| 词条 | 4391 Balodis |
| 释义 |
| minorplanet = yes | name = 4391 Balodis | background = #D6D6D6 | image = | image_size = | caption = | discovery_ref = | discovered = 21 August 1977 | discoverer = N. Chernykh | discovery_site = {{nowrap|Crimean Astrophysical Obs.}} | mpc_name = (4391) Balodis | alt_names = {{mp|1977 QW|2}}{{·}}{{mp|1977 RR|2}} 1980 GZ | named_after = Jānis Balodis {{small|(Latvian cosmic geodesist)}}[2] | mp_category = main-belt{{·}}Erigone [3] | orbit_ref = | epoch = 4 September 2017 (JD 2458000.5) | uncertainty = 0 | observation_arc = 39.70 yr (14,499 days) | aphelion = 2.8989 AU | perihelion = 1.8794 AU | semimajor = 2.3892 AU | eccentricity = 0.2134 | period = 3.69 yr (1,349 days) | mean_anomaly = 330.57° | mean_motion = {{Deg2DMS|0.2669|sup=ms}} / day | inclination = 5.3519° | asc_node = 190.30° | arg_peri = 108.27° | dimensions = {{val|3.36|0.17}} km[5] 8.05 km {{small|(calculated)}}[3] | rotation = {{val|3.448|0.001}} h[7] | albedo = 0.057 {{small|(assumed)}}[3] {{val|0.393|0.072}}[5] | spectral_type = C [3] | abs_magnitude = 14.2[3]{{·}}14.00[5]{{·}}{{val|14.37|0.36}}[14] }}4391 Balodis, provisional designation {{mp|1977 QW|2}}, is a dark and rare Erigone asteroid from the inner regions of the asteroid belt, approximately 8 kilometers in diameter. It was discovered by Soviet–Russian astronomer Nikolai Chernykh at the Crimean Astrophysical Observatory in Nauchnyj, on the Crimean peninsula, on 21 August 1977.[15] The asteroid was named for Latvian geodesist Jānis Balodis.[2] Orbit and classificationBalodis orbits the Sun in the inner main-belt at a distance of 1.9–2.9 AU once every 3 years and 8 months (1,349 days). Its orbit has an eccentricity of 0.21 and an inclination of 5° with respect to the ecliptic. Based on its orbital elements, the Collaborative Asteroid Lightcurve Link (CALL) classifies the asteroid as a member of the Erigone family, which is named after its largest member and namesake, 163 Erigone, also a dark body of carbonaceous composition.[3]Physical characteristicsDiameter and albedoAccording to observations by NASA's space-based Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Balodis measures 3.4 kilometers in diameter, and its surface has an exceptionally high albedo of 0.40.[5] However, the CALL assumes a standard albedo for a C-type asteroid of 0.057 and calculates a diameter of 8.4 kilometers with an absolute magnitude of 14.2, as the lower the albedo (reflectivity) the larger the body's diameter.[3] Rotation periodIn July 2010, a rotational lightcurve of Balodis was obtained by Italian astronomer Albino Carbognani from photometric observations taken at the Astronomical Observatory of the Autonomous Region of the Aosta Valley (OAVdA) in Italy. It showed rotation period of {{val|3.448|0.001}} hours with a brightness amplitude of 0.29 in magnitude ({{small|U=2}}).[7] NamingThis minor planet was named after Latvian cosmic geodesist Jānis Balodis, head of the Astronomical Observatory at University of Latvia.[2] Balodis{{'}} research includes astrometry, observations of artificial satellites using laser, as well as computational methods for astrometric interpretations of photographic plates. The Crimean minor planet service has used his algorithms for a long time.[2] (The honored astronomer should not to be confused with Soviet army General Jānis Balodis.) The official naming citation was published by the Minor Planet Center on 12 September 1992 ({{small|M.P.C. 20837}}).[24] References1. ^1 2 3 4 {{cite book |title = Dictionary of Minor Planet Names – (4391) Balodis |last = Schmadel | first = Lutz D. |publisher = Springer Berlin Heidelberg |page = 377 |date = 2007 |isbn = 978-3-540-00238-3 |doi = 10.1007/978-3-540-29925-7_4341 |chapter = (4391) Balodis }} [1][2][3][4][5][6][7]2. ^1 {{cite web |title = 4391 Balodis (1977 QW2) |work = Minor Planet Center |url = http://www.minorplanetcenter.net/db_search/show_object?object_id=4391 |accessdate = 2 May 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 = 2 May 2016}} 4. ^1 2 3 4 5 6 7 {{cite web |title = LCDB Data for (4391) Balodis |publisher = Asteroid Lightcurve Database (LCDB) |url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=4391%7CBalodis |accessdate = 2 May 2016}} 5. ^1 2 3 4 {{cite journal |display-authors = 6 |first1 = Joseph R. |last1 = Masiero |first2 = A. K. |last2 = Mainzer |first3 = T. |last3 = Grav |first4 = J. M. |last4 = Bauer |first5 = R. M. |last5 = Cutri |first6 = C. |last6 = Nugent |first7 = M. S. |last7 = Cabrera |date = November 2012 |title = Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012ApJ...759L...8M |journal = The Astrophysical Journal Letters |volume = 759 |issue = 1 |page = 5 |bibcode = 2012ApJ...759L...8M |doi = 10.1088/2041-8205/759/1/L8 |arxiv = 1209.5794 |access-date= 2 May 2016}} 6. ^1 2 {{Cite journal |author = Carbognani, Albino |date = January 2011 |title = Lightcurves and Periods of Eighteen NEAs and MBAs |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011MPBu...38...57C |journal = The Minor Planet Bulletin |volume = 38 |issue = 1 |pages = 57–63 |issn = 1052-8091 |bibcode = 2011MPBu...38...57C |access-date= 2 May 2016}} 7. ^1 {{cite journal |display-authors = 6 |first1 = Peter |last1 = Veres |first2 = Robert |last2 = Jedicke |first3 = Alan |last3 = Fitzsimmons |first4 = Larry |last4 = Denneau |first5 = Mikael |last5 = Granvik |first6 = Bryce |last6 = Bolin |first7 = Serge |last7 = Chastel |first8 = Richard J. |last8 = Wainscoat |first9 = William S. |last9 = Burgett |first10 = Kenneth C. |last10 = Chambers |first11 = Heather |last11 = Flewelling |first12 = Nick |last12 = Kaiser |first13 = Eugen A. |last13 = Magnier |first14 = Jeff S. |last14 = Morgan |first15 = Paul A. |last15 = Price |first16 = John L. |last16 = Tonry |first17 = Christopher |last17 = Waters |date = November 2015 |title = Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V |journal = Icarus |volume = 261 |pages = 34–47 |bibcode = 2015Icar..261...34V |doi = 10.1016/j.icarus.2015.08.007 |arxiv = 1506.00762 |access-date= 2 May 2016}} }} External links
5 : Background asteroids|Discoveries by Nikolai Chernykh|Minor planets named for people|Named minor planets|Astronomical objects discovered in 1977 |
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