Astronomy:1455 Mitchella
| Discovery[1] | |
|---|---|
| Discovered by | A. Bohrmann |
| Discovery site | Heidelberg Obs. |
| Discovery date | 5 June 1937 |
| Designations | |
| (1455) Mitchella | |
| Named after | Maria Mitchell[2] (American astronomer) |
| 1937 LF · 1947 LB 1978 QR3 | |
| Minor planet category | main-belt · (inner) Flora[3] · background[4] |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 79.81 yr (29,152 days) |
| |{{{apsis}}}|helion}} | 2.5273 AU |
| |{{{apsis}}}|helion}} | 1.9665 AU |
| 2.2469 AU | |
| Eccentricity | 0.1248 |
| Orbital period | 3.37 yr (1,230 days) |
| Mean anomaly | 321.18° |
| Mean motion | 0° 17m 33.36s / day |
| Inclination | 7.7548° |
| Longitude of ascending node | 128.33° |
| 100.60° | |
| Physical characteristics | |
| Dimensions | 6.449±0.170 km[5] 6.55±1.51 km[6] 6.646±0.102 km[7] 7.00±1.56 km[8] 7.47 km (calculated)[3] |
| Rotation period | 118.7±0.5 h[lower-alpha 1] |
| Geometric albedo | 0.24 (assumed)[3] 0.26±0.12[6] 0.31±0.17[8] 0.3333±0.0453[7] 0.353±0.097[5] |
| S (assumed)[3] | |
| Absolute magnitude (H) | 12.7[7] · 12.80[8][1][3] · 13.03[6] · 13.27±0.31[9] |
1455 Mitchella, provisional designation 1937 LF, is a Florian asteroid, slow rotator and suspected tumbler from the inner regions of the asteroid belt, approximately 7 kilometers in diameter. It was discovered on 5 June 1937, by astronomer Alfred Bohrmann at the Heidelberg-Königstuhl State Observatory in southwest Germany.[10] The asteroid was named after American astronomer Maria Mitchell.[2]
Orbit and classification
Mitchella is a non-family asteroid of the main belt's background population when applying the Hierarchical Clustering Method to its proper orbital elements.[4] It has also been classified as a member of the Flora family (402), a giant asteroid family and the largest family of stony asteroids in the main-belt.[3]
It orbits the Sun in the inner main-belt at a distance of 2.0–2.5 AU once every 3 years and 4 months (1,230 days). Its orbit has an eccentricity of 0.12 and an inclination of 8° with respect to the ecliptic.[1] The body's observation arc begins at Heidelberg, one month after its official discovery observation.[10]
Physical characteristics
Mitchella is an assumed stony S-type asteroid,[3] which is also the overall spectral type for members of the Flora family.
Rotation period
In June 2006, a rotational lightcurve of Mitchella was obtained from photometric observations by Australian astronomer David Higgins at the Hunters Hill Observatory (E14). Lightcurve analysis gave a rotation period of 118.7 hours with a brightness variation of 0.60 magnitude ({{{1}}}).[lower-alpha 1] With a period above 100 hours, Mitchella is one of few hundred slow rotators currently known to exists. Its high brightness amplitude is indicative for a somewhat elongated shape. Also, the photometric observations suggested that it might be in a tumbling motion.[lower-alpha 1]
Diameter and albedo
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Mitchella measures between 6.449 and 7.00 kilometers in diameter and its surface has an albedo between 0.26 and 0.353.[5][6][7][8]
The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from 8 Flora, the Flora family's parent body – and calculates a diameter of 7.47 kilometers based on an absolute magnitude of 12.8.[3]
Naming
This minor planet was named after Maria Mitchell (1818–1889), an American professor of astronomy and director of Vassar College Observatory. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 131).[2] The lunar crater Mitchell is also named in her honor, as is the Maria Mitchell Observatory in, Massachusetts, United States.[2]
Notes
- ↑ 1.0 1.1 1.2 Higgins (2011) web: rotation period 118.7±0.5 hours with a brightness amplitude of 0.60 mag. Summary figures for (1455) Mitchella at LCDB and David Higgins' archived website
References
- ↑ 1.0 1.1 1.2 1.3 "JPL Small-Body Database Browser: 1455 Mitchella (1937 LF)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001455.
- ↑ 2.0 2.1 2.2 2.3 Schmadel, Lutz D. (2007). "(1455) Mitchella". Dictionary of Minor Planet Names – (1455) Mitchella. Springer Berlin Heidelberg. p. 117. doi:10.1007/978-3-540-29925-7_1456. ISBN 978-3-540-00238-3.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 "LCDB Data for (1455) Mitchella". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1455%7CMitchella.
- ↑ 4.0 4.1 "Asteroid 1455 Mitchella – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. https://newton.spacedys.com/astdys/index.php?pc=1.1.6&n=1455.
- ↑ 5.0 5.1 5.2 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 21 October 2017.
- ↑ 6.0 6.1 6.2 6.3 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.
- ↑ 7.0 7.1 7.2 7.3 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.
- ↑ 8.0 8.1 8.2 8.3 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 21 October 2017.
- ↑ 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 21 October 2017.
- ↑ 10.0 10.1 "1455 Mitchella (1937 LF)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=1455.
External links
- Asteroid Lightcurve Database (LCDB), query form (info )
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- 1455 Mitchella at AstDyS-2, Asteroids—Dynamic Site
- 1455 Mitchella at the JPL Small-Body Database
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