Astronomy:7548 Engström

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7548 Engström
Discovery [1]
Discovered byC.-I. Lagerkvist
Discovery siteLa Silla Obs.
Discovery date16 March 1980
Designations
(7548) Engström
Named afterAlbert Engström
(Swedish artist)[2]
1980 FW2 · 1993 QA4
1999 TS324
Minor planet categorymain-belt · Themis [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc36.88 yr (13,470 days)
|{{{apsis}}}|helion}}3.6490 AU
|{{{apsis}}}|helion}}2.6410 AU
3.1450 AU
Eccentricity0.1603
Orbital period5.58 yr (2,037 days)
Mean anomaly151.48°
Mean motion0° 10m 36.12s / day
Inclination0.3170°
Longitude of ascending node346.66°
296.30°
Physical characteristics
Dimensions7.70 km (calculated)[3]
9.43±3.04 km[4]
11.067±0.129 km[5][6]
Rotation period5.2309±0.0059 h[7]
Geometric albedo0.057±0.009[5][6]
0.06±0.05[4]
0.08 (assumed)[3]
C [3]
Absolute magnitude (H)13.5[1][5] · 13.93[3] · 13.477±0.005 (R)[7] · 13.64±0.21[8] · 13.75[4]


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]

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 ({{{1}}}).[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. ↑ 1.0 1.1 1.2 1.3 "JPL Small-Body Database Browser: 7548 Engstrom (1980 FW2)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2007548. 
  2. ↑ 2.0 2.1 2.2 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. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 "LCDB Data for (7548) Engstrom". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=7548%7CEngstrom. 
  4. ↑ 4.0 4.1 4.2 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. doi:10.3847/0004-6256/152/3/63. Bibcode: 2016AJ....152...63N. 
  5. ↑ 5.0 5.1 5.2 5.3 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. doi:10.1088/0004-637X/741/2/90. Bibcode: 2011ApJ...741...90M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...90M. Retrieved 17 May 2016. 
  6. ↑ 6.0 6.1 6.2 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. doi:10.1088/0004-637X/741/2/68. Bibcode: 2011ApJ...741...68M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...68M. Retrieved 4 December 2016. 
  7. ↑ 7.0 7.1 7.2 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. doi:10.1088/0004-6256/150/3/75. Bibcode: 2015AJ....150...75W. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015AJ....150...75W. 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. doi:10.1016/j.icarus.2015.08.007. Bibcode: 2015Icar..261...34V. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V. Retrieved 17 May 2016. 
  9. ↑ 9.0 9.1 "7548 Engstrom (1980 FW2)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=7548. 
  10. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html. 

External links



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