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词条 2044 Wirt
释义

  1. Orbit and classification

  2. Physical characteristics

      Rotation period    Satellite    Diameter and albedo  

  3. Naming

  4. References

  5. External links

{{Infobox planet
| minorplanet = yes
| name = 2044 Wirt
| background = #FA8072
| image =
| image_size =
| caption =
| discovery_ref =  
| discovered = 8 November 1950
| discoverer = C. A. Wirtanen
| discovery_site = Lick Obs.
| mpc_name = (2044) Wirt
| alt_names = 1950 VE
| pronounced =
| named_after = Carl Wirtanen
{{small|(discoverer himself)}}[2]
| mp_category = Mars-crosser[4]{{·}}Phocaea [5][6]
| orbit_ref =  
| epoch = 4 September 2017 (JD 2458000.5)
| uncertainty = 0
| observation_arc = 66.44 yr (24,269 days)
| aphelion = 3.1989 AU
| perihelion = 1.5634 AU
| semimajor = 2.3812 AU
| eccentricity = 0.3434
| period = 3.67 yr (1,342 days)
| mean_anomaly = 53.286°
| mean_motion = {{Deg2DMS|0.2682|sup=ms}} / day
| inclination = 23.970°
| asc_node = 53.646°
| arg_peri = 50.474°
| moid = 0.6559 AU
| satellites = 1 [8][9] {{small|(⌀: 2 km; p: 19.0 h)}}
| dimensions = 6.65 km {{small|(calculated)}}[5]
{{val|6.66|0.6}} km {{small|(IRAS:2)}}[11]
| rotation = {{val|3.6895|0.0003}} h[12]
{{val|3.6898|}} h[13]
{{val|3.6900|0.0003}} h[14]
{{val|3.690|0.00005}} h[8]
| albedo = {{val|0.1907|0.038}} {{small|(IRAS:2)}}[11]
0.23 {{small|(assumed)}}[5]
| spectral_type = S [5]
| abs_magnitude = {{val|12.838|0.002}} {{small|(R)}}[12]{{·}}13.1[5]{{·}}13.3[11]
}}

2044 Wirt, provisional designation {{mp|1950 VE}}, is a binary[9] Phocaea asteroid and Mars-crosser, approximately 6.7 kilometers in diameter. The minor-planet moon has an estimated diameter of 1.89 kilometer.

The asteroid was discovered on 8 November 1950, by American astronomer Carl Wirtanen at Lick Observatory on Mount Hamilton, California, and later named after the discoverer himself.[4]

Orbit and classification

Wirt is both a member of the main-belt's Phocaea family ({{small|701}}) and a Mars-crossing asteroid, whose orbit crosses that of Mars.[4][5][6] It orbits the Sun in the inner main-belt at a distance of 1.6–3.2 AU once every 3 years and 8 months (1,342 days). Its orbit has an eccentricity of 0.34 and an inclination of 24° with respect to the ecliptic.

The asteroid's observation arc begins two weeks after its official discovery with the first recorded observation at Lick Observatory on 22 November 1950.[4]

Physical characteristics

Wirt has been characterized as a stony S-type asteroid.[5]

Rotation period

Between 2005 and 2010, several rotational lightcurve were obtained for this asteroid from photometric observations taken by astronomers Donald Pray, Petr Pravec, Peter Kušnirák, Walter Cooney, Rui Goncalves and Raoul Behrend, as well as at the Palomar Transient Factory. The lightcurves gave a well-defined rotation period between 3.689 and 3.690 hours with a brightness variation between 0.12 and 0.26 magnitude ({{small|U=n.a./3/3/3/3/2}}).[8][9][12][13][14]

Satellite

During the photometric observations in December 2005, a minor-planet moon in orbit of Wirt was discovered. The binary asteroid has diameter ratio of 0.25, and the moon's orbital period is 18.97 hours. It measures approximately 1.89 kilometer in diameter.[8][9][13]

Diameter and albedo

According to the survey carried out by the Infrared Astronomical Satellite IRAS, the asteroid measures 6.66 kilometers in diameter and its surface has an albedo of 0.19,[11] while the Collaborative Asteroid Lightcurve Link assumes an albedo of 0.23 and calculates a diameter of 6.65 kilometers with an absolute magnitude of 13.1.[5]

Naming

It was named after American astronomer Carl Wirtanen (1910–1990), a discoverer of minor planets and comets, who was a long-time contributor of astrometric observations at Lick Observatory. It is one of the rare cases where the asteroid had been named after its discoverer. Wirtanen is known for several surveys conducted at Lick Observatory such as the Lick proper motion program with respect to galaxies and the Shane-Wirtanen survey.[2] The official naming citation was published by the MPC on 1 January 1981 ({{small|M.P.C. 5688}}).[43]

References

1. ^1 2 {{cite book |title = Dictionary of Minor Planet Names – (2044) Wirt |last = Schmadel | first = Lutz D. |publisher = Springer Berlin Heidelberg |page = 166 |date = 2007 |isbn = 978-3-540-00238-3 |doi = 10.1007/978-3-540-29925-7_2045 |chapter = (2044) Wirt }}
2. ^1 2 3 4 {{cite web |title = 2044 Wirt (1950 VE) |work = Minor Planet Center |url = http://www.minorplanetcenter.net/db_search/show_object?object_id=2044 |accessdate = 15 November 2016}}
3. ^1 {{cite web |title = MPC/MPO/MPS Archive |work = Minor Planet Center |url = http://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html |accessdate = 15 November 2016}}
4. ^1 2 {{cite web |title = Asteroids and comets rotation curves – (2044) Wirt |last = Behrend |first = Raoul |publisher = Geneva Observatory |url = http://obswww.unige.ch/~behrend/page4cou.html#002044 |accessdate = 15 November 2016}}
5. ^1 2 3 4 {{cite web |date = 2006-01-06 |title = Electronic Telegram No. 353 |publisher = IAU Central Bureau for Astronomical Telegrams |url = http://www.cbat.eps.harvard.edu/cbet/000300/CBET000353.txt |accessdate = 15 November 2016}}
6. ^1 2 {{cite web |title = Small Bodies Data Ferret |work = Nesvorny HCM Asteroid Families V3.0 |url = https://sbntools.psi.edu/ferret/PropertySearch/familyForm.action |accessdate = 1 November 2017}}
7. ^1 2 3 4 5 6 7 8 {{cite web |title = LCDB Data for (2044) Wirt |publisher = Asteroid Lightcurve Database (LCDB) |url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=2044%7CWirt |accessdate = 15 November 2016}}
8. ^1 2 3 4 {{cite journal |first1 = E. F. |last1 = Tedesco |first2 = P. V. |last2 = Noah |first3 = M. |last3 = Noah |first4 = S. D. |last4 = Price |date = October 2004 |title = IRAS Minor Planet Survey V6.0 |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2004PDSS...12.....T |journal = NASA Planetary Data System |volume = 12 |pages = IRAS-A-FPA-3-RDR-IMPS-V6.0 |bibcode = 2004PDSS...12.....T |access-date= 15 November 2016}}
9. ^1 2 3 {{Cite journal |display-authors = 6 |first1 = D. |last1 = Pray |first2 = P. |last2 = Pravec |first3 = P. |last3 = Kusnirak |first4 = W. |last4 = Cooney |first5 = J. |last5 = Gross |first6 = D. |last6 = Terrell |first7 = A. |last7 = Galad |first8 = S. |last8 = Gajdos |first9 = J. |last9 = Vilagi |first10 = R. |last10 = Durkee |date = January 2006 |title = (2044) Wirt |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2006CBET..353....1P |journal = Central Bureau Electronic Telegrams |volume = 353 |issue = 353 |pages = 1 |bibcode = 2006CBET..353....1P |access-date= 15 November 2016}}
10. ^1 2 3 4 {{Cite journal |display-authors = 6 |first1 = P. |last1 = Pravec |first2 = P. |last2 = Scheirich |first3 = D. |last3 = Vokrouhlický |first4 = A. W. |last4 = Harris |first5 = P. |last5 = Kusnirák |first6 = K. |last6 = Hornoch |first7 = D. P. |last7 = Pray |first8 = D. |last8 = Higgins |first9 = A. |last9 = Galád |first10 = J. |last10 = Világi |first11 = S. |last11 = Gajdos |first12 = L. |last12 = Kornos |first13 = J. |last13 = Oey |first14 = M. |last14 = Husárik |first15 = W. R. |last15 = Cooney |first16 = J. |last16 = Gross |first17 = D. |last17 = Terrell |first18 = R. |last18 = Durkee |first19 = J. |last19 = Pollock |first20 = D. E. |last20 = Reichart |first21 = K. |last21 = Ivarsen |first22 = J. |last22 = Haislip |first23 = A. |last23 = LaCluyze |first24 = Yu. N. |last24 = Krugly |first25 = N. |last25 = Gaftonyuk |first26 = R. D. |last26 = Stephens |first27 = R. |last27 = Dyvig |first28 = V. |last28 = Reddy |first29 = V. |last29 = Chiorny |first30 = O. |last30 = Vaduvescu |last31 = Longa-Peñ |first32 = P. |last32 = a |first33 = A. |last33 = Tudorica |first34 = B. D. |last34 = Warner |first35 = G. |last35 = Masi |first36 = J. |last36 = Brinsfield |last37 = Gonç |first38 = R. |last38 = alves |first39 = P. |last39 = Brown |first40 = Z. |last40 = Krzeminski |first41 = O. |last41 = Gerashchenko |first42 = V. |last42 = Shevchenko |first43 = I. |last43 = Molotov |first44 = F. |last44 = Marchis |date = March 2012 |title = Binary asteroid population. 2. Anisotropic distribution of orbit poles of small, inner main-belt binaries |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012Icar..218..125P |journal = Icarus |volume = 218 |issue = 1 |pages = 125–143 |bibcode = 2012Icar..218..125P |doi = 10.1016/j.icarus.2011.11.026 |access-date= 15 November 2016}}
11. ^1 2 3 {{cite journal |display-authors = 6 |first1 = Adam |last1 = Waszczak |first2 = Chan-Kao |last2 = Chang |first3 = Eran O. |last3 = Ofek |first4 = Russ |last4 = Laher |first5 = Frank |last5 = Masci |first6 = David |last6 = Levitan |first7 = Jason |last7 = Surace |first8 = Yu-Chi |last8 = Cheng |first9 = Wing-Huen |last9 = Ip |first10 = Daisuke |last10 = Kinoshita |first11 = George |last11 = Helou |first12 = Thomas A. |last12 = Prince |first13 = Shrinivas |last13 = Kulkarni |date = September 2015 |title = Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015AJ....150...75W |journal = The Astronomical Journal |volume = 150 |issue = 3 |page = 35 |bibcode = 2015AJ....150...75W |doi = 10.1088/0004-6256/150/3/75 |arxiv = 1504.04041 |access-date= 15 November 2016}}
[1][2][3][4][5][6][7][8][9][10][11]

}}

External links

  • Asteroids with Satellites, Robert Johnston, johnstonsarchive.net
  • Asteroid Lightcurve Database (LCDB), query form (info)
  • [https://books.google.com/books?id=aeAg1X7afOoC&pg Dictionary of Minor Planet Names], Google books
  • Asteroids and comets rotation curves, CdR – Observatoire de Geneve, Raoul Behrend
  • {{JPL small body}}
{{Minor planets navigator|2043 Ortutay|number=2044|2045 Peking}}{{Small Solar System bodies}}{{DEFAULTSORT:Wirt}}

7 : Mars-crossing asteroids|Phocaea asteroids|Discoveries by Carl A. Wirtanen|Minor planets named for people|Named minor planets|Binary asteroids|Astronomical objects discovered in 1950
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