699 Hela
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. This asteroid is orbiting the Sun at a distance of 2.61 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.
Lightcurve-based 3D-model of Hela | |
| Discovery | |
|---|---|
| Discovered by | J. Helffrich |
| Discovery site | Heidelberg |
| Discovery date | 5 June 1910 |
| Designations | |
MPC designation | (699) Hela |
| Pronunciation | /ˈhiːlə/ |
Alternative designations | 1910 KD |
Minor planet category | Mars crosser |
| Orbital characteristics | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 113.38 yr (41,411 d) |
| Aphelion | 3.6831 AU (550.98 Gm) |
| Perihelion | 1.5414 AU (230.59 Gm) |
Semi-major axis | 2.6123 AU (390.79 Gm) |
| Eccentricity | 0.40995 |
Orbital period (sidereal) | 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 |
Synodic rotation period | 3.3962 h (0.14151 d) |
| 11.72 | |
With an absolute magnitude of 11.7, the asteroid is about 12–27 km in diameter. It is classified as a stony Sk or Sq-type 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.
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