1370 Hella

Main-belt asteroid October 2019 yes 1370 Hella #D6D6D6 K. Reinmuth Heidelberg Obs. 31 August 1935 (1370) Hella 1935 QG Helene Nowacki(ARI-astronomer) main-belt(inner)Flora 4 September 2017 (JD 2458000.5) 0 81.46 yr (29,754 days) 2.6343 AU 1.8665 AU 2.2504 AU 0.1706 3.38 yr (1,233 days) 130.52° 0.2920 ms / day 4.8039° 306.04° 3.9960° 5.41 km (calculated) 7.5408 hinconclusive 0.24 (assumed) S (assumed) 13.513.69 0.63 1370 Hella, provisional designation 1935 QG, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 5.4 kilometers in diameter. It was discovered on 31 August 1935, by astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in southwest Germany. The asteroid was named for Helene Nowacki, an astronomer at the Astronomical Calculation Institute. Orbit and classification Hella is a member of the Flora family (402), a giant asteroid family and the largest family of stony asteroids in the main belt.23 It orbits the Sun in the inner asteroid belt at a distance of 1.9–2.6 AU once every 3 years and 5 months (1,233 days). Its orbit has an eccentricity of 0.17 and an inclination of 5° with respect to the ecliptic. The body's observation arc begins at Heidelberg in September 1935, one month after its official discovery observation. Physical characteristics According to its classification as a Florian asteroid, Hella is an assumed stony S-type asteroid. Rotation period In October 2006, a rotational lightcurve of Hella was obtained from photometric observations by French amateur astronomer Laurent Bernasconi. Lightcurve analysis gave an inconclusive rotation period of 7.5408 hours with a brightness amplitude of 0.17 magnitude (U=n.a.). The Lightcurve Data Base, however, only lists the measured brightness variation. As of 2017, no secure period of Hella has been obtained. Diameter and albedo Hella has not been observed by any of the space-based surveys, such as the Infrared Astronomical Satellite (IRAS), the Japanese Akari satellite or the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer. The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from 8 Flora the parent body of the Flora Family – and calculates a diameter of 5.41 kilometers based on an absolute magnitude of 13.5. Naming This minor planet was named after Helene Nowacki (1904–1972), a German astronomer of the Astronomical Calculation Institute. The name was suggested by astronomer Gustav Stracke. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 124). References 30em 2017-02-15 last obs. JPL Small-Body Database Browser: 1370 Hella (1935 QG) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001370 Jet Propulsion Laboratory 31 October 2017 Schmadel Lutz D. Dictionary of Minor Planet Names Springer Berlin Heidelberg 111 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1371 (1370) Hella 1370 Hella (1935 QG) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1370 31 October 2017 Asteroids and comets rotation curves – (1370) Hella Behrend Raoul Geneva Observatory http://obswww.unige.ch/~behrend/page4cou.html#001370 31 October 2017 3 August 2003 https://web.archive.org/web/20030803183423/http://obswww.unige.ch/~behrend/page4cou.html#001370 dead Asteroid 1370 Hella – Nesvorny HCM Asteroid Families V3.0 Small Bodies Data Ferret https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1370+Hella#Asteroid%201370%20HellaEAR-A-VARGBDET-5-NESVORNYFAM-V3.0 26 October 2019 28 July 2021 https://web.archive.org/web/20210728120647/https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1370+Hella#Asteroid%201370%20HellaEAR-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 1370 31 October 2017 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 31 October 2017 External links Asteroid Lightcurve Database (LCDB), query form (info https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html 16 December 2017 ) 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 – Observatoire de Genève, Raoul Behrend Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center 1370 1369 Ostanina 1370 1371 Resi 001370 Category:Discoveries by Karl Wilhelm Reinmuth Category:Named minor planets 19350831