| 词条 | 335 Roberta |
| 释义 |
| minorplanet=yes | background=#D6D6D6 | name=335 Roberta | discoverer=Anton Staus | discovered=1 September 1892 | mpc_name=(335) Roberta | alt_names=1892 C | named_after=Karl Robert Osten-Sacken | mp_category=Main belt | orbit_ref=[1] | epoch=31 July 2016 (JD 2457600.5) | semimajor={{Convert|2.47530|AU|Gm|abbr=on}} | perihelion={{Convert|2.04926|AU|Gm|abbr=on}} | aphelion={{Convert|2.9014|AU|Gm|abbr=on|lk=on}} | 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={{val|89.07|2.0|ul=km}}[1] | mass= | density= | surface_grav= | escape_velocity= | rotation={{Convert|12.054|h|d|abbr=on|lk=on}} | spectral_type = B–V = 0.624 U–B = 0.235 FP {{small|(Tholen)}} B {{small|(SMASS)}}[1] | abs_magnitude=8.96[1] | albedo={{val|0.0580|0.003}}[1] 0.058[6] | single_temperature= | mean_motion={{Deg2DMS|0.253082|sup=ms}} / day | observation_arc=123.58 yr (45137 d) | uncertainty=0 | moid={{Convert|1.03587|AU|Gm|abbr=on}} | jupiter_moid={{Convert|2.2733|AU|Gm|abbr=on}} | tisserand=3.456 }}Roberta (minor planet designation: 335 Roberta) is a large main belt asteroid. It was discovered on 1 September 1892, by German astronomer Anton Staus at Heidelberg Observatory.[7] 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.[9] 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.[6] 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.[1] All three asteroids were known to have low-albedo (not reflect as much light) and be close to "meteorite producing resonances".[1] Chrondrites are the most common type of meteor found on Earth, accounting for over 80% of all meteors.[2] They are named for the tiny spherical silicate particles that are found inside them (those particles are called chondrules).[2] References1. ^1 [https://books.google.com/books?id=kJDvAAAAMAAJ&q=%22449+Hamburga%22&dq=%22449+Hamburga%22&hl=en&sa=X&ved=0CBwQ6AEwADgeahUKEwiz86-8xNPHAhUEj4AKHdbtB-E 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] [3][4][5][6]2. ^1 [https://meteorites.asu.edu/meteorites/meteorite-types/stony-meteorites/chondrites ASU - Chondrites] 3. ^1 {{Citation | title = Numbered Minor Planets 1–5000 | work = Discovery Circumstances | publisher = IAU Minor Planet center | url = http://www.minorplanetcenter.net/iau/lists/NumberedMPs000001.html | accessdate= 7 April 2013 | postscript= .}} 4. ^1 2 3 4 5 {{Citation | title = 335 Roberta | work = JPL Small-Body Database Browser | publisher = NASA Jet Propulsion Laboratory | url = http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=335 | accessdate= 11 May 2016}} 5. ^1 2 {{citation | 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}} 6. ^1 {{Citation | 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= .}} }} External links
7 : Background asteroids|Discoveries by Anton Staus|Minor planets named for people|Named minor planets|FP-type asteroids (Tholen)|B-type asteroids (SMASS)|Astronomical objects discovered in 1892 |
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