922 Schlutia
Discovery [1]
Discovered byK. Reinmuth
Discovery siteHeidelberg Obs.
Discovery date18 September 1919
Designations
(922) Schlutia
Named after
Edgar Schlubach
Henry Frederic Tiarks
(expedition sponsors)[2]
A919 SJ · A906 UC
1919 FW · 1906 UC
main-belt [1][3] · (middle)
background [4][5]
Orbital characteristics [3]
Epoch 31 May 2020 (JD 2459000.5)
Uncertainty parameter 0
Observation arc112.56 yr (41,114 d)
Aphelion3.2117 AU
Perihelion2.1667 AU
2.6892 AU
Eccentricity0.1943
4.41 yr (1,611 d)
314.34°
0° 13m 24.6s / day
Inclination7.2999°
205.17°
126.54°
Physical characteristics
Mean diameter
7.85683±0.00019 h[8]
  • 0.105±0.010[7]
  • 0.107±0.015[6]
n.a.
12.1[1][3]

    922 Schlutia (prov. designation: A919 SJ or 1919 FW) is a background asteroid from the central regions of the asteroid belt. It was discovered by German astronomer Karl Reinmuth at the Heidelberg Observatory on 18 September 1919.[1] The asteroid with an unknown spectral type has a rotation period of 7.9 hours and measures approximately 18 kilometers (11 miles) in diameter. It was named after Edgar Schlubach and Henry Frederic Tiarks, who sponsored an expedition to observe the solar eclipse of 21 September 1922.[2]

    Orbit and classification

    Schlutia is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements.[4][5] It orbits the Sun in the central main-belt at a distance of 2.2–3.2 AU once every 4 years and 5 months (1,611 days; semi-major axis of 2.69 AU). Its orbit has an eccentricity of 0.19 and an inclination of 7° with respect to the ecliptic.[3] The body's observation arc begins with its first observation as A906 UC (1906 UC) at Heidelberg Observatory on 17 October 1906, almost 13 years prior to its official discovery observation.[1]

    Naming

    This minor planet was named after Edgar Schlubach, a German businessman from Hamburg, as well as Henry Frederic Tiarks, FRAS, British banker and amateur astronomer from London, who together financed the Dutch-German expedition to the Christmas Island to observe the solar eclipse of 21 September 1922. The asteroid was named by Schlubach and Tiarks and published in the journal Astronomische Nachrichten in 1923 (AN 218, 253). The naming was also mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 89).[2]

    Physical characteristics

    Schlutia's spectral type has not been determined.[5][9]

    Rotation period

    In August 2007, a rotational lightcurve of Schlutia was obtained from photometric observations by amateur astronomers Pierre Antonini and Silvano Casulli. Lightcurve analysis gave a well-defined rotation period of 7.85683±0.00019 hours with a low brightness amplitude of 0.18±0.02 magnitude, indicative of a regular, spherical shape (U=3).[8][9]

    Diameter and albedo

    According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE) and the Japanese Akari satellite Schlutia measures (18.579±0.223) and (18.71±0.76) kilometers in diameter and its surface has an albedo of (0.107±0.015) and (0.105±0.010), respectively.[6][7] The Collaborative Asteroid Lightcurve Link assumes an intermediate albedo of 0.1 and calculates a diameter of 16.73 kilometers based on an absolute magnitude of 12.0.[9] Further published mean-diameters by the WISE team include (13.75±3.14 km), (14.709±4.008 km), (15.081±4.465 km) and (19.228±0.221 km) with corresponding albedos of (0.12±0.06), (0.0832±0.0514), (0.0760±0.0516) and (0.1000±0.0217).[5][9]

    References

    1. 1 2 3 4 5 "922 Schlutia (A919 SJ)". Minor Planet Center. Retrieved 21 February 2020.
    2. 1 2 3 Schmadel, Lutz D. (2007). "(922) Schlutia". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 82. doi:10.1007/978-3-540-29925-7_923. ISBN 978-3-540-00238-3.
    3. 1 2 3 4 "JPL Small-Body Database Browser: 922 Schlutia (A919 SJ)" (2019-05-11 last obs.). Jet Propulsion Laboratory. Retrieved 21 February 2020.
    4. 1 2 "Asteroid 922 Schlutia – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 21 February 2020.
    5. 1 2 3 4 "Asteroid 922 Schlutia". Small Bodies Data Ferret. Retrieved 21 February 2020.
    6. 1 2 3 Mainzer, A. K.; Bauer, J. M.; Cutri, R. M.; Grav, T.; Kramer, E. A.; Masiero, J. R.; et al. (June 2016). "NEOWISE Diameters and Albedos V1.0". NASA Planetary Data System: EAR-A-COMPIL-5-NEOWISEDIAM-V1.0. Bibcode:2016PDSS..247.....M.
    7. 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)
    8. 1 2 Behrend, Raoul. "Asteroids and comets rotation curves – (922) Schlutia". Geneva Observatory. Retrieved 21 February 2020.
    9. 1 2 3 4 "LCDB Data for (922) Schlutia". Asteroid Lightcurve Database (LCDB). Retrieved 21 February 2020.
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