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{{Short description|Large main belt asteroid}}
{{Refimprove|date=December 2009}}
{{Use dmy dates|date=October 2019}}
{{Infobox planet
{{Infobox planet
| minorplanet=yes
|width = 25em
|background = #FFFFC0 | name=335 Roberta
| background=#D6D6D6
| name=335 Roberta
|image= Орбита астероида 335.png
|caption=Orbital diagram
| discoverer=[[Anton Staus]]
| discoverer=[[Anton Staus]]
| discovered=September 1, 1892
| discovered=1 September 1892
| mpc_name=(335) Roberta
| alt_names=1892 C
| alt_names=1892 C
| named_after = [[Karl Robert Osten-Sacken]]
| named_after=[[Carl Robert Osten-Sacken]]
| mp_category=[[Asteroid belt|Main belt]]
| mp_category=[[Asteroid belt|Main belt]]
| orbit_ref=<ref name=jpldata/>
| epoch=30 January 2005 ([[Julian day|JD]] 2453400.5)
| semimajor=370.178 Gm (2.474 [[Astronomical unit|AU]])
| epoch=31 July 2016 ([[Julian day|JD]] 2457600.5)
| semimajor={{Convert|2.47530|AU|Gm|abbr=on}}
| perihelion=305.856 Gm (2.045 AU)
| perihelion={{Convert|2.04926|AU|Gm|abbr=on}}
| aphelion=434.501 Gm (2.904 AU)
| aphelion={{Convert|2.9014|AU|Gm|abbr=on|lk=on}}
| eccentricity=0.174
| eccentricity=0.17212
| period=1421.736 d (3.89 [[Julian year (astronomy)|a]])
| period=3.89 [[Julian year (astronomy)|yr]] (1422.5 [[Julian year (astronomy)|d]])
| inclination=5.093°
| asc_node=148.541°
| inclination=5.1005°
| arg_peri=139.567°
| asc_node=148.454°
| mean_anomaly=12.696°
| arg_peri=140.006°
| mean_anomaly=355.460[[Degree (angle)|°]]
| avg_speed=18.93 km/s
| avg_speed=18.93 km/s
| dimensions=89.0 km
| dimensions={{val|89.07|2.0|ul=km}}<ref name=jpldata/>
| mass=''unknown''
| mass=
| density=''unknown''
| density=
| surface_grav=''unknown''
| surface_grav=
| escape_velocity=''unknown''
| escape_velocity=
| rotation=''unknown''
| rotation={{Convert|12.054|h|d|abbr=on|lk=on}}
| spectral_type = [[Asteroid color indices|B–V]] = 0.624<br />[[Asteroid color indices|U–B]] = 0.235<br />[[F-type asteroid|FP]] {{small|([[Tholen classification|Tholen]])}}<br />[[B-type asteroid|B]] {{small|([[SMASS classification|SMASS]])}}<ref name=jpldata/>
| spectral_type=[[F-type asteroid|F]]
| abs_magnitude=8.96
| abs_magnitude=8.96<ref name=jpldata/>
| albedo=0.058<ref name=aj140_3_692/>
| albedo={{val|0.0580|0.003}}<ref name=jpldata/><br />0.058<ref name=aj140_3_692/>
| single_temperature=''unknown''}}
| 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
}}


'''335 Roberta''' is a large [[Asteroid belt|Main belt]] [[asteroid]]. It is classified as an [[F-type asteroid]]. It was discovered by [[Anton Staus]] on September 1, 1892 in [[Heidelberg]]. It was his only asteroid discovery.
'''335 Roberta''' is a large [[Asteroid belt|main belt]] [[asteroid]]. It was discovered on 1 September 1892, by German astronomer [[Anton Staus]] at [[Heidelberg Observatory]].<ref name="IAU_MPC"/> ''Roberta'' was the 12th asteroid that was discovered using photography, and the only asteroid discovery made by Staus.<ref name="Obituary" />


[[Photometry (astronomy)|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 (astronomy)|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.<ref name="Warner2007"/>
Under the [[SMASS classification]] taxonomy, Polana is listed as a B-type asteroid; a group that combines both the Tholen B and F types. The spectrum of this object suggests the presence of [[magnetite]] (Fe<sub>3</sub>O<sub>4</sub>), 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&nbsp;μm that indicate the presence of a hydrated mineral. This suggests that the asteroid has undergone significant water-based alteration.<ref name=aj140_3_692/>

Under the [[SMASS classification]] taxonomy, this asteroid is listed as a [[B-type asteroid|B-type]]; a group that combines both the Tholen B and F types. The spectrum of this object suggests the presence of [[magnetite]] (Fe<sub>3</sub>O<sub>4</sub>), 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&nbsp;μm that indicate the presence of a hydrated mineral. This suggests that the asteroid has undergone significant water-based alteration.<ref name=aj140_3_692/>

335 Roberta was identified as one of three asteroids that were likely to be a parent body for [[chondrite]]s along with [[449 Hamburga]] and [[304 Olga]].<ref name="books.google.com">[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]</ref> All three asteroids were known to have low-albedo (not reflect as much light) and be close to "meteorite producing resonances".<ref name="books.google.com"/> Chrondrites are the most common type of meteor found on Earth, accounting for over 80% of all meteors.<ref name="ASU - Chondrites">{{Cite web |url=https://meteorites.asu.edu/meteorites/meteorite-types/stony-meteorites/chondrites |title=ASU - Chondrites |access-date=31 August 2015 |archive-date=22 June 2019 |archive-url=https://web.archive.org/web/20190622023849/https://meteorites.asu.edu/meteorites/meteorite-types/stony-meteorites/chondrites |url-status=dead }}</ref> They are named for the tiny spherical silicate particles that are found inside them (those particles are called chondrules).<ref name="ASU - Chondrites"/>


==References==
==References==
{{reflist|refs=
{{reflist|refs=


<ref name="Obituary">{{Cite journal
<ref name=aj140_3_692>{{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 | month=September | year=2010 | doi=10.1088/0004-6256/140/3/692 | bibcode=2010AJ....140..692Y |arxiv = 1006.5110 }}</ref>
|language = de
|author = Kutter, A.
|date = December 1957
|title = Nachruf auf Anton Staus (Obituary)
|url = http://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}}</ref>


<ref name="IAU_MPC">{{Citation
}}
| 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= .
}}</ref>


<ref name=jpldata>{{Citation
{{Minor planets navigator|334 Chicago|336 Lacadiera}}
| title = 335 Roberta
{{Small Solar System bodies}}
| 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
}}</ref>


<ref name=aj140_3_692>{{citation
{{DEFAULTSORT:Roberta}}
| last1=Yang
[[Category:Main Belt asteroids]]
| first1=Bin
[[Category:F-type asteroids]]
| last2=Jewitt
[[Category:Asteroids named for people]]
| first2=David
[[Category:Astronomical objects discovered in 1892]]
| 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
}}</ref>


<ref name="Warner2007">{{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= .
}}</ref>


}} <!-- end of reflist -->
{{Beltasteroid-stub}}


== External links ==
[[de:(335) Roberta]]
* [http://www.minorplanetobserver.com/pdolc/A335_2007.HTM Lightcurve plot of 335 Roberta], Palmer Divide Observatory, [[Brian D. Warner|B. D. Warner]] (2007)
[[el:335 Ροβέρτα]]
* [http://www.minorplanet.info/PHP/lcdbsummaryquery.php Asteroid Lightcurve Database (LCDB)], query form ([http://www.minorplanet.info/lightcurvedatabase.html info] {{Webarchive|url=https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html |date=16 December 2017 }})
[[es:(335) Roberta]]
* [https://books.google.com/books?id=aeAg1X7afOoC Dictionary of Minor Planet Names], Google books
[[eo:335 Roberto]]
* [http://obswww.unige.ch/~behrend/page_cou.html Asteroids and comets rotation curves, CdR] – Observatoire de Genève, Raoul Behrend
[[eu:335 Roberta]]
* [https://www.minorplanetcenter.net/iau/lists/NumberedMPs000001.html Discovery Circumstances: Numbered Minor Planets (1)-(5000)] – Minor Planet Center
[[fa:سیارک ۳۳۵]]
* {{AstDys|335}}
[[fr:(335) Roberta]]
* {{JPL small body}}
[[it:335 Roberta]]

[[la:335 Roberta]]
{{Minor planets navigator |334 Chicago |number=335 |336 Lacadiera}}
[[hu:335 Roberta]]
{{Small Solar System bodies}}
[[ja:ロベルタ (小惑星)]]
{{Authority control}}
[[no:335 Roberta]]

[[nn:335 Roberta]]
[[pl:335 Roberta]]
{{DEFAULTSORT:Roberta}}
[[Category:Background asteroids|000335]]
[[pt:335 Roberta]]
[[Category:Discoveries by Anton Staus]]
[[ru:(335) Роберта]]
[[Category:Named minor planets]]
[[sk:335 Roberta]]
[[Category:FP-type asteroids (Tholen)|000335]]
[[sl:335 Roberta]]
[[Category:B-type asteroids (SMASS)|000335]]
[[sr:335 Роберта]]
[[Category:Astronomical objects discovered in 1892|18920901]]
[[tl:335 Roberta]]
[[uk:335 Роберта]]
[[vi:335 Roberta]]
[[yo:335 Roberta]]
[[zh:小行星335]]

Latest revision as of 09:21, 2 August 2024

335 Roberta
Orbital diagram
Discovery
Discovered byAnton Staus
Discovery date1 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 arc123.58 yr (45137 d)
Aphelion2.9014 AU (434.04 Gm)
Perihelion2.04926 AU (306.565 Gm)
2.47530 AU (370.300 Gm)
Eccentricity0.17212
3.89 yr (1422.5 d)
18.93 km/s
355.460°
0° 15m 11.095s / day
Inclination5.1005°
148.454°
140.006°
Earth MOID1.03587 AU (154.964 Gm)
Jupiter MOID2.2733 AU (340.08 Gm)
TJupiter3.456
Physical characteristics
Dimensions89.07±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]

References

[edit]
  1. ^ a b c d e "335 Roberta", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 11 May 2016
  2. ^ a b Yang, Bin; Jewitt, David (September 2010), "Identification of Magnetite in B-type Asteroids", The Astronomical Journal, 140 (3): 692–698, arXiv:1006.5110, Bibcode:2010AJ....140..692Y, doi:10.1088/0004-6256/140/3/692
  3. ^ "Numbered Minor Planets 1–5000", Discovery Circumstances, IAU Minor Planet center, retrieved 7 April 2013.
  4. ^ Kutter, A. (December 1957). "Nachruf auf Anton Staus (Obituary)". Mitteilungen der Astronomischen Gesellschaft (in German). 9: 5. Bibcode:1958MitAG...9....5K. Retrieved 6 July 2016.
  5. ^ Warner, Brian D.; et al. (December 2007), "Lightcurve Analysis of 335 Roberta", The Minor Planet Bulletin, vol. 34, no. 4, p. 99, Bibcode:2007MPBu...34...99W.
  6. ^ a b 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
  7. ^ a b "ASU - Chondrites". Archived from the original on 22 June 2019. Retrieved 31 August 2015.
[edit]
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