910 Anneliese

910 Anneliese (prov. designation: A919 EC or 1919 FB) is a dark background asteroid, approximately 48 kilometers (30 miles) in diameter, located in the outer regions of the asteroid belt. It was discovered on 1 March 1919, by astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in southwest Germany.[1] The carbonaceous C-type asteroid (Ch) has a rotation period of 11.3 hours and is likely spherical in shape. It was named by German astronomer Julius Dick after his friend "Anneliese".[3]

910 Anneliese
Discovery [1]
Discovered byK. Reinmuth
Discovery siteHeidelberg Obs.
Discovery date1 March 1919
Designations
(910) Anneliese
PronunciationGerman: [ˈanəliːzə][2]
Named after
Anneliese, friend of astronomer Julius Dick [3]
A919 EC · 1946 SJ
1975 AH · A924 BD
1919 FB · 1924 BD
main-belt [1][4] · (outer)
background [5][6]
Orbital characteristics [4]
Epoch 31 May 2020 (JD 2459000.5)
Uncertainty parameter 0
Observation arc100.93 yr (36,864 d)
Aphelion3.3765 AU
Perihelion2.4747 AU
2.9256 AU
Eccentricity0.1541
5.00 yr (1,828 d)
340.99°
0° 11m 49.2s / day
Inclination9.2090°
49.936°
208.47°
Physical characteristics
Mean diameter
  • 47.07±4.5 km[7]
  • 48.590±0.216 km[8]
  • 48.85±0.57 km[9]
11.2863±0.0002 h[10]
  • 0.057±0.013[8]
  • 0.057±0.002[9]
  • 0.0605±0.013[7]
10.5[1][4]

    Orbit and classification

    Anneliese 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 outer asteroid belt at a distance of 2.5–3.4 AU once every 5.00 years (1,828 days; semi-major axis of 2.93 AU). Its orbit has an eccentricity of 0.15 and an inclination of 9° with respect to the ecliptic.[4] The body's observation arc begins at Heidelberg Observatory on 19 March 1919, or 18 days after its official discovery observation.[1]

    Naming

    This minor planet was named after "Anneliese", an acquaintance of the German astronomer Julius Dick from the Babelsberg Observatory, who suggested the asteroid's name. The naming was also mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 88).[3]

    Physical characteristics

    In the Bus–Binzel SMASS classification, Anneliese is a hydrated carbonaceous C-type asteroid (Ch).[4][6]

    Rotation period

    In June 2015, a rotational lightcurve of Anneliese was obtained from photometric observations by Uruguayan astronomer Eduardo Álvarez at the Los Algarrobos Observatory (I38). Lightcurve analysis gave a well-defined rotation period of 11.2863±0.0002 hours with a brightness variation of 0.16±0.02 magnitude, indicative of a spherical, non-elongated shape (U=3). At the time Anneliese was one of only 17 three-digit numbered asteroids for which no period was published.[10] In May 2015, Julian Oey at the Blue Mountains Observatory (Q68), Australia, determined a concurring period of 11.294±0.002 hours with an amplitude of 0.55±0.03 magnitude (U=2+).[11] In May 2015 a collaboration of Spanish amateur astronomers including Alfonso Garceràn (J08), Amadeo Macias (Z95), Enrique Mansego (J67), Pedro Rodriguez (Z98) and Juan de Haro (I57) measured a period of 5.63±0.01 hours—or half the period solution of the other observations, with an amplitude of 0.13±0.01 magnitude (U=2+).[12]

    Diameter and albedo

    According to the survey carried out by the Infrared Astronomical Satellite IRAS, the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), and the Japanese Akari satellite, Anneliese measures (47.07±4.5), (48.590±0.216) and (48.85±0.57) kilometers in diameter and its surface has an albedo of (0.0605±0.013), (0.057±0.013) and (0.057±0.002), respectively.[7][8][9] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0505 and a diameter of 46.98 kilometers based on an absolute magnitude of 10.5,[13] while Alvares gives a diameter of (46.3±3.5 km) and an albedo of (0.06±0.02).[10] An asteroid occultation, observed on 14 September 2012, gave a best-fit ellipse dimension of 48.0 × 48.0 kilometers.[6] These timed observations are taken when the asteroid passes in front of a distant star. However the quality of the measurement is rated poorly.[6]

    Further published mean-diameters by the WISE team include (43.35±0.30 km), (45.974±14.40 km) and (50.756±0.905 km) with corresponding albedos of (0.04±0.01), (0.0586±0.0483) and (0.0308±0.0014).[6][13]

    References
    1. "910 Anneliese (A919 EC)". Minor Planet Center. Retrieved 23 February 2020.
    2. (German Names)
    3. Schmadel, Lutz D. (2007). "(910) Anneliese". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 81. doi:10.1007/978-3-540-29925-7_911. ISBN 978-3-540-00238-3.
    4. "JPL Small-Body Database Browser: 910 Anneliese (A919 EC)" (2020-02-03 last obs.). Jet Propulsion Laboratory. Retrieved 23 February 2020.
    5. "Asteroid 910 Anneliese – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 23 February 2020.
    6. "Asteroid 910 Anneliese". Small Bodies Data Ferret. Retrieved 23 February 2020.
    7. 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 23 February 2020.
    8. 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.
    9. 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 23 February 2020. (online, AcuA catalog p. 153)
    10. Alvarez, Eduardo Manuel (October 2015). "Rotation Period and H-G Parameters Determination for 910 Anneliese" (PDF). Minor Planet Bulletin. 42 (4): 252–253. Bibcode:2015MPBu...42..252A. ISSN 1052-8091.
    11. Oey, Julian; Groom, Roger (October 2018). "Lightcurve Analysis of Main-belt Asteroids from BMO and DRO in 2016: I" (PDF). Minor Planet Bulletin. 45 (4): 363–366. Bibcode:2018MPBu...45..363O. ISSN 1052-8091.
    12. Garceràn, Alfonso Carreño; Macias, Amadeo Aznar; Mansego, Enrique Arce; Rodriguez, Pedro Brines; de Haro, Juan Lozano (October 2015). "Lightcurve Analysis of Six Asteroids" (PDF). Minor Planet Bulletin. 42 (4): 235–237. Bibcode:2015MPBu...42..235G. ISSN 1052-8091.
    13. "LCDB Data for (910) Anneliese". Asteroid Lightcurve Database (LCDB). Retrieved 23 February 2020.
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