“950 Ahrensa”的意思、由来-开放百科全书

The S-type asteroid, classified as a Sa-subtype in the SMASS taxonomic scheme, is a member of the Phocaea family, a group of asteroids with similar orbital characteristics. It orbits the Sun at a distance of 2.0–2.7 AU once every 3 years and 8 months (1,334 days). Its orbit shows an eccentricity of 0.16 and is tilted by 23 degrees to the plane of the ecliptic.

A photometric lightcurve analysis at the U.S. Palmer Divide Observatory in 2009, showed that the body has an exceptionally long rotation period of 202 hours.^[10] According to the surveys carried out by the Infrared Astronomical Satellite, IRAS, the Japanese Akari satellite, and the U.S. Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the surface of the asteroid has an albedo in the range of 0.16 to 0.23, while the Collaborative Asteroid Lightcurve Link derives an even higher value of 0.27 for the stony body.^[5]^[6]^[7]^[8]

The minor planet was named in honor of friends of the discoverer Karl Reinmuth, the Ahrens family, who helped him financially at the Heidelberg Observatory. Reinmuth also named the minor planet 909 Ulla after Ulla Ahrens, a member of this family.^[2]

References

1. ^¹²³⁴⁵{{cite web |type=2015-10-30 last obs. |title=JPL Small-Body Database Browser: 950 Ahrensa (1921 JP) |url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2000950 |publisher=Jet Propulsion Laboratory |accessdate=2 May 2016}}
2. ^¹²{{cite book |title=Dictionary of Minor Planet Names – (950) Ahrensa |last=Schmadel |first=Lutz D. |publisher=Springer Berlin Heidelberg |page=84 |date=2003 |isbn=978-3-540-29925-7 |doi=10.1007/978-3-540-29925-7_951 |chapter = (950) Ahrensa}}
3. ^¹{{cite web |title=950 Ahrensa (1921 JP) |work=Minor Planet Center |url=http://www.minorplanetcenter.net/db_search/show_object?object_id=950 |accessdate=4 January 2016}}
4. ^¹²³{{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= 4 January 2016}}
5. ^¹²³{{cite journal |display-authors = 6 |first1 = Fumihiko |last1 = Usui |first2 = Daisuke |last2 = Kuroda |first3 = Thomas G. |last3 = Müller |first4 = Sunao |last4 = Hasegawa |first5 = Masateru |last5 = Ishiguro |first6 = Takafumi |last6 = Ootsubo |first7 = Daisuke |last7 = Ishihara |first8 = Hirokazu |last8 = Kataza |first9 = Satoshi |last9 = Takita |first10 = Shinki |last10 = Oyabu |first11 = Munetaka |last11 = Ueno |first12 = Hideo |last12 = Matsuhara |first13 = Takashi |last13 = Onaka |date = October 2011 |title = Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011PASJ...63.1117U |journal = Publications of the Astronomical Society of Japan |volume = 63 |issue = 5 |pages = 1117–1138 |bibcode = 2011PASJ...63.1117U |doi = 10.1093/pasj/63.5.1117 |access-date= 4 January 2016}}
6. ^¹²³{{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 |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...90M |journal = The Astrophysical Journal |volume = 741 |issue = 2 |page = 25 |bibcode = 2011ApJ...741...90M |doi = 10.1088/0004-637X/741/2/90 |access-date= 4 January 2016|arxiv = 1109.6407 }}
7. ^¹²³{{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 |access-date= 4 January 2016|arxiv = 1209.5794 }}
8. ^¹²{{cite journal |author = Warner, Brian D. |date = January 2010 |title = Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2009 June-September |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2010MPBu...37...24W |journal = The Minor Planet Bulletin |volume = 37 |issue = 1 |pages = 24–27 |issn = 1052-8091 |bibcode = 2010MPBu...37...24W |access-date= 4 January 2016}}

词条	950 Ahrensa
释义	Description References External links {{Infobox planet \| minorplanet = yes \| name = 950 Ahrensa \| background = #D6D6D6 \| image = \| caption = \| discovery_ref = ^[1] \| discovered = 1 April 1921 \| discoverer = K. Reinmuth \| discovery_site = Heidelberg Obs. \| mpc_name = (950) Ahrensa \| alt_names = 1921 JP{{·}}{{mp\|1955 SU\|2}} {{mp\|1974 VG\|3}}{{·}}A904 RF \| named_after = Ahrens family {{small\|(friends of discoverer)}}^[2] \| mp_category = main-belt{{·}}Phocaea \| orbit_ref = ^[1] \| epoch = 31 July 2016 (JD 2457600.5) \| uncertainty = 0 \| observation_arc = 111.60 yr (40761 days) \| aphelion = {{Convert\|2.7477\|AU\|Gm\|abbr=on\|lk=on}} \| perihelion = {{Convert\|1.9958\|AU\|Gm\|abbr=on}} \| semimajor = {{Convert\|2.3717\|AU\|Gm\|abbr=on}} \| eccentricity = 0.15851 \| period = 3.65 yr (1334.1 d) \| mean_anomaly = 53.005° \| mean_motion = {{Deg2DMS\|0.26984\|sup=ms}} / day \| inclination = 23.477° \| asc_node = 181.81° \| arg_peri = 348.19° \| mean_diameter = {{val\|15.03\|1.8}} {{small\|(IRAS:15)}} km^[5] {{val\|16.21\|0.53}} km^[6] {{val\|14.299\|0.070}} km^[7] {{val\|16.66\|0.41}} km^[8] 15.34 km {{small\|(derived)}} \| rotation = {{val\|202\|1}} h,^[10] {{Convert\|202\|h\|d\|abbr=on\|lk=on}}^[1] \| albedo = {{val\|0.1793\|0.054}} {{small\|(IRAS:15)}}^[1]^[5] {{val\|0.158\|0.011}}^[6] {{val\|0.1988\|0.0203}}^[7] {{val\|0.231\|0.031}}^[8] 0.2727 {{small\|(derived)}} \| spectral_type = SMASS = Sa S \| abs_magnitude = 11.2^[1] }}950 Ahrensa, provisional designation {{mp\|1921 JP}}, is a stony Phocaea asteroid and slow rotator from the inner regions of the asteroid belt, approximately 15 kilometers in diameter. It was discovered on 1 April 1921, by German astronomer Karl Reinmuth at Heidelberg Observatory in southern Germany.^[20] Description The S-type asteroid, classified as a Sa-subtype in the SMASS taxonomic scheme, is a member of the Phocaea family, a group of asteroids with similar orbital characteristics. It orbits the Sun at a distance of 2.0–2.7 AU once every 3 years and 8 months (1,334 days). Its orbit shows an eccentricity of 0.16 and is tilted by 23 degrees to the plane of the ecliptic. A photometric lightcurve analysis at the U.S. Palmer Divide Observatory in 2009, showed that the body has an exceptionally long rotation period of 202 hours.^[10] According to the surveys carried out by the Infrared Astronomical Satellite, IRAS, the Japanese Akari satellite, and the U.S. Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the surface of the asteroid has an albedo in the range of 0.16 to 0.23, while the Collaborative Asteroid Lightcurve Link derives an even higher value of 0.27 for the stony body.^[5]^[6]^[7]^[8] The minor planet was named in honor of friends of the discoverer Karl Reinmuth, the Ahrens family, who helped him financially at the Heidelberg Observatory. Reinmuth also named the minor planet 909 Ulla after Ulla Ahrens, a member of this family.^[2] References 1. ^¹²³⁴⁵{{cite web \|type=2015-10-30 last obs. \|title=JPL Small-Body Database Browser: 950 Ahrensa (1921 JP) \|url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2000950 \|publisher=Jet Propulsion Laboratory \|accessdate=2 May 2016}} 2. ^¹²{{cite book \|title=Dictionary of Minor Planet Names – (950) Ahrensa \|last=Schmadel \|first=Lutz D. \|publisher=Springer Berlin Heidelberg \|page=84 \|date=2003 \|isbn=978-3-540-29925-7 \|doi=10.1007/978-3-540-29925-7_951 \|chapter = (950) Ahrensa}} 3. ^¹{{cite web \|title=950 Ahrensa (1921 JP) \|work=Minor Planet Center \|url=http://www.minorplanetcenter.net/db_search/show_object?object_id=950 \|accessdate=4 January 2016}} 4. ^¹²³{{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= 4 January 2016}} 5. ^¹²³{{cite journal \|display-authors = 6 \|first1 = Fumihiko \|last1 = Usui \|first2 = Daisuke \|last2 = Kuroda \|first3 = Thomas G. \|last3 = Müller \|first4 = Sunao \|last4 = Hasegawa \|first5 = Masateru \|last5 = Ishiguro \|first6 = Takafumi \|last6 = Ootsubo \|first7 = Daisuke \|last7 = Ishihara \|first8 = Hirokazu \|last8 = Kataza \|first9 = Satoshi \|last9 = Takita \|first10 = Shinki \|last10 = Oyabu \|first11 = Munetaka \|last11 = Ueno \|first12 = Hideo \|last12 = Matsuhara \|first13 = Takashi \|last13 = Onaka \|date = October 2011 \|title = Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey \|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011PASJ...63.1117U \|journal = Publications of the Astronomical Society of Japan \|volume = 63 \|issue = 5 \|pages = 1117–1138 \|bibcode = 2011PASJ...63.1117U \|doi = 10.1093/pasj/63.5.1117 \|access-date= 4 January 2016}} 6. ^¹²³{{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 \|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...90M \|journal = The Astrophysical Journal \|volume = 741 \|issue = 2 \|page = 25 \|bibcode = 2011ApJ...741...90M \|doi = 10.1088/0004-637X/741/2/90 \|access-date= 4 January 2016\|arxiv = 1109.6407 }} 7. ^¹²³{{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 \|access-date= 4 January 2016\|arxiv = 1209.5794 }} 8. ^¹²{{cite journal \|author = Warner, Brian D. \|date = January 2010 \|title = Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2009 June-September \|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2010MPBu...37...24W \|journal = The Minor Planet Bulletin \|volume = 37 \|issue = 1 \|pages = 24–27 \|issn = 1052-8091 \|bibcode = 2010MPBu...37...24W \|access-date= 4 January 2016}} ^[1]^[2]^[3]^[4]^[5]^[6]^[7]^[8] }} External links Lightcurve plot of 950 Ahrensa, Palmer Divide Observatory, B. D. Warner (2009) 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 Genève, Raoul Behrend Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center {{AstDys\|950}} {{JPL small body}} {{Use dmy dates\|date=July 2018}}{{Minor planets navigator \|949 Hel \|number=950 \|951 Gaspra}}{{Small Solar System bodies}}{{DEFAULTSORT:Ahrensa}} 7 : Phocaea asteroids\|Discoveries by Karl Wilhelm Reinmuth\|Minor planets named for people\|Named minor planets\|Slow rotating minor planets\|Sa-type asteroids (SMASS)\|Astronomical objects discovered in 1921
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References

External links