yr (36,412 d)
Aphelion2.8993 AU
Perihelion2.3476 AU
2.6234 AU
Eccentricity0.1051
4.25 yr (1,552 d)
162.25°
0° 13m 55.2s / day
Inclination11.577°
192.79°
268.97°
Physical characteristics
Mean diameter
  • 23.89±0.9 km[7]
  • 25.80±0.36 km[8]
  • 26.656±0.168 km[9]
12.244±0.003 h[10]
  • (238.0°, −15.0°) (λ1/β1)[6]
  • (47.0°, −35.0°) (λ2/β2)[6]
  • 0.076±0.012[9]
  • 0.090±0.003[8]
  • 0.1035±0.008[7]
11.3[1][4]

    920 Rogeria (prov. designation: A919 RC or 1919 FT) is a dark background asteroid from the central region of the asteroid belt, discovered by German astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory on 1 September 1919.[1] The D-type asteroid (DT) has a rotation period of 12.2 hours and measures approximately 26 kilometers (16 miles) in diameter. It was named "Rogeria", a name unrelated to the discoverer's contemporaries, that was taken from the almanac Lahrer Hinkender Bote.[2][3]

    Orbit and classification

    Rogeria, located in the orbital region of the Eunomia family,[12] is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements.[5][6] It orbits the Sun in the central asteroid belt at a distance of 2.3–2.9 AU once every 4 years and 3 months (1,552 days; semi-major axis of 2.62 AU). Its orbit has an eccentricity of 0.11 and an inclination of 12° with respect to the ecliptic.[4] The body's observation arc begins at Heidelberg Observatory with its official discovery observation.[1]

    Naming

    This minor planet was named after the feminine form of the name "Roger", picked from the Lahrer Hinkender Bote, which was published in Lahr, southern Germany.[2][3] A Hinkender Bote (lit. "limping messenger") was a very popular almanac, especially in the alemannic-speaking region from the late 17th throughout the early 20th century. The calendar section contains feast days, the dates of important fairs and astronomical ephemerides. For 5 January, the calendar gives "Roger" as the German name day analogue next to Simeon and Telesph., the protestant and catholic entries in the calendar of saints, likely referring to Simeon Stylites and Pope Telesphorus.[13]

    Reinmuth's calendar names

    As with 22 other asteroids – starting with 913 Otila, and ending with 1144 Oda – Reinmuth selected names from this calendar due to his many asteroid discoveries that he had trouble thinking of proper names. These names are not related to the discoverer's contemporaries. Lutz Schmadel, the author of the Dictionary of Minor Planet Names learned about Reinmuth's source of inspiration from private communications with Dutch astronomer Ingrid van Houten-Groeneveld, who worked as a young astronomer at Heidelberg.[2]

    Physical characteristics

    In the Tholen classification, Rogeria is closest to a dark D-type and somewhat similar to an uncommon T-type asteroid, though with an unusual spectrum (DTU).[4] D-type asteroids are more common further out the asteroid belt and among the Jupiter trojan population. In the SDSS-based taxonomy, Rogeria is an X-type asteroid.[6][11]

    Rotation period and poles

    Lightcurve-based 3D-model of Rogeria

    In October 2010, a rotational lightcurve of Rogeria was obtained from photometric observations by Thomas A. Polakis at the Command Module Observatory (V02) in Arizona. Lightcurve analysis gave a rotation period of 12.244±0.003 hours with a brightness variation of 0.31±0.03 magnitude (U=3−).[10] A tentative period determination of 9.05±0.05 hours with an amplitude of 0.21±0.01 magnitude was made by French amateur French astronomer René Roy in July 2012 (U=2−).[14] Another observation by Petr Pravec and Peter Kušnirák at Ondřejov Observatory in June 2007 gave a period of 8.09 hours (U=2−).[lower-alpha 1]

    In 2016, a modeled lightcurve gave a concurring sidereal period of 12.5749±0.0002 hours using data from the Uppsala Asteroid Photometric Catalogue, the Palomar Transient Factory survey, and individual observers (such as above), as well as sparse-in-time photometry from the NOFS, the Catalina Sky Survey, and the La Palma surveys (950). The study also determined two spin axes of (238.0°, −15.0°) and (47.0°, −35.0°) in ecliptic coordinates (λ, β).[15]

    Diameter and albedo

    According to the survey carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), Rogeria measures (23.89±0.9), (25.80±0.36) and (26.656±0.168) kilometers in diameter and its surface has a low albedo of (0.1035±0.008), (0.090±0.003) and (0.076±0.012), respectively.[7][8][9]

    The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0613 and a diameter of 29.71 km based on an absolute magnitude of 11.285.[12] Further published mean-diameters and albedos by the WISE team include (22.03±4.45 km), (23.69±7.40 km) and (29.683±0.260 km) with corresponding albedos of (0.09±0.06), (0.09±0.05) and (0.0670±0.0030).[6][12]

    Notes

    1. ↑ lightcurve plot of (920) Rogeria by Pravec and Kusnirak at Ondřejov Observatory (2012). Rotation period 8.09 hours with a brightness amplitude of 0.16 mag. Quality Code is 2−. Summary figures at the LCDB and Pravec, P.; Wolf, M.; Sarounova, L. (2007) (Ondrejov data).

    References

    1. 1 2 3 4 5 "920 Rogeria (A919 RC)". Minor Planet Center. Retrieved 21 February 2020.
    2. 1 2 3 4 Schmadel, Lutz D. (2007). "(920) Rogeria". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 82. doi:10.1007/978-3-540-29925-7_921. ISBN 978-3-540-00238-3.
    3. 1 2 3 "Lahrer hinkender Bote – Kalender 1925". Badischen Landesbibliothek. 1925. p. 1. Retrieved 21 February 2020. Lahrer Bote archive
    4. 1 2 3 4 5 6 7 8 "JPL Small-Body Database Browser: 920 Rogeria (A919 RC)" (2019-05-11 last obs.). Jet Propulsion Laboratory. Retrieved 21 February 2020.
    5. 1 2 "Asteroid 920 Rogeria – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 21 February 2020.
    6. 1 2 3 4 5 6 "Asteroid 920 Rogeria". Small Bodies Data Ferret. Retrieved 21 February 2020.
    7. 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. 12: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 21 February 2020.
    8. 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. (online, AcuA catalog p. 153)
    9. 1 2 3 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.
    10. 1 2 Polakis, Tom (April 2018). "Lightcurve Analysis for Seven Main-belt Asteroids" (PDF). Minor Planet Bulletin. 45 (2): 112–115. Bibcode:2018MPBu...45..112P. ISSN 1052-8091. Archived from the original (PDF) on 12 February 2020. Retrieved 22 February 2020.
    11. 1 2 Carvano, J. M.; Hasselmann, P. H.; Lazzaro, D.; Mothé-Diniz, T. (February 2010). "SDSS-based taxonomic classification and orbital distribution of main belt asteroids". Astronomy and Astrophysics. 510: 12. Bibcode:2010A&A...510A..43C. doi:10.1051/0004-6361/200913322. Retrieved 21 February 2020. (PDS data set)
    12. 1 2 3 "LCDB Data for (920) Rogeria". Asteroid Lightcurve Database (LCDB). Retrieved 21 February 2020.
    13. ↑ "Lahrer hinkender Bote – Kalender 1925". Badischen Landesbibliothek. 1925. p. 2. Retrieved 20 February 2020.
    14. ↑ Behrend, Raoul. "Asteroids and comets rotation curves – (920) Rogeria". Geneva Observatory. Retrieved 21 February 2020.
    15. ↑ Hanuš, J.; Ďurech, J.; Brož, M.; Marciniak, A.; Warner, B. D.; Pilcher, F.; et al. (March 2013). "Asteroids' physical models from combined dense and sparse photometry and scaling of the YORP effect by the observed obliquity distribution". Astronomy and Astrophysics. 551: A67. arXiv:1301.6943. Bibcode:2013A&A...551A..67H. ISSN 0004-6361.
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