Astronomy:1021 Flammario

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1021 Flammario
001021-asteroid shape model (1021) Flammario.png
Shape model of Flammario from its lightcurve
Discovery[1]
Discovered byM. F. Wolf
Discovery siteHeidelberg Obs.
Discovery date11 March 1924
Designations
(1021) Flammario
Named afterCamille Flammarion[2]
(French astronomer)
1924 RG · 1977 UM
A910 CE
Minor planet categorymain-belt[1][3] · (outer)[4]
background[5]
Orbital characteristics[3]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc92.70 yr (33,857 d)
|{{{apsis}}}|helion}}3.5188 AU
|{{{apsis}}}|helion}}1.9556 AU
2.7372 AU
Eccentricity0.2855
Orbital period4.53 yr (1,654 d)
Mean anomaly10.840°
Mean motion0° 13m 3.36s / day
Inclination15.869°
Longitude of ascending node115.44°
286.97°
Physical characteristics
Mean diameter84.78±22.26 km[6]
97.38±1.23 km[7]
97.96±34.85 km[8]
98.015±8.377 km[9]
99.27±3.27 km[10]
99.39±2.3 km[11]
99.6±19.9 km[12]
100.765±1.608 km[13]
105±11 km[14]
Mass(5.14±0.12)×1018 kg[10]
Mean density10.03±1.02 g/cm3[10]
Rotation period12.146±0.001 h[15]
12.146 h[16][17]
12.15186±0.00005 h[18]
12.160±0.002 h[19]
12.16 h[19]
Geometric albedo0.04±0.01[14]
0.04±0.06[8]
0.045±0.006[13]
0.0458±0.002[11]
0.0470±0.0200[9]
0.048±0.001[7]
0.05±0.02[6][12]
Tholen = F[3] · F[20]
SMASS = B[3][4]
B–V = 0.656[3]
U–B = 0.230[3]
Absolute magnitude (H)8.98[3][4][7][6][9][11][12][14]
9.03[8] · 9.34±0.27[21]


1021 Flammario, provisional designation 1924 RG, is a dark background asteroid from the central regions of the asteroid belt, approximately 100 kilometers (62 miles) in diameter. It was discovered on 11 March 1924, by German astronomer Max Wolf at the Heidelberg-Königstuhl State Observatory in Heidelberg, Germany.[1] The asteroid was named after French astronomer Camille Flammarion.[2] The uncommon F-type asteroid has a rotation period of 12.16 hours.[4]

Orbit and classification

Flammario is a non-family asteroid from the main belt's background population.[5] It orbits the Sun in the central asteroid belt at a distance of 2.0–3.5 AU once every 4 years and 6 months (1,654 days; semi-major axis of 2.74 AU). Its orbit has an eccentricity of 0.29 and an inclination of 16° with respect to the ecliptic.[3]

The asteroid was first observed as A910 CE at Taunton Observatory (803) in February 1910. The body's observation arc begins at the Pulkovo Observatory near Saint Petersburg, Russia, in January 1928, more than four years after its official discovery observation at Heidelberg.[1]

Physical characteristics

In the SMASS classification, Flammario is a "bright" carbonaceous B-type, while it is an uncommon F-type asteroid in the Tholen taxonomy. (The SMASS taxonomic scheme classifies all F-types as B-type asteroids).[3][4] More recent polarimetric observations also characterized the asteroid as a dark F-type.[20]

Rotation period

Several rotational lightcurves of Flammario have been obtained from photometric observations since the 1990s ({{{1}}}).[15][16][17] Analysis of the best-rated lightcurve obtained by French amateur astronomer Laurent Bernasconi in January 2005 gave a rotation period of 12.160 hours with a consolidated brightness amplitude between 0.14 and 0.40 magnitude ({{{1}}}).[4][19]

Poles

In 2016, a modeled lightcurve using photometric data from various sources, rendered a similar sidereal period of 12.15186 hours and two spin axes of (32.0°, 22.0°) and (216.0°, 55.0°) in ecliptic coordinates.[18]

Diameter and albedo

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Flammario measures between 84.78 and 105 kilometers in diameter and its surface has a low albedo between 0.04 and 0.05.[6][7][8][9][11][12][13][14]

The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.0458 and a diameter of 99.39 kilometers based on an absolute magnitude of 8.98.[4]

Mass, density and porosity

Flammario has an estimated mass of (5.14±0.12)×1018 kg with a theoretical bulk density of 10.03±1.02 g/cm3 (marked as unrealistically high by the author of the publication) due to its low macroporosity, i.e. the lack of voids within the body.[10] Small Solar System bodies may have 20% of more porosity (which decreases with the size of the body due to self-gravity). The carbonaceous outer-belt asteroids typically show a higher macroporosity than the basaltic, stony asteroids from the inner regions of the asteroid belt.[10]

Naming

This minor planet was named after renowned French astronomer Camille Flammarion (1842–1925), who founded the French Astronomical Society (French: Société astronomique de France) and the astronomical journal L'Astronomie in the 1880s. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 98). The lunar crater Flammarion as well as the crater Flammarion on Mars were also named in his honor.[2]

References

  1. ↑ 1.0 1.1 1.2 1.3 "1021 Flammario (1924 RG)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=1021. Retrieved 13 March 2018. 
  2. ↑ 2.0 2.1 2.2 Schmadel, Lutz D. (2007). "(1021) Flammario". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 88. doi:10.1007/978-3-540-29925-7_1022. ISBN 978-3-540-00238-3. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 "JPL Small-Body Database Browser: 1021 Flammario (1924 RG)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001021. Retrieved 13 March 2018. 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 "LCDB Data for (1021) Flammario". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1021%7CFlammario. Retrieved 13 March 2018. 
  5. ↑ 5.0 5.1 "Asteroid 1021 Flammario – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1021+Flammario. Retrieved 24 October 2019. 
  6. ↑ 6.0 6.1 6.2 6.3 Nugent, C. R.; Mainzer, A.; Masiero, J.; Bauer, J.; Cutri, R. M.; Grav, T. et al. (December 2015). "NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos". The Astrophysical Journal 814 (2): 13. doi:10.1088/0004-637X/814/2/117. Bibcode: 2015ApJ...814..117N. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015ApJ...814..117N. Retrieved 13 March 2018. 
  7. ↑ 7.0 7.1 7.2 7.3 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. doi:10.1093/pasj/63.5.1117. Bibcode: 2011PASJ...63.1117U.  (online, AcuA catalog p. 153)
  8. ↑ 8.0 8.1 8.2 8.3 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. 
  9. ↑ 9.0 9.1 9.2 9.3 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. 
  10. ↑ 10.0 10.1 10.2 10.3 10.4 Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science 73 (1): 98–118, doi:10.1016/j.pss.2012.03.009, Bibcode: 2012P&SS...73...98C  See Table 1.
  11. ↑ 11.0 11.1 11.2 11.3 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. https://sbnarchive.psi.edu/pds3/iras/IRAS_A_FPA_3_RDR_IMPS_V6_0/data/diamalb.tab. Retrieved 22 October 2019. 
  12. ↑ 12.0 12.1 12.2 12.3 Alí-Lagoa, V.; Licandro, J.; Gil-Hutton, R.; Cañ; ada-Assandri, M.; Delbo', M. et al. (June 2016). "Differences between the Pallas collisional family and similarly sized B-type asteroids". Astronomy and Astrophysics 591: 11. doi:10.1051/0004-6361/201527660. Bibcode: 2016A&A...591A..14A. 
  13. ↑ 13.0 13.1 13.2 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. doi:10.1088/0004-637X/791/2/121. Bibcode: 2014ApJ...791..121M. 
  14. ↑ 14.0 14.1 14.2 14.3 Alí-Lagoa, V.; de León, J.; Licandro, J.; Delbó, M.; Campins, H.; Pinilla-Alonso, N. et al. (June 2013). "Physical properties of B-type asteroids from WISE data". Astronomy and Astrophysics 554: 16. doi:10.1051/0004-6361/201220680. Bibcode: 2013A&A...554A..71A. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2013A&A...554A..71A. Retrieved 13 March 2018. 
  15. ↑ 15.0 15.1 Buchheim, Robert K. (December 2005). "Asteroid photometry reports from Altimira Observatory - Winter 2004-2005". The Minor Planet Bulletin 32 (4): 79–80. ISSN 1052-8091. Bibcode: 2005MPBu...32...79B. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2005MPBu...32...79B. Retrieved 13 March 2018. 
  16. ↑ 16.0 16.1 Hainaut-Rouelle, M.-C.; Hainaut, O. R.; Detal, A. (July 1995). "Lightcurves of selected minor planets.". Astronomy and Astrophysics Supplement 112: 125. Bibcode: 1995A&AS..112..125H. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=1995A&AS..112..125H. Retrieved 13 March 2018. 
  17. ↑ 17.0 17.1 Schober, H. J.; Erikson, A.; Hahn, G.; Lagerkvist, C. I.; Oja, T. (November 1993). "Physical Studies of Asteroids. Part XXVI. Rotation and Photoelectric Photometry of Asteroids 323, 350, 582, 1021 and 1866". Astronomy and Astrophysics Supplement 101 (3): 507. Bibcode: 1993A&AS..101..499S. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=1993A&AS..101..499S. Retrieved 13 March 2018. 
  18. ↑ 18.0 18.1 Hanus, J.; Durech, J.; Oszkiewicz, D. A.; Behrend, R.; Carry, B.; Delbo, M. et al. (February 2016). "New and updated convex shape models of asteroids based on optical data from a large collaboration network". Astronomy and Astrophysics 586: 24. doi:10.1051/0004-6361/201527441. Bibcode: 2016A&A...586A.108H. 
  19. ↑ 19.0 19.1 19.2 Behrend, Raoul. "Asteroids and comets rotation curves – (1021) Flammario". Geneva Observatory. http://obswww.unige.ch/~behrend/page3cou.html#001021. Retrieved 13 March 2018. 
  20. ↑ 20.0 20.1 Belskaya, I. N.; Fornasier, S.; Tozzi, G. P.; Gil-Hutton, R.; Cellino, A.; Antonyuk, K. et al. (March 2017). "Refining the asteroid taxonomy by polarimetric observations". Icarus 284: 30–42. doi:10.1016/j.icarus.2016.11.003. Bibcode: 2017Icar..284...30B. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2017Icar..284...30B. Retrieved 13 March 2018. 
  21. ↑ 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 13 March 2018. 

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