词条 | 1928 Summa |
释义 |
| minorplanet = yes | name = 1928 Summa | background = #D6D6D6 | image = | image_size = | caption = | discovery_ref = | discovered = 21 September 1938 | discoverer = Y. Väisälä | discovery_site = Turku Obs. | mpc_name = (1928) Summa | alt_names = 1938 SO{{·}}1969 PA | pronounced = | named_after = Finnish village {{small|(Battle of Summa)}}[2] | mp_category = main-belt{{·}}{{small|(inner)}} [3] | orbit_ref = | epoch = 4 September 2017 (JD 2458000.5) | uncertainty = 0 | observation_arc = 78.38 yr (28,628 days) | aphelion = 2.9797 AU | perihelion = 1.9733 AU | semimajor = 2.4765 AU | eccentricity = 0.2032 | period = 3.90 yr (1,423 days) | mean_anomaly = 98.003° | mean_motion = {{Deg2DMS|0.2529|sup=ms}} / day | inclination = 4.5756° | asc_node = 180.42° | arg_peri = 157.80° | dimensions = 8.34 km {{small|(derived)}}[3] {{val|9.333|0.170}} km[6][7] | rotation = {{val|6.8549|0.0006}} h[8] {{val|6.855|0.001}} h[9] {{val|9.66}} h {{small|(dated)}}[10] | albedo = {{val|0.160|0.043}}[6][7] 0.20 {{small|(assumed)}}[3] | spectral_type = S [3][10] B–V = 1.010 | abs_magnitude = 12.68{{·}}12.76[3][6][10]{{·}}{{val|13.20|0.85}}[21] }} 1928 Summa, provisional designation {{mp|1938 SO}}, is a stony asteroid from the inner regions of the asteroid belt, approximately 9 kilometers in diameter. It was discovered on 21 September 1938, by Finnish astronomer Yrjö Väisälä at Turku Observatory in Southwest Finland.[22] It was named for a Finnish village where the Battle of Summa took place.[2] Orbit and classificationSumma is a S-type asteroid that orbits the Sun in the inner main-belt at a distance of 2.0–3.0 AU once every 3 years and 11 months (1,423 days). Its orbit has an eccentricity of 0.20 and an inclination of 5° with respect to the ecliptic. The body's observation arc begins at Turku one night after its official discovery observation, with no precoveries taken, and no prior identifications made.[22]Rotation periodIn March 1984, the first but poorly rated rotational lightcurve of Summa was obtained from photometric observations by American astronomer Richard Binzel. It gave a rotation period of 9.66 hours with a brightness amplitude of 0.14 magnitude ({{small|U=1}}).[10] In August 2012, a refined yet ambiguous lightcurve with a period of 6.855 hours and an amplitude of 0.13 was obtained by Larry E. Owings at the Barnes Ridge Observatory in California ({{small|U=2+}}). Lightcurve analysis also considered that Summa might be a binary system.[9] One month later, the so-far best rated lightcurve from British astronomer Kevin Hills using the remote controlled Riverland Dingo Observatory in Australia, gave a period of 6.8549 hours with a brightness amplitude of 0.18 ({{small|U=3}}).[8] Diameter an albedoAccording to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Summa measures 9.333 kilometers in diameter and its surface has an albedo of 0.160,[6][7] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 8.34 kilometers with an absolute magnitude of 12.76.[3] NamingThis minor planet was named after the village on the Karelian Isthmus, where the Battle of Summa took place during the Finnish Winter War (1939–1940).[2] The approved naming citation was published by the Minor Planet Center on 1 August 1980 ({{small|M.P.C. 5450}}).[33] Most of Yrjö Väisälä's discoveries have names that relate in one way or another to this military conflict between Finland and the Soviet Union during World War II. References1. ^1 2 3 {{cite book |title = Dictionary of Minor Planet Names – (1928) Summa |last = Schmadel | first = Lutz D. |publisher = Springer Berlin Heidelberg |page = 155 |date = 2007 |isbn = 978-3-540-00238-3 |doi = 10.1007/978-3-540-29925-7_1929 |chapter = (1928) Summa }} [1][2][3][4][5][6][7][8][9][10]2. ^1 2 {{cite web |title = 1928 Summa (1938 SO) |work = Minor Planet Center |url = http://www.minorplanetcenter.net/db_search/show_object?object_id=1928 |accessdate = 5 April 2017}} 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 = 5 April 2017}} 4. ^1 2 3 {{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 = J. |last6 = Dailey |first7 = P. R. M. |last7 = Eisenhardt |first8 = R. S. |last8 = McMillan |first9 = T. B. |last9 = Spahr |first10 = M. F. |last10 = Skrutskie |first11 = D. |last11 = Tholen |first12 = R. G. |last12 = Walker |first13 = E. L. |last13 = Wright |first14 = E. |last14 = DeBaun |first15 = D. |last15 = Elsbury |first16 = T., IV |last16 = Gautier |first17 = S. |last17 = Gomillion |first18 = A. |last18 = Wilkins |date = November 2011 |title = Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...68M |journal = The Astrophysical Journal |volume = 741 |issue = 2 |page = 20 |bibcode = 2011ApJ...741...68M |doi = 10.1088/0004-637X/741/2/68 |arxiv = 1109.4096 |access-date= 5 April 2017}} 5. ^1 2 3 4 5 6 {{cite web |title = LCDB Data for (1928) Summa |publisher = Asteroid Lightcurve Database (LCDB) |url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=1928%7CSumma |accessdate = 5 April 2017}} 6. ^1 2 3 4 {{cite journal |display-authors = 6 |first1 = A. |last1 = Mainzer |first2 = T. |last2 = Grav |first3 = J. |last3 = Masiero |first4 = E. |last4 = Hand |first5 = J. |last5 = Bauer |first6 = D. |last6 = Tholen |first7 = R. S. |last7 = McMillan |first8 = T. |last8 = Spahr |first9 = R. M. |last9 = Cutri |first10 = E. |last10 = Wright |first11 = J. |last11 = Watkins |first12 = W. |last12 = Mo |first13 = C. |last13 = Maleszewski |date = November 2011 |title = NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results |journal = The Astrophysical Journal |volume = 741 |issue = 2 |page = 25 |bibcode = 2011ApJ...741...90M |doi = 10.1088/0004-637X/741/2/90 |arxiv = 1109.6407 }} 7. ^1 2 3 4 {{Cite journal |author = Binzel, R. P. |date = October 1987 |title = A photoelectric survey of 130 asteroids |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=1987Icar...72..135B |journal = Icarus |volume = 72 |issue = 1 |pages = 135–208 |issn = 0019-1035 |bibcode = 1987Icar...72..135B |doi = 10.1016/0019-1035(87)90125-4 |access-date= 5 April 2017}} 8. ^1 2 {{Cite journal |author = Hills, Kevin |date = January 2013 |title = Asteroid Lightcurve Analysis at Riverland Dingo Observatory (RDO): 501 Urhixidur, 1897 Hind, 1928 Summa, 6261 Chione, and (68216) 2001 CV 26. |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2013MPBu...40...12H |journal = The Minor Planet Bulletin |volume = 40 |issue = 1 |pages = 12–13 |issn = 1052-8091 |bibcode = 2013MPBu...40...12H |access-date= 5 April 2017}} 9. ^1 2 {{Cite journal |author = Owings, Larry E. |date = April 2013 |title = Lightcurves for 1560 Strattonia, 1928 Summa, 2763 Jeans, 3478 Fanale, 3948 Bohr, 5275 Zdislava, and 5369 Virgiugum |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2013MPBu...40..104O |journal = The Minor Planet Bulletin |volume = 40 |issue = 2 |pages = 104–106 |issn = 1052-8091 |bibcode = 2013MPBu...40..104O |access-date= 5 April 2017}} 10. ^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= 5 April 2017}} }} External links
5 : Background asteroids|Discoveries by Yrjö Väisälä|Minor planets named for places|Named minor planets|Astronomical objects discovered in 1938 |
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