1075 Helina

Main-belt asteroid October 2019 yes 1075 Helina #D6D6D6 001075-asteroid shape model (1075) Helina.png Modelled shape of Helina from its lightcurve G. Neujmin Simeiz Obs. 29 September 1926 (1075) Helina 1926 SC1930 KV1965 CBA906 YGA916 WH Helij Neujmin(discoverer's son) main-belt(outer)Eos 4 September 2017 (JD 2458000.5) 0 110.85 yr (40,489 days) 3.3528 AU 2.6705 AU 3.0116 AU 0.1133 5.23 yr (1,909 days) 156.59° 0.1886 ms / day 11.523° 100.81° 250.61° 26.198 0.414 km30.39 7.76 km34.48 0.58 km35.52 km37.93 0.85 km 44.554 0.1526 h44.6768 0.0001 h44.6770 0.0002 hHanus-2016d44.677 0.001 h44.9 0.1 h (127.0°, −43.0.0°) (λ1/β1) (280.0°, −44.0°) (λ2/β2) 0.11 0.070.111 0.0050.12200.129 0.009 Tholen SUB–V 0.765U–B 0.370 10.10 0.4310.1510.3110.371 0.003 (R) 1075 Helina, provisional designation 1926 SC, is a stony Eos asteroid from the outer regions of the asteroid belt, approximately 34 km mi off us in diameter. It was discovered on 29 September 1926, by astronomer Grigory Neujmin at the Simeiz Observatory on the Crimean peninsula. The asteroid was named after the discoverer's son, Helij Neujmin. Orbit and classification Helina is a member the Eos family (606), the largest asteroid family of the outer main belt consisting of nearly 10,000 asteroids.23 It orbits the Sun in the outer asteroid belt at a distance of 2.7–3.4 AU once every 5 years and 3 months (1,909 days; semi-major axis of 3.01 AU). Its orbit has an eccentricity of 0.11 and an inclination of 12° with respect to the ecliptic. The asteroid was first identified as A906 YG at Heidelberg Observatory in December 1906. The body's observation arc begins at Simeiz Observatory in October 1926, nine days after its official discovery observation. Naming This minor planet was named after Helij Grigorevich Neujmin (1910–1982), a son of discoverer Grigory Neujmin. The author of the Dictionary of Minor Planet Names, Lutz Schmadel learned about the naming circumstances from Crimean astronomers I. I. Neyachenko and N. S. Chernykh (see 2325 Chernykh). Physical characteristics In the Tholen classification, Helina is a stony S-type asteroid with an unusual spectra (SU). Rotation period In March 2013, a rotational lightcurve of Helina was obtained from photometric observations in the R-band by astronomers at the Palomar Transient Factory in California. Lightcurve analysis gave a rotation period of 44.554 hours with a brightness variation of 0.91 magnitude (U=2). In April 2013, European amateur astronomers Matthieu Bachschmidt, Paul Krafft, Olivier Gerteis, Hubert Gully and Luc Arnold measured a period of 44.9 hours with an amplitude of 0.64 magnitude (U=3-). While not being a slow rotator, Helina has a longer-than average period. Its high brightness amplitude is also indicative for an elongated or irregular shape, rather than a spherical one. Poles The asteroid's lightcurve has also been modeled several times. It gave a concurring period of 44.6768 and 44.677 hours, respectively.Hanus-2016d Modelling in the 2018-study also gave two spin axis of (127.0°, −43.0.0°) and (280.0°, −44.0°) in ecliptic coordinates (λ, β). 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, Helina measures between 26.198 and 37.93 kilometers in diameter and its surface has an albedo between 0.11 and 0.129. The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is an albedo of 0.1220 and a diameter of 35.52 kilometers based on an absolute magnitude of 10.15. Notes Hanus-2016d Hanus (2016d) publication not indexed in ADS. Summary figures for (1075) Helina at LCDB References 30em 2017-10-30 last obs. JPL Small-Body Database Browser: 1075 Helina (1926 SC) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001075 Jet Propulsion Laboratory 6 December 2017 Schmadel Lutz D. Dictionary of Minor Planet Names Springer Berlin Heidelberg (1075) Helina 92 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1076 1075 Helina (1926 SC) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1075 6 December 2017 Asteroids and comets rotation curves – (1075) Helina Behrend Raoul Geneva Observatory http://obswww.unige.ch/~behrend/page3cou.html#001075 6 December 2017 3 December 2002 https://web.archive.org/web/20021203214643/http://obswww.unige.ch/~behrend/page3cou.html#001075 dead E. F. Tedesco P. V. Noah M. Noah S. D. Price October 2004 IRAS Minor Planet Survey V6.0 https://sbnarchive.psi.edu/pds3/iras/IRAS_A_FPA_3_RDR_IMPS_V6_0/data/diamalb.tab NASA Planetary Data System 12 IRAS-A-FPA-3-RDR-IMPS-V6.0 2004PDSS...12.....T 22 October 2019 Asteroid 1075 Helina – Nesvorny HCM Asteroid Families V3.0 Small Bodies Data Ferret https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1075+Helina#Asteroid%201075%20HelinaEAR-A-VARGBDET-5-NESVORNYFAM-V3.0 26 October 2019 3 October 2020 https://web.archive.org/web/20201003181949/https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1075+Helina#Asteroid%201075%20HelinaEAR-A-VARGBDET-5-NESVORNYFAM-V3.0 dead D. Nesvorný M. Broz V. Carruba December 2014 Identification and Dynamical Properties of Asteroid Families Asteroids IV 297–321 2015aste.book..297N 10.2458/azu_uapress_9780816532131-ch016 1502.01628 9780816532131 1075 6 December 2017 6 Joseph R. Masiero A. K. Mainzer T. Grav J. M. Bauer R. M. Cutri C. Nugent M. S. Cabrera November 2012 Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012ApJ...759L...8M The Astrophysical Journal Letters 759 1 5 2012ApJ...759L...8M 10.1088/2041-8205/759/1/L8 1209.5794 6 December 2017 6 C. R. Nugent A. Mainzer J. Bauer R. M. Cutri E. A. Kramer T. Grav J. Masiero S. Sonnett E. L. Wright September 2016 NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos The Astronomical Journal 152 3 12 2016AJ....152...63N 10.3847/0004-6256/152/3/63 1606.08923 free 6 Fumihiko Usui Daisuke Kuroda Thomas G. Müller Sunao Hasegawa Masateru Ishiguro Takafumi Ootsubo Daisuke Ishihara Hirokazu Kataza Satoshi Takita Shinki Oyabu Munetaka Ueno Hideo Matsuhara Takashi Onaka October 2011 Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey Publications of the Astronomical Society of Japan 63 5 1117–1138 2011PASJ...63.1117U 10.1093/pasj/63.5.1117 free (online, AcuA catalog p. 153) 6 Adam Waszczak Chan-Kao Chang Eran O. Ofek Russ Laher Frank Masci David Levitan Jason Surace Yu-Chi Cheng Wing-Huen Ip Daisuke Kinoshita George Helou Thomas A. Prince Shrinivas Kulkarni September 2015 Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015AJ....150...75W The Astronomical Journal 150 3 35 2015AJ....150...75W 10.1088/0004-6256/150/3/75 1504.04041 6 December 2017 J. Durech J. Hanus D. Oszkiewicz R. Vanco March 2016 Asteroid models from the Lowell photometric database http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2016A&A...587A..48D Astronomy and Astrophysics 587 6 2016A&A...587A..48D 10.1051/0004-6361/201527573 1601.02909 6 December 2017 6 J. Hanus M. Delbo' V. Alí-Lagoa B. Bolin R. Jedicke J. Durech H. Cibulková P. Pravec P. Kusnirák R. Behrend F. Marchis P. Antonini L. Arnold M. Audejean M. Bachschmidt L. Bernasconi L. Brunetto S. Casulli R. Dymock N. Esseiva M. Esteban O. Gerteis H. de Groot H. Gully Hiroko Hamanowa Hiromi Hamanowa P. Krafft M. Lehký F. Manzini J. Michelet E. Morelle J. Oey F. Pilcher F. Reignier R. Roy P. A. Salom B. D. Warner January 2018 Spin states of asteroids in the Eos collisional family Icarus 299 84–96 2018Icar..299...84H 10.1016/j.icarus.2017.07.007 1707.05507 6 Peter Veres Robert Jedicke Alan Fitzsimmons Larry Denneau Mikael Granvik Bryce Bolin Serge Chastel Richard J. Wainscoat William S. Burgett Kenneth C. Chambers Heather Flewelling Nick Kaiser Eugen A. Magnier Jeff S. Morgan Paul A. Price John L. Tonry Christopher Waters November 2015 Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V Icarus 261 34–47 2015Icar..261...34V 10.1016/j.icarus.2015.08.007 1506.00762 6 December 2017 External links Lightcurve Database Query (LCDB), at www.minorplanet.info Dictionary of Minor Planet Names, Google books Asteroids and comets rotation curves, CdR https://web.archive.org/web/20160729213840/http://obswww.unige.ch/~behrend/page_cou.html 29 July 2016 – Geneva Observatory, Raoul Behrend Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center 1075 1074 Beljawskya 1075 1076 Viola 001075 Category:Discoveries by Grigory Neujmin Category:Named minor planets 001075 19260929