7449 Döllen

7449 Döllen, provisional designation 1949 QL, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 3.5 kilometers (2.2 miles) in diameter. It was discovered on 21 August 1949, by German astronomer Karl Reinmuth at the Heidelberg Observatory in southwest Germany.[1] The likely S-type asteroid has a rotation period of 10 hours.[3] It was named after German astronomer Wilhelm Döllen.[1]

7449 Döllen
Discovery [1]
Discovered byK. Reinmuth
Discovery siteHeidelberg Obs.
Discovery date21 August 1949
Designations
(7449) Döllen
Named after
Wilhelm Döllen [1]
(German astronomer)
1949 QL · 1949 QZ
1969 TV3
main-belt [1][2] · (inner)
Flora [3][4]
Orbital characteristics [2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc68.68 yr (25,085 d)
Aphelion2.6599 AU
Perihelion1.7865 AU
2.2232 AU
Eccentricity0.1964
3.31 yr (1,211 d)
230.21°
0° 17m 50.28s / day
Inclination6.2648°
335.74°
26.045°
Physical characteristics
Mean diameter
3.389±0.151 km[5][6]
3.74 km (calculated)[3]
10±2.0 h[7]
0.24 (assumed)[3]
0.465±0.064[5][6]
S  (Flora family)[3]
13.8[6]
14.3[2][3]

    Orbit and classification

    Döllen is a member of the Flora family (402),[4] a giant asteroid family and the largest family of stony asteroids in the main-belt.[8]

    It orbits the Sun in the inner asteroid belt at a distance of 1.8–2.7 AU once every 3 years and 4 months (1,211 days; semi-major axis of 2.22 AU). Its orbit has an eccentricity of 0.20 and an inclination of 6° with respect to the ecliptic.[2] The body's observation arc begins at Lowell Observatory in Flagstaff, the night prior to its official discovery observation at Heidelberg.[1]

    Physical characteristics

    Döllen is an assumed S-type asteroid,[3] which corresponds to the overall spectral type for Florian asteroids.[8]: 23 

    Rotation period

    In September 2012, a rotational lightcurve of Döllen was obtained from photometric observations by French amateur astronomer René Roy. Lightcurve analysis gave a tentative rotation period of 10 hours with a brightness amplitude of 0.10 magnitude (U=2-).[3][7]

    Diameter and albedo

    According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Döllen measures 3.389 kilometers in diameter and its surface has an albedo of 0.465,[5][6] while the Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from 8 Flora, the parent body of the Flora family – and calculates a diameter of 3.74 kilometers based on an absolute magnitude of 14.3.[3]

    Naming

    This minor planet was named after German astronomer Wilhelm Döllen (1820–1897), for his discussion on errors of heliometer observations. Döllen was an assistant of Friedrich Georg Wilhelm von Struve at the Dorpat Observatory (Tartu Observatory) in Estonia. He also worked on geodetic problems at the Pulkovo Observatory near Saint Petersburg, Russia.[1] The official naming citation was suggested by Lutz Schmadel and published by the Minor Planet Center on 6 August 2009 (M.P.C. 66724).[9]

    References
    1. "7449 Dollen (1949 QL)". Minor Planet Center. Retrieved 27 May 2018.
    2. "JPL Small-Body Database Browser: 7449 Dollen (1949 QL)" (2018-04-25 last obs.). Jet Propulsion Laboratory. Retrieved 27 May 2018.
    3. "LCDB Data for (7449) Döllen". Asteroid Lightcurve Database (LCDB). Retrieved 27 May 2018.
    4. "Asteroid 7449 Döllen". Small Bodies Data Ferret. Retrieved 27 May 2018.
    5. Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. S2CID 118745497.{{cite journal}}: CS1 maint: multiple names: authors list (link)
    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. S2CID 35447010. (catalog)
    7. Behrend, Raoul. "Asteroids and comets rotation curves – (7449) Döllen". Geneva Observatory. Retrieved 27 May 2018.
    8. Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families". Asteroids IV. pp. 297–321. arXiv:1502.01628. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. ISBN 9780816532131. S2CID 119280014.
    9. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 27 May 2018.

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