801 Helwerthia is a C-type asteroid orbiting in the Main belt near the Eunomia family. However, it is not a family member but an un-related interloper in the region because its composition is inconsistent with membership. Its diameter is about 33 km, its albedo around 0.038.[2] An international team of astronomers observed this minor planet photometrically in 2012, determining a rotation period of 23.93±0.01 h with an amplitude of 0.15±0.03 in magnitude.[3]
Discovery | |
---|---|
Discovered by | Max Wolf |
Discovery site | Heidelberg Observatory |
Discovery date | 20 March 1915 |
Designations | |
MPC designation | (801) Helwerthia |
Alternative designations | 1915 WQ; A924 OD; 1925 RG; 1970 GS1 |
Orbital characteristics[1] | |
Epoch 31 July 2016 (JD 2457600.5) | |
Uncertainty parameter 0 | |
Observation arc | 101.08 yr (36918 d) |
Aphelion | 2.8087 AU (420.18 Gm) |
Perihelion | 2.4007 AU (359.14 Gm) |
Semi-major axis | 2.6047 AU (389.66 Gm) |
Eccentricity | 0.078337 |
Orbital period (sidereal) | 4.20 yr (1535.4 d) |
Mean anomaly | 47.6362° |
Mean motion | 0° 14m 4.056s / day |
Inclination | 14.130° |
Longitude of ascending node | 185.973° |
Argument of perihelion | 335.076° |
Earth MOID | 1.41172 AU (211.190 Gm) |
Jupiter MOID | 2.17333 AU (325.126 Gm) |
TJupiter | 3.366 |
Physical characteristics | |
Mean radius | 16.615±1.25 km |
Synodic rotation period | 23.93 h (0.997 d) |
Geometric albedo | 0.0384±0.007 |
Absolute magnitude (H) | 11.55 |
| |
---|---|
|
Small Solar System bodies | |||||||
---|---|---|---|---|---|---|---|
Minor planets |
| ||||||
Comets |
| ||||||
Other |
|
![]() | This article about a C-type asteroid native to the asteroid belt is a stub. You can help Wikipedia by expanding it. |