335 Roberta

---

title: "335 Roberta" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["background-asteroids", "discoveries-by-anton-staus", "named-minor-planets", "fp-type-asteroids-(tholen)", "b-type-asteroids-(smass)", "astronomical-objects-discovered-in-1892"] description: "Large main belt asteroid" topic_path: "general/background-asteroids" source: "https://en.wikipedia.org/wiki/335_Roberta" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Large main belt asteroid ::

::data[format=table title="Infobox planet"]

Field	Value
minorplanet	yes
background	#D6D6D6
name	335 Roberta
image	335 Roberta.png
caption	Lightcurve-base 3D-model of 335 Roberta.
discoverer	Anton Staus
discovered	1 September 1892
mpc_name	(335) Roberta
alt_names	1892 C
named_after	Carl Robert Osten-Sacken
mp_category	Main belt
orbit_ref
epoch	31 July 2016 (JD 2457600.5)
semimajor	2.47530 AU
perihelion	2.04926 AU
aphelion	2.9014 AU
eccentricity	0.17212
period	3.89 yr (1422.5 d)
inclination	5.1005°
asc_node	148.454°
arg_peri	140.006°
mean_anomaly	355.460°
avg_speed	18.93 km/s
dimensions
rotation	12.054 h
spectral_type	B–V = 0.624
U–B = 0.235
FP (Tholen)
B (SMASS)
abs_magnitude	8.96
albedo
0.058
mean_motion	/ day
observation_arc	123.58 yr (45137 d)
uncertainty	0
moid	1.03587 AU
jupiter_moid	2.2733 AU
tisserand	3.456
::

| minorplanet = yes | background = #D6D6D6 | name = 335 Roberta | image = 335 Roberta.png | caption = Lightcurve-base 3D-model of 335 Roberta. | discoverer = Anton Staus | discovered = 1 September 1892 | mpc_name = (335) Roberta | alt_names = 1892 C | named_after = Carl Robert Osten-Sacken | mp_category = Main belt | orbit_ref = | epoch = 31 July 2016 (JD 2457600.5) | semimajor = 2.47530 AU | perihelion = 2.04926 AU | aphelion = 2.9014 AU | eccentricity = 0.17212 | period = 3.89 yr (1422.5 d) | inclination = 5.1005° | asc_node = 148.454° | arg_peri = 140.006° | mean_anomaly = 355.460° | avg_speed = 18.93 km/s | dimensions = | mass = | density = | surface_grav = | escape_velocity = | rotation = 12.054 h | spectral_type = B–V = 0.624 U–B = 0.235 FP (Tholen) B (SMASS) | abs_magnitude = 8.96 | albedo = 0.058 | single_temperature = | mean_motion = / day | observation_arc = 123.58 yr (45137 d) | uncertainty = 0 | moid = 1.03587 AU | jupiter_moid = 2.2733 AU | tisserand = 3.456

335 Roberta is a large main belt asteroid. It was discovered on 1 September 1892, by German astronomer Anton Staus at Heidelberg Observatory. Roberta was the 12th asteroid that was discovered using photography, and the only asteroid discovery made by Staus.

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.

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.

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. All three asteroids were known to have low-albedo (not reflect as much light) and be close to "meteorite producing resonances". Chrondrites are the most common type of meteor found on Earth, accounting for over 80% of all meteors. They are named for the tiny spherical silicate particles that are found inside them (those particles are called chondrules).

References

|language = de |author = Kutter, A. |date = December 1957 |title = Nachruf auf Anton Staus (Obituary) |url = https://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=1958MitAG...9....5K |journal = Mitteilungen der Astronomischen Gesellschaft |volume = 9 |page = 5 |bibcode = 1958MitAG...9....5K |access-date= 6 July 2016}}

| title = Numbered Minor Planets 1–5000 | work = Discovery Circumstances | publisher = IAU Minor Planet center | url = https://www.minorplanetcenter.net/iau/lists/NumberedMPs000001.html | access-date= 7 April 2013 | postscript= .

| title = 335 Roberta | work = JPL Small-Body Database Browser | publisher = NASA Jet Propulsion Laboratory | url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=335 | access-date= 11 May 2016

| last1=Yang | first1=Bin | last2=Jewitt | first2=David | title=Identification of Magnetite in B-type Asteroids | journal=The Astronomical Journal | volume=140 | issue=3 | pages=692–698 |date=September 2010 | doi=10.1088/0004-6256/140/3/692 | bibcode=2010AJ....140..692Y | arxiv = 1006.5110

| last1 = Warner | first1 = Brian D. | last2 = Roy | first2 = Rene | last3 = Dyvig | first3 = Ron | last4 = Reddy | first4 = Vishnu | last5 = Heathcote | first5 = Bernard | last6 = Behrend | first6 = Raoul | display-authors = 1 | title = Lightcurve Analysis of 335 Roberta | work = The Minor Planet Bulletin | volume = 34 | issue = 4 | page = 99 |date=December 2007 | bibcode = 2007MPBu...34...99W | postscript= .

References

1. [https://books.google.com/books?id=kJDvAAAAMAAJ&q=%22449+Hamburga%22 Lunar and planetary science: abstracts of papers submitted to the ... Lunar and Planetary Science Conference, Volume 27, Part 1 - Lunar and Planetary Institute, Jan 1, 1996]
2. "ASU - Chondrites".

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