Astronomy:2035 Stearns

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2035 Stearns
Discovery [1]
Discovered byJ. B. Gibson
Discovery siteEl Leoncito Complex
Discovery date21 September 1973
Designations
(2035) Stearns
Named afterCarl Leo Stearns [1]
(American astronomer)
1973 SC · 1973 UG
Minor planet categoryMars-crosser [2]
Hungaria [1][3]
Orbital characteristics [2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc44.35 yr (16,199 d)
|{{{apsis}}}|helion}}2.1317 AU
|{{{apsis}}}|helion}}1.6366 AU
1.8841 AU
Eccentricity0.1314
Orbital period2.59 yr (945 d)
Mean anomaly134.07°
Mean motion0° 22m 51.96s / day
Inclination27.751°
Longitude of ascending node77.035°
200.71°
Earth MOID0.6305 AU (245 LD)
Mars MOID0.1655 AU
Physical characteristics
Mean diameter4.82±0.52 km[4]
5.28 km (derived)[3]
6.00±1.20 km[5]
Rotation period51.89±0.20 h[6]
85±0.1 h[7]
93±1 h[8][lower-alpha 1]
Geometric albedo0.40 (assumed)[3]
0.443±0.177[5]
0.65±0.30[4]
Tholen = E [2]
SMASS = Xe [2][3][9]
B–V = 0.737[2]
U–B = 0.280[2]
V–R = 0.440[7]
Absolute magnitude (H)12.61[2][4][5]
13.0[3][10]


2035 Stearns, provisional designation 1973 SC, is a bright Hungaria asteroid and sizable Mars-crosser inside the inner regions of the asteroid belt, approximately 6 kilometers (3.7 miles) in diameter. It was discovered on 21 September 1973, by American astronomer James Gibson at the Leoncito Astronomical Complex in Argentina.[1] The transitional E-type asteroid has a long rotation period of 93 hours.[3] It was named after American astronomer Carl Leo Stearns.[1]

Orbit and classification

Stearns is a dynamical Hungaria asteroid, a large group that forms the innermost dense concentration of asteroids in the Solar System.[1][3] It is also a Mars-crossing asteroid, a member of the dynamically unstable group, located between the main belt and near-Earth populations, and crossing the orbit of Mars at 1.666 AU.[2]

The asteroid orbits the Sun in the inner main-belt at a distance of 1.64–2.13 AU once every 2 years and 7 months (945 days; semi-major axis of 1.88 AU). Its orbit has an eccentricity of 0.13 and an inclination of 28° with respect to the ecliptic.[2]

The body's observation arc begins with a precovery taken at Palomar Observatory in January 1954, nearly 20 years prior to its official discovery observation at Leoncito.[1]

Physical characteristics

In the Tholen classification, Stearns is a bright E-type asteroid.[2] while in the SMASS classification and Bus-DeMeo taxonomy, it is an Xe-subtype that transitions from the X-type to the E-type.[9]

Rotation period

Several rotational lightcurve of Stearns have been obtained from photometric observations since 1988.[6][7][8] Analysis of the best-rated lightcurve by Robert Stephens at the Center for Solar System Studies (U81) gave a rotation period of 93 hours with a brightness amplitude of 0.20 magnitude ({{{1}}}). This makes the asteroid as close slow rotator.[3][lower-alpha 1]

Diameter and albedo

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Stearns measures between 4.82 and 6.00 kilometers in diameter and its surface has an albedo between 0.443 and 0.65.[4][5] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for members of the Hungaria family of 0.40, and derives a diameter of 5.28 kilometers based on an absolute magnitude of 13.0.[3]

Naming

This minor planet was named after Carl Leo Stearns (1892–1972), American astronomer at Wesleyan University and Van Vleck Observatory who measured a large number of stellar parallaxes.[1] The official naming citation was published by the Minor Planet Center on 1 November 1978 (M.P.C. 4548).[11] The lunar crater Stearns was also named in his honor.

Notes

  1. ↑ 1.0 1.1 Lightcurve plot of (2035) Stearns with a rotation period 93±1 hours with a brightness amplitude of 0.20 mag. Taken by Robert Stephens at the Center for Solar System Studies (CS3) in 2014. Quality code is 2+. Summary figures at the LCDB.

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 "2035 Stearns (1973 SC)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=2035. Retrieved 25 May 2018. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 "JPL Small-Body Database Browser: 2035 Stearns (1973 SC)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2002035. Retrieved 25 May 2018. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 "LCDB Data for (2035) Stearns". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=2035%7CStearns. Retrieved 25 May 2018. 
  4. ↑ 4.0 4.1 4.2 4.3 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. 
  5. ↑ 5.0 5.1 5.2 5.3 Alí-Lagoa, V.; Delbo', M. (July 2017). "Sizes and albedos of Mars-crossing asteroids from WISE/NEOWISE data". Astronomy and Astrophysics 603: 8. doi:10.1051/0004-6361/201629917. Bibcode: 2017A&A...603A..55A. 
  6. ↑ 6.0 6.1 Warner, Brian D. (July 2011). "Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2010 December- 2011 March". The Minor Planet Bulletin 38 (3): 142–149. ISSN 1052-8091. Bibcode: 2011MPBu...38..142W. 
  7. ↑ 7.0 7.1 7.2 Shevchenko, V. G.; Krugly, Yu. N.; Chiorny, V. G.; Belskaya, I. N.; Gaftonyuk, N. M. (August 2003). "Rotation and photometric properties of E-type asteroids". Planetary and Space Science 51 (9–10): 525–532. doi:10.1016/S0032-0633(03)00076-X. Bibcode: 2003P&SS...51..525S. 
  8. ↑ 8.0 8.1 Stephens, Robert D. (October 2014). "Asteroids Observed from CS3: 2014 April-June". The Minor Planet Bulletin 41 (4): 226–230. ISSN 1052-8091. Bibcode: 2014MPBu...41..226S. 
  9. ↑ 9.0 9.1 "Asteroid 2035 Stearns". Small Bodies Data Ferret. https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=2035+Stearns. Retrieved 25 May 2018. 
  10. ↑ Wisniewski, W. Z.; Michalowski, T. M.; Harris, A. W.; McMillan, R. S. (March 1995). "Photoelectric Observations of 125 Asteroids". Abstracts of the Lunar and Planetary Science Conference 26: 1511. Bibcode: 1995LPI....26.1511W. 
  11. ↑ Schmadel, Lutz D. (2009). "Appendix – Publication Dates of the MPCs". Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008). Springer Berlin Heidelberg. p. 221. doi:10.1007/978-3-642-01965-4. ISBN 978-3-642-01964-7. Bibcode: 2009dmpn.book.....S. https://cds.cern.ch/record/1339661. 

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