Astronomy:1070 Tunica

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1070 Tunica
Discovery[1]
Discovered byK. Reinmuth
Discovery siteHeidelberg Obs.
Discovery date1 September 1926
Designations
(1070) Tunica
Pronunciation/ˈtjuːnɪkə/[6]
Named afterPetrorhagia[2]
(flowering plant)
1926 RB · A903 SA
Minor planet categorymain-belt · (outer)[1][3]
background[4] · Ursula[5]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc114.03 yr (41,649 days)
|{{{apsis}}}|helion}}3.4882 AU
|{{{apsis}}}|helion}}2.9764 AU
3.2323 AU
Eccentricity0.0792
Orbital period5.81 yr (2,123 days)
Mean anomaly259.51°
Mean motion0° 10m 10.56s / day
Inclination16.963°
Longitude of ascending node165.32°
189.81°
Physical characteristics
Dimensions33.77±8.89 km[7]
33.79 km (calculated)[3]
36.68±0.86 km[8]
39.10±0.64 km[9]
39.131±0.423 km[10]
44.135±1.028 km[11]
Rotation period15.673±0.0067 h[12]
15.8±1.0 h[13]
Geometric albedo0.0476±0.0014[11]
0.057 (assumed)[3]
0.061±0.003[10]
0.068±0.003[9]
0.07±0.04[7]
0.076±0.011[8]
C (assumed)[3]
Absolute magnitude (H)10.60[8][9] · 10.634±0.001 (R)[12] · 10.70[7][11] · 10.76±0.29[14] · 10.8[1] · 11.08[3]


1070 Tunica, provisional designation 1926 RB, is a dark background asteroid from the outer regions of the asteroid belt, approximately 35 kilometers in diameter. It was discovered on 1 September 1926, by German astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in southwest Germany.[15] The asteroid was named after Petrorhagia, a flowering plant also known as "Tunica".[2]

Orbit and classification

Tunica is a non-family asteroid from the main belt's background population.[4] Conversely, it has also been considered a core member of the Ursula family.[5] It orbits the Sun in the outer main-belt at a distance of 3.0–3.5 AU once every 5 years and 10 months (2,123 days; semi-major axis of 3.23 AU). Its orbit has an eccentricity of 0.08 and an inclination of 17° with respect to the ecliptic.[1]

The body's observation arc begins with its identification as A903 SA at Heidelberg in September 1903, or 23 years prior to its official discovery observation.[15]

Physical characteristics

Tunica is an assumed C-type asteroid.[3]

Rotation period

In May 2017, a rotational lightcurve of Tunica was obtained from photometric observations by French amateur astronomer René Roy. Lightcurve analysis gave a rotation period of 15.8 hours with a brightness variation of 0.24 magnitude ({{{1}}}).[13] Another lightcurve obtained in the R-band by astronomers at the Palomar Transient Factory in February 2010 gave a period of 15.673 hours and an amplitude of 0.32 magnitude ({{{1}}}).[12]

Diameter and albedo

According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Tunica measures between 33.77 and 44.135 kilometers in diameter and its surface has an albedo between 0.0476 and 0.076.[7][8][9][10][11]

The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a diameter of 33.79 kilometers based on an absolute magnitude of 11.08.[3]

Naming

This minor planet was named after "Tunica" (Petrorhagia), a flowering plant derived from the common gillyflower.[2]

Reinmuth's flowers

Due to his many discoveries, Karl Reinmuth submitted a large list of 66 newly named asteroids in the early 1930s. The list covered his discoveries with numbers between (1009) and (1200). This list also contained a sequence of 28 asteroids, starting with 1054 Forsytia, that were all named after plants, in particular flowering plants (also see list of minor planets named after animals and plants).[16]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 "JPL Small-Body Database Browser: 1070 Tunica (1926 RB)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001070. Retrieved 6 December 2017. 
  2. ↑ 2.0 2.1 2.2 Schmadel, Lutz D. (2007). "(1070) Tunica". Dictionary of Minor Planet Names – (1070) Tunica. Springer Berlin Heidelberg. p. 91. doi:10.1007/978-3-540-29925-7_1071. ISBN 978-3-540-00238-3. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 "LCDB Data for (1070) Tunica". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1070%7CTunica. Retrieved 6 December 2017. 
  4. ↑ 4.0 4.1 "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. https://sbntools.psi.edu/ferret/PropertySearch/familyForm.action. Retrieved 6 December 2017. 
  5. ↑ 5.0 5.1 "Asteroid 1070 Tunica – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. https://newton.spacedys.com/astdys/index.php?pc=1.1.6&n=1070. 
  6. ↑ tunica (3rd ed.), Oxford University Press, September 2005, http://oed.com/search?searchType=dictionary&q=tunica  (Subscription or UK public library membership required.)
  7. ↑ 7.0 7.1 7.2 7.3 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 6 December 2017. 
  8. ↑ 8.0 8.1 8.2 8.3 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. doi:10.1088/2041-8205/759/1/L8. Bibcode: 2012ApJ...759L...8M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012ApJ...759L...8M. Retrieved 6 December 2017. 
  9. ↑ 9.0 9.1 9.2 9.3 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)
  10. ↑ 10.0 10.1 10.2 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. 
  11. ↑ 11.0 11.1 11.2 11.3 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. 
  12. ↑ 12.0 12.1 12.2 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 6 December 2017. 
  13. ↑ 13.0 13.1 Behrend, Raoul. "Asteroids and comets rotation curves – (1070) Tunica". Geneva Observatory. http://obswww.unige.ch/~behrend/page3cou.html#001070. Retrieved 11 August 2016. 
  14. ↑ 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 6 December 2017. 
  15. ↑ 15.0 15.1 "1070 Tunica (1926 RB)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=1070. Retrieved 6 December 2017. 
  16. ↑ Schmadel, Lutz D. (2007). "(1054) Forsytia". Dictionary of Minor Planet Names – (1054) Forsytia. Springer Berlin Heidelberg. p. 90. doi:10.1007/978-3-540-29925-7_1055. ISBN 978-3-540-00238-3. 

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