7548 Engström

7548 Engström, provisional designation 1980 FW2, is dark Themistian asteroid from the outer region of the asteroid belt, approximately 9 kilometers in diameter. It was discovered on 16 March 1980, by Swedish astronomer Claes-Ingvar Lagerkvist at ESO's La Silla Observatory site in northern Chile.[9] The asteroid was later named after Swedish artist Albert Engström.[2]

7548 Engström
Discovery [1]
Discovered byC.-I. Lagerkvist
Discovery siteLa Silla Obs.
Discovery date16 March 1980
Designations
(7548) Engström
Named after
Albert Engström
(Swedish artist)[2]
1980 FW2 · 1993 QA4
1999 TS324
main-belt · Themis [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc36.88 yr (13,470 days)
Aphelion3.6490 AU
Perihelion2.6410 AU
3.1450 AU
Eccentricity0.1603
5.58 yr (2,037 days)
151.48°
0° 10m 36.12s / day
Inclination0.3170°
346.66°
296.30°
Physical characteristics
Dimensions7.70 km (calculated)[3]
9.43±3.04 km[4]
11.067±0.129 km[5][6]
5.2309±0.0059 h[7]
0.057±0.009[5][6]
0.06±0.05[4]
0.08 (assumed)[3]
C [3]
13.5[1][5] · 13.93[3] · 13.477±0.005 (R)[7] · 13.64±0.21[8] · 13.75[4]

    Classification and orbit

    Engström is a member of the Themis family, a dynamical family of outer-belt asteroids with nearly coplanar ecliptical orbits. It orbits the Sun at a distance of 2.6–3.6 AU once every 5 years and 7 months (2,037 days). Its orbit has an eccentricity of 0.16 and an inclination of 0° with respect to the ecliptic.[1]

    The asteroid's observation arc begins with its official discovery observation at La Silla.[9]

    Physical characteristics

    Engström is an assumed carbonaceous C-type asteroid.[3]

    Rotation period

    In September 2010, photometric observations by astronomers at the Palomar Transient Factory in California gave a rotational lightcurve with a period of 5.2309 hours and a brightness amplitude of 0.35 magnitude (U=2).[7]

    Diameter and albedo

    According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Engström measures 9.43 and 11.1 kilometers in diameter and its surface has a low albedo of 0.057 and 0.060, respectively,[5][6] while the Collaborative Asteroid Lightcurve Link (CALL) assumes an albedo of 0.08 and calculates a smaller diameter of 7.7 kilometers, based on an absolute magnitude of 13.93.[3]

    Naming

    This minor planet was named after Albert Engström (1869–1940), Swedish artist and author, who became a member of the esteemed Swedish academy in 1922. He was born in Lönneberga, Småland. After his studies of Greek and Latin at Uppsala University, he went on to Valand School of Fine Arts in Gothenburg. Renowned painter of caricatures and founder of the humor magazine Strix, he is best known for his black and white illustrations.[2] The official naming citation was published on 11 April 1998 (M.P.C. 31611).[10]

    References
    1. "JPL Small-Body Database Browser: 7548 Engstrom (1980 FW2)" (2017-01-31 last obs.). Jet Propulsion Laboratory. Retrieved 4 July 2017.
    2. Schmadel, Lutz D. (2007). "(7548) Engström". Dictionary of Minor Planet Names – (7548) Engström. Springer Berlin Heidelberg. p. 603. doi:10.1007/978-3-540-29925-7_6547. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (7548) Engstrom". Asteroid Lightcurve Database (LCDB). Retrieved 14 April 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 28 April 2017.
    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. Retrieved 17 May 2016.
    6. 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. Retrieved 4 December 2016.
    7. Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David; et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal. 150 (3): 35. arXiv:1504.04041. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved 17 May 2016.
    8. 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 17 May 2016.
    9. "7548 Engstrom (1980 FW2)". Minor Planet Center. Retrieved 14 April 2016.
    10. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 17 May 2016.

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