![]() Orbital diagram | |
Discovery | |
---|---|
Discovered by | Anton Staus |
Discovery date | 1 September 1892 |
Designations | |
(335) Roberta | |
Named after | Carl Robert Osten-Sacken |
1892 C | |
Main belt | |
Orbital characteristics [1] | |
Epoch 31 July 2016 (JD 2457600.5) | |
Uncertainty parameter 0 | |
Observation arc | 123.58 yr (45137 d) |
Aphelion | 2.9014 AU (434.04 Gm) |
Perihelion | 2.04926 AU (306.565 Gm) |
2.47530 AU (370.300 Gm) | |
Eccentricity | 0.17212 |
3.89 yr (1422.5 d) | |
Average orbital speed | 18.93 km/s |
355.460° | |
0° 15m 11.095s / day | |
Inclination | 5.1005° |
148.454° | |
140.006° | |
Earth MOID | 1.03587 AU (154.964 Gm) |
Jupiter MOID | 2.2733 AU (340.08 Gm) |
TJupiter | 3.456 |
Physical characteristics | |
Dimensions | 89.07±2.0 km [1] |
12.054 h (0.5023 d) | |
0.0580±0.003 [1] 0.058 [2] | |
B–V = 0.624 U–B = 0.235 FP (Tholen) B (SMASS) [1] | |
8.96 [1] | |
335 Roberta is a large main belt asteroid. It was discovered on 1 September 1892, by German astronomer Anton Staus at Heidelberg Observatory. [3] Roberta was the 12th asteroid that was discovered using photography, and the only asteroid discovery made by Staus. [4]
Photometric observations of this asteroid from multiple sites during 2007 gave a light curve with a period of 12.054 ± 0.003 hours and a brightness variation of 0.13 ± 0.02 in magnitude. This agrees with a result reported in 1992, but differs from period estimates of 8.03 hours and 4.349 reported in 1987 and 2001, respectively. [5]
Under the SMASS classification taxonomy, this asteroid is listed as a B-type; a group that combines both the Tholen B and F types. The spectrum of this object suggests the presence of magnetite (Fe3O4), which gives it the spectrally-blue coloration that is a characteristic of this SMASS class. The spectrum of this asteroid also displays a band feature near 2.9 μm that indicate the presence of a hydrated mineral. This suggests that the asteroid has undergone significant water-based alteration. [2]
335 Roberta was identified as one of three asteroids that were likely to be a parent body for chondrites along with 449 Hamburga and 304 Olga. [6] All three asteroids were known to have low-albedo (not reflect as much light) and be close to "meteorite producing resonances". [6] Chrondrites are the most common type of meteor found on Earth, accounting for over 80% of all meteors. [7] They are named for the tiny spherical silicate particles that are found inside them (those particles are called chondrules). [7]