Astronomy:699 Hela
.png) Lightcurve-based 3D-model of Hela | |
| Discovery | |
|---|---|
| Discovered by | J. Helffrich |
| Discovery site | Heidelberg |
| Discovery date | 5 June 1910 |
| Designations | |
| (699) Hela | |
| Pronunciation | /ˈhiːlə/[2] |
| 1910 KD | |
| Minor planet category | Mars crosser[1] |
| Orbital characteristics[1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 113.38 yr (41,411 d) |
| |{{{apsis}}}|helion}} | 3.6831 astronomical unit|AU (550.98 Gm) |
| |{{{apsis}}}|helion}} | 1.5414 AU (230.59 Gm) |
| 2.6123 AU (390.79 Gm) | |
| Eccentricity | 0.40995 |
| Orbital period | 4.22 yr (1,542.1 d) |
| Mean anomaly | 3.93957° |
| Mean motion | 0° 14m 0.384s / day |
| Inclination | 15.297° |
| Longitude of ascending node | 242.548° |
| 91.479° | |
| Earth MOID | 0.62609 AU (93.662 Gm) |
| Mars MOID | 0.4063 AU (60.78 Gm) |
| Jupiter MOID | 2.10581 AU (315.025 Gm) |
| TJupiter | 3.239 |
| Physical characteristics | |
| Dimensions | 12 - 27 km[3] |
| Rotation period | 3.3962 h (0.14151 d)[1] |
| Absolute magnitude (H) | 11.72[1] |
699 Hela is a Mars crossing asteroid. It was discovered on 5 June 1910 at Heidelberg by German astronomer Joseph Helffrich, and may have been named after Hel, the Norse ruler of the underworld.[4] This asteroid is orbiting the Sun at a distance of 2.61 astronomical unit|AU with a period of 4.22 years and an eccentricity of 0.41. The orbital plane is inclined at an angle of 15.3° to the plane of the ecliptic.[1]
With an absolute magnitude of 11.7,[1] the asteroid is about 12–27 km in diameter.[3] It is classified as a stony Sk[5] or Sq-type[1] asteroid in the SMASS taxonomy. Photometry data used to produce light curves provide a rotation period of 3.39624±0.00006 h. The lightcurve inversion method was used to build a shape model with a rounded form and an equatorial bulge.[6]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 "JPL Small-Body Database Browser: 699 Hela (1910 KD)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=699.
- ↑ Noah Webster (1884) A Practical Dictionary of the English Language
- ↑ 3.0 3.1 "Absolute Magnitude (H)". NASA/JPL. http://neo.jpl.nasa.gov/glossary/h.html.
- ↑ Schmadel, Lutz (2003), Dictionary of minor planet names, 1, Springer, p. 68, ISBN 9783540002383, https://books.google.com/books?id=VoJ5nUyIzCsC&pg=PA68.
- ↑ Angeli, C. A.; Lazzaro, D. (August 2002), "Spectral properties of Mars-crossers and near-Earth objects. Results of the S3OS2 survey", Astronomy and Astrophysics 391: 757–765, doi:10.1051/0004-6361:20020834, Bibcode: 2002A&A...391..757A.
- ↑ Alonso, E. Díez et al. (April 2021), "Asteroids 4092 Tyr (Follow Up, Analysis, Preliminary Results) and 699 Hela (Spin-Shape Model)", Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers 48 (2): 136–139, Bibcode: 2021MPBu...48..136A.
External links
- Lightcurve plot of 699 Hela, Palmer Divide Observatory, B. D. Warner (1999)
- Asteroid Lightcurve Database (LCDB), query form (info )
- 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
- 699 Hela at AstDyS-2, Asteroids—Dynamic Site
- 699 Hela at the JPL Small-Body Database
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