1146 Biarmia

1146 Biarmia

Discovery[1]
Discovered by	G. Neujmin
Discovery site	Simeiz Obs.
Discovery date	7 May 1929
Designations
MPC designation	(1146) Biarmia
Pronunciation	/biˈɑːrmiə/[2]
Named after	Bjarmaland (Permia) (territory in Norse sagas)[3]
Alternative designations	1929 JF · 1941 WD1 A913 KA
Minor planet category	main-belt · (outer)[4]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	87.88 yr (32,098 days)
Aphelion	3.8212 AU
Perihelion	2.2678 AU
Semi-major axis	3.0445 AU
Eccentricity	0.2551
Orbital period (sidereal)	5.31 yr (1,940 days)
Mean anomaly	184.40°
Mean motion	0° 11^m 7.8^s / day
Inclination	17.067°
Longitude of ascending node	213.89°
Argument of perihelion	63.801°
Physical characteristics
Dimensions	21.59±1.52 km[5] 31.14±1.2 km[6] 32.39±0.97 km[7] 32.925±0.148 km[8] 38.567±0.735 km[9]
Synodic rotation period	5.33±0.01 h[10] 5.468±0.004 h[11] 5.4700±0.0002 h[12][a] 11.514±0.004 h[13] 21.6 h (retracted)[b]
Geometric albedo	0.1436±0.0147[9] 0.196±0.024[8] 0.219±0.015[7] 0.2190±0.018[6] 0.455±0.096[5]
Spectral type	Tholen = X[1][4] · M[9][14][15] B–V = 0.690[1] U–B = 0.247[1]
Absolute magnitude (H)	9.80[1][4][5][6][7][9] · 9.99±0.33[16]

1146 Biarmia, provisional designation 1929 JF, is a metallic background asteroid from the outer regions of the asteroid belt, approximately 32 kilometers in diameter. It was discovered on 7 May 1929, by Russian astronomer Grigory Neujmin at the Simeiz Observatory on the Crimean peninsula.[17] The asteroid was named for the Bjarmaland mentioned in Norse sagas.

Orbit and classification

Biarmia is not a member of any known asteroid family. It orbits the Sun in the outer main-belt at a distance of 2.3–3.8 AU once every 5 years and 4 months (1,940 days). Its orbit has an eccentricity of 0.26 and an inclination of 17° with respect to the ecliptic.[1]

The asteroid was first identified as A913 KA at Winchester Observatory (799) in June 1913. The body's observation arc begins with its official discovery observation at Simeiz.[17]

Physical characteristics

Biarmia has been characterized in several observations as a metallic M-type asteroid.[14][15][9] In the Tholen classification, it is an X-type asteroid which also includes the M-types as a subgroup.[1][4]

Rotation period

The best-rated rotational lightcurves of Biarmia were obtained from photometric observations at the Etscorn Observatory (719), New Mexico, and at the S.O.S. Observatory (H39) in Minnesota, United States. Lightcurve analysis gave a rotation period of 5.468 and 5.4700 hours with a brightness amplitude of 0.22 and 0.20 magnitude, respectively (U=3/3).[11][12][a]

Other observations received a lower rating or have since been retracted.[b] Warner's period of 11.514 hours was later revised to 5.33 (U=2).[10][13]

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, Biarmia measures between 21.59 and 38.567 kilometers in diameter and its surface has an albedo between 0.1436 and 0.455.[5][6][7][8][9]

The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, a stony albedo of 0.2190 and a diameter of 31.14 kilometers based on an absolute magnitude of 9.80.[4]

Naming

This minor planet was named for the Bjarmaland mentioned in Norse sagas. This legendary territory probably refers to the Russian region around Arkhangelsk on the White Sea near the Finnish border. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 107).[3]

Notes

1. Lightcurve plot of 1146 Biarmia with a period of 5.47 hours. Brian D. Warner. Note by Warner: "Originally reported in MPB 27, 4-6 with P = 11.514 and A = 0.32. Reanalysis found revised period of P = 5.33, which disagrees with the 5.47 found by Durkee. The curve above is plotted to the Durkee period, which does give a better fit than with 5.33 h."
2. Behrend (2008) web: obs. date: 27 January 2008. Rotation period 21.6 hours with a brightness amplitude of 0.07 mag. Summary figures for (1146) Biarmia at Collaborative Asteroid Lightcurve Link (CALL). Lightcurve was removed from website by Raoul Behrend.

References

1. "JPL Small-Body Database Browser: 1146 Biarmia (1929 JF)" (2017-03-24 last obs.). Jet Propulsion Laboratory. Archived from the original on 10 August 2020. Retrieved 8 September 2017.
2. 'Biarmian' in Eduard Muret (1891) Encyclopædic English–German and German–English Dictionary
3. Schmadel, Lutz D. (2007). "(1146) Biarmia". Dictionary of Minor Planet Names – (1146) Biarmia. Springer Berlin Heidelberg. p. 97. doi:10.1007/978-3-540-29925-7_1147. ISBN 978-3-540-00238-3.
4. "LCDB Data for (1146) Biarmia". Asteroid Lightcurve Database (LCDB). Retrieved 8 September 2017.
5. Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8.
6. 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. Retrieved 22 October 2019.
7. 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. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. (online, AcuA catalog p. 153)
8. 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. arXiv:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121.
9. 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.
10. Warner, Brian D. (January 2011). "Upon Further Review: III. An Examination of Previous Lightcurve Analysis from the Palmer Divide Observatory". The Minor Planet Bulletin. 38 (1): 21–23. Bibcode:2011MPBu...38...21W. ISSN 1052-8091.
11. Klinglesmith, Daniel A. III; Hanowell, Jesse; Warren, Curtis Alan (October 2014). "Lightcurves for Inversion Model Candidates". The Minor Planet Bulletin. 41 (4): 206–208. Bibcode:2014MPBu...41..206K. ISSN 1052-8091.
12. Durkee, Russell I. (October 2009). "The Lightcurves of 1146 Biarmia and 5598 Carlmurray". The Minor Planet Bulletin. 36 (4): 170. Bibcode:2009MPBu...36..170D. ISSN 1052-8091.
13. Warner, B. (March 2000). "Asteroid Photometry at the Palmer Divide Observatory". The Minor Planet Bulletin. 27: 4–6. Bibcode:2000MPBu...27....4W.
14. Fornasier, S.; Clark, B. E.; Dotto, E. (July 2011). "Spectroscopic survey of X-type asteroids". Icarus. 214 (1): 131–146. arXiv:1105.3380. Bibcode:2011Icar..214..131F. doi:10.1016/j.icarus.2011.04.022.
15. 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. Bibcode:2017Icar..284...30B. doi:10.1016/j.icarus.2016.11.003. hdl:11336/63617.
16. 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.
17. "1146 Biarmia (1929 JF)". Minor Planet Center. Retrieved 8 September 2017.

External links

• Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
• 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
• 1146 Biarmia at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 1146 Biarmia at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters