“(5645) 1990 SP”的意思、由来-开放百科全书

The asteroid orbits the Sun at a distance of 0.8–1.9 AU once every 1 years and 7 months (576 days). Its orbit has an eccentricity of 0.39 and an inclination of 14° with respect to the ecliptic.

Close approaches

This near-Earth asteroid has an Earth minimum orbit intersection distance of {{convert|0.055|AU|km|abbr=on}}, only slightly above the threshold minimum distance of 19.5 lunar distances (0.05 AU) to make it a potentially hazardous object. It also makes close approaches to Mars. On 14 April 1969, it passed the Red Planet at only {{convert|0.013|AU|km|abbr=on|sigfig=2}}.

Precovery

Published by the Digitized Sky Survey (DSS), a first precovery was taken at the discovering observatory in 1974, extending the asteroid's observation arc by 16 years prior to its discovery.^[2]

Physical characteristics

The stony S-type asteroid is also characterized as a P-type, based on post-cryogenic observations by the Spitzer Space Telescope,^[11] while observations at the NASA Infrared Telescope Facility using its SpeX instrument during a follow-up campaign of the Spitzer-observed objects between 2009 and 2012, gave it a C/X/T spectral type.^[18]

Rotation

In April 2002, Czech astronomer Petr Pravec obtained a rotational lightcurve from a photometric observations, which gave a relatively long period of {{val|30.39|0.04}} hours with a brightness variation of 0.7 in magnitude ({{small|U=2}}). The observations have also shown that the body is most likely in a tumbling motion.^[5]^[10]

Diameter and albedo

Estimates for the body's diameter range from 1.6 to 2.2 kilometers with an albedo for its surface between 0.06 and 0.12, according to observations made by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer and by the Spitzer Space Telescope.^[4]^[6]^[7]^[8]^[9] The Collaborative Asteroid Lightcurve Link takes the revised WISE data – an albedo of 0.0872 and a diameter of 1.65 kilometers – as the best of all available results.^[4]^[5]

References

1. ^¹²³{{cite web |title = 5645 (1990 SP) |work = Minor Planet Center |url = http://www.minorplanetcenter.net/db_search/show_object?object_id=5645 |accessdate = 29 June 2016}}
2. ^¹²³⁴⁵{{cite web |title = LCDB Data for (5645) |publisher = Asteroid Lightcurve Database (LCDB) |url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=5645%7C |accessdate = 29 June 2016}}
3. ^¹²³{{Cite journal |display-authors = 6 |first1 = Michael |last1 = Mueller |first2 = M. |last2 = Delbo' |first3 = J. L. |last3 = Hora |first4 = D. E. |last4 = Trilling |first5 = B. |last5 = Bhattacharya |first6 = W. F. |last6 = Bottke |first7 = S. |last7 = Chesley |first8 = J. P. |last8 = Emery |first9 = G. |last9 = Fazio |first10 = A. W. |last10 = Harris |first11 = A. |last11 = Mainzer |first12 = M. |last12 = Mommert |first13 = B. |last13 = Penprase |first14 = H. A. |last14 = Smith |first15 = T. B. |last15 = Spahr |first16 = J. A. |last16 = Stansberry |first17 = C. A. |last17 = Thomas |date = April 2011 |title = ExploreNEOs. III. Physical Characterization of 65 Potential Spacecraft Target Asteroids |journal = The Astronomical Journal |volume = 141 |issue = 4 |page = 9 |bibcode = 2011AJ....141..109M |doi = 10.1088/0004-6256/141/4/109 }}
4. ^¹²³⁴⁵{{Cite journal |first1 = Petr |last1 = Pravec |first2 = Alan W. |last2 = Harris |first3 = Peter |last3 = Kusnirák |first4 = Adrián |last4 = Galád |first5 = Kamil |last5 = Hornoch |date = September 2012 |title = Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations |journal = Icarus |volume = 221 |issue = 1 |pages = 365–387 |bibcode = 2012Icar..221..365P |doi = 10.1016/j.icarus.2012.07.026 }}
5. ^¹²³⁴{{Cite journal |display-authors = 6 |first1 = A. |last1 = Mainzer |first2 = T. |last2 = Grav |first3 = J. |last3 = Masiero |first4 = J. |last4 = Bauer |first5 = R. M. |last5 = Cutri |first6 = R. S. |last6 = McMillan |first7 = C. R. |last7 = Nugent |first8 = D. |last8 = Tholen |first9 = R. |last9 = Walker |first10 = E. L. |last10 = Wright |date = November 2012 |title = Physical Parameters of Asteroids Estimated from the WISE 3-Band Data and NEOWISE Post-Cryogenic Survey |journal = The Astrophysical Journal Letters |volume = 760 |issue = 1 |page = 6 |bibcode = 2012ApJ...760L..12M |doi = 10.1088/2041-8205/760/1/L12 |arxiv = 1210.0502 }}
6. ^¹²³⁴{{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. ^¹²³{{Cite journal |display-authors = 6 |first1 = P. |last1 = Pravec |first2 = A. W. |last2 = Harris |first3 = P. |last3 = Scheirich |first4 = P. |last4 = Kusnirák |first5 = L. |last5 = Sarounová |first6 = C. W. |last6 = Hergenrother |first7 = S. |last7 = Mottola |first8 = M. D. |last8 = Hicks |first9 = G. |last9 = Masi |first10 = Yu. N. |last10 = Krugly |first11 = V. G. |last11 = Shevchenko |first12 = M. C. |last12 = Nolan |first13 = E. S. |last13 = Howell |first14 = M. |last14 = Kaasalainen |first15 = A. |last15 = Galád |first16 = P. |last16 = Brown |first17 = D. R. |last17 = DeGraff |first18 = J. V. |last18 = Lambert |first19 = W. R. |last19 = Cooney |first20 = S. |last20 = Foglia |date = January 2005 |title = Tumbling asteroids |journal = Icarus |volume = 173 |issue = 1 |pages = 108–131 |bibcode = 2005Icar..173..108P |doi = 10.1016/j.icarus.2004.07.021 }}
8. ^¹²³{{Cite journal |display-authors = 6 |first1 = C. A. |last1 = Thomas |first2 = D. E. |last2 = Trilling |first3 = J. P. |last3 = Emery |first4 = M. |last4 = Mueller |first5 = J. L. |last5 = Hora |first6 = L. A. M. |last6 = Benner |first7 = B. |last7 = Bhattacharya |first8 = W. F. |last8 = Bottke |first9 = S. |last9 = Chesley |first10 = M. |last10 = Delbó |first11 = G. |last11 = Fazio |first12 = A. W. |last12 = Harris |first13 = A. |last13 = Mainzer |first14 = M. |last14 = Mommert |first15 = A. |last15 = Morbidelli |first16 = B. |last16 = Penprase |first17 = H. A. |last17 = Smith |first18 = T. B. |last18 = Spahr |first19 = J. A. |last19 = Stansberry |date = September 2011 |title = ExploreNEOs. V. Average Albedo by Taxonomic Complex in the Near-Earth Asteroid Population |journal = The Astronomical Journal |volume = 142 |issue = 3 |page = 12 |bibcode = 2011AJ....142...85T |doi = 10.1088/0004-6256/142/3/85 }}
9. ^¹²{{Cite journal |first1 = Cristina A. |last1 = Thomas |first2 = Joshua P. |last2 = Emery |first3 = David E. |last3 = Trilling |first4 = Marco |last4 = Delbó |first5 = Joseph L. |last5 = Hora |first6 = Michael |last6 = Mueller |date = January 2014 |title = Physical characterization of Warm Spitzer-observed near-Earth objects |journal = Icarus |volume = 228 |pages = 217–246 |bibcode = 2014Icar..228..217T |doi = 10.1016/j.icarus.2013.10.004 |arxiv = 1310.2000 }}
10. ^¹²³{{Cite journal |display-authors = 6 |first1 = A. |last1 = Mainzer |first2 = T. |last2 = Grav |first3 = J. |last3 = Bauer |first4 = J. |last4 = Masiero |first5 = R. S. |last5 = McMillan |first6 = R. M. |last6 = Cutri |first7 = R. |last7 = Walker |first8 = E. |last8 = Wright |first9 = P. |last9 = Eisenhardt |first10 = D. J. |last10 = Tholen |first11 = T. |last11 = Spahr |first12 = R. |last12 = Jedicke |first13 = L. |last13 = Denneau |first14 = E. |last14 = DeBaun |first15 = D. |last15 = Elsbury |first16 = T. |last16 = Gautier |first17 = S. |last17 = Gomillion |first18 = E. |last18 = Hand |first19 = W. |last19 = Mo |first20 = J. |last20 = Watkins |first21 = A. |last21 = Wilkins |first22 = G. L. |last22 = Bryngelson |first23 = A. |last23 = Del Pino Molina |first24 = S. |last24 = Desai |first25 = M. |last25 = Gómez Camus |first26 = S. L. |last26 = Hidalgo |first27 = I. |last27 = Konstantopoulos |first28 = J. A. |last28 = Larsen |first29 = C. |last29 = Maleszewski |first30 = M. A. |last30 = Malkan |first31 = J.-C. |last31 = Mauduit |first32 = B. L. |last32 = Mullan |first33 = E. W. |last33 = Olszewski |first34 = J. |last34 = Pforr |first35 = A. |last35 = Saro |first36 = J. V. |last36 = Scotti |first37 = L. H. |last37 = Wasserman |date = December 2011 |title = NEOWISE Observations of Near-Earth Objects: Preliminary Results |journal = The Astrophysical Journal |volume = 743 |issue = 2 |page = 17 |bibcode = 2011ApJ...743..156M |doi = 10.1088/0004-637X/743/2/156 |arxiv = 1109.6400 }}

词条	(5645) 1990 SP
释义	Orbit and classification Close approaches Precovery Physical characteristics Rotation Diameter and albedo References External links {{Infobox planet \| minorplanet = yes \| name = (5645) 1990 SP \| background = #FFC2E0 \| image = \| image_size = \| caption = \| discovery_ref = \| discovered = 20 September 1990 \| discoverer = R. H. McNaught \| discovery_site = Siding Spring Obs. \| mpc_name = (5645) 1990 SP \| alt_names = 1990 SP \| pronounced = \| named_after = \| mp_category = Apollo{{·}}NEO ^[2] \| orbit_ref = \| epoch = 4 September 2017 (JD 2458000.5) \| uncertainty = 0 \| observation_arc = 40.89 yr (14,935 days) \| aphelion = 1.8798 AU \| perihelion = 0.8302 AU \| semimajor = 1.3550 AU \| eccentricity = 0.3873 \| period = 1.58 yr (576 days) \| mean_anomaly = 339.42° \| mean_motion = {{Deg2DMS\|0.6249\|sup=ms}} / day \| inclination = 13.507° \| asc_node = 45.762° \| arg_peri = 48.178° \| moid = 0.0537 AU \| dimensions = {{val\|1.648\|}} km^[4] 1.65 km {{small\|(taken)}}^[5] {{val\|1.668\|0.018}} km^[6]^[7] {{val\|1.849\|0.334}} km^[8] {{val\|2.20\|0.74}} km^[9] \| rotation = {{val\|30.39\|0.04}} h^[10] \| albedo = {{val\|0.06\|0.08}}^[11] {{val\|0.062\|0.079}}^[9] {{val\|0.068\|0.032}}^[8] {{val\|0.0827\|}}^[4] {{val\|0.121\|0.022}}^[6]^[7] \| spectral_type = P ^[11]{{·}}CXT ^[18]{{·}}S ^[5] \| abs_magnitude = {{val\|16.75\|0.2}} {{small\|(R)}}^[10]{{·}}16.8^[6]{{·}}17.1{{·}}{{val\|17.20\|0.3}}^[8]{{·}}{{val\|17.24\|0.206}}^[4]^[5] }}(5645) 1990 SP is an eccentric and tumbling asteroid, classified as near-Earth object of the Apollo group, approximately 1.7 kilometers in diameter. It was discovered on 20 September 1990, by Scottish–Australian astronomer Robert McNaught at the Siding Spring Observatory in Canberra, Australia.^[2] Orbit and classification The asteroid orbits the Sun at a distance of 0.8–1.9 AU once every 1 years and 7 months (576 days). Its orbit has an eccentricity of 0.39 and an inclination of 14° with respect to the ecliptic. Close approaches This near-Earth asteroid has an Earth minimum orbit intersection distance of {{convert\|0.055\|AU\|km\|abbr=on}}, only slightly above the threshold minimum distance of 19.5 lunar distances (0.05 AU) to make it a potentially hazardous object. It also makes close approaches to Mars. On 14 April 1969, it passed the Red Planet at only {{convert\|0.013\|AU\|km\|abbr=on\|sigfig=2}}. Precovery Published by the Digitized Sky Survey (DSS), a first precovery was taken at the discovering observatory in 1974, extending the asteroid's observation arc by 16 years prior to its discovery.^[2] Physical characteristics The stony S-type asteroid is also characterized as a P-type, based on post-cryogenic observations by the Spitzer Space Telescope,^[11] while observations at the NASA Infrared Telescope Facility using its SpeX instrument during a follow-up campaign of the Spitzer-observed objects between 2009 and 2012, gave it a C/X/T spectral type.^[18] Rotation In April 2002, Czech astronomer Petr Pravec obtained a rotational lightcurve from a photometric observations, which gave a relatively long period of {{val\|30.39\|0.04}} hours with a brightness variation of 0.7 in magnitude ({{small\|U=2}}). The observations have also shown that the body is most likely in a tumbling motion.^[5]^[10] Diameter and albedo Estimates for the body's diameter range from 1.6 to 2.2 kilometers with an albedo for its surface between 0.06 and 0.12, according to observations made by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer and by the Spitzer Space Telescope.^[4]^[6]^[7]^[8]^[9] The Collaborative Asteroid Lightcurve Link takes the revised WISE data – an albedo of 0.0872 and a diameter of 1.65 kilometers – as the best of all available results.^[4]^[5] References 1. ^¹²³{{cite web \|title = 5645 (1990 SP) \|work = Minor Planet Center \|url = http://www.minorplanetcenter.net/db_search/show_object?object_id=5645 \|accessdate = 29 June 2016}} 2. ^¹²³⁴⁵{{cite web \|title = LCDB Data for (5645) \|publisher = Asteroid Lightcurve Database (LCDB) \|url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=5645%7C \|accessdate = 29 June 2016}} 3. ^¹²³{{Cite journal \|display-authors = 6 \|first1 = Michael \|last1 = Mueller \|first2 = M. \|last2 = Delbo' \|first3 = J. L. \|last3 = Hora \|first4 = D. E. \|last4 = Trilling \|first5 = B. \|last5 = Bhattacharya \|first6 = W. F. \|last6 = Bottke \|first7 = S. \|last7 = Chesley \|first8 = J. P. \|last8 = Emery \|first9 = G. \|last9 = Fazio \|first10 = A. W. \|last10 = Harris \|first11 = A. \|last11 = Mainzer \|first12 = M. \|last12 = Mommert \|first13 = B. \|last13 = Penprase \|first14 = H. A. \|last14 = Smith \|first15 = T. B. \|last15 = Spahr \|first16 = J. A. \|last16 = Stansberry \|first17 = C. A. \|last17 = Thomas \|date = April 2011 \|title = ExploreNEOs. III. Physical Characterization of 65 Potential Spacecraft Target Asteroids \|journal = The Astronomical Journal \|volume = 141 \|issue = 4 \|page = 9 \|bibcode = 2011AJ....141..109M \|doi = 10.1088/0004-6256/141/4/109 }} 4. ^¹²³⁴⁵{{Cite journal \|first1 = Petr \|last1 = Pravec \|first2 = Alan W. \|last2 = Harris \|first3 = Peter \|last3 = Kusnirák \|first4 = Adrián \|last4 = Galád \|first5 = Kamil \|last5 = Hornoch \|date = September 2012 \|title = Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations \|journal = Icarus \|volume = 221 \|issue = 1 \|pages = 365–387 \|bibcode = 2012Icar..221..365P \|doi = 10.1016/j.icarus.2012.07.026 }} 5. ^¹²³⁴{{Cite journal \|display-authors = 6 \|first1 = A. \|last1 = Mainzer \|first2 = T. \|last2 = Grav \|first3 = J. \|last3 = Masiero \|first4 = J. \|last4 = Bauer \|first5 = R. M. \|last5 = Cutri \|first6 = R. S. \|last6 = McMillan \|first7 = C. R. \|last7 = Nugent \|first8 = D. \|last8 = Tholen \|first9 = R. \|last9 = Walker \|first10 = E. L. \|last10 = Wright \|date = November 2012 \|title = Physical Parameters of Asteroids Estimated from the WISE 3-Band Data and NEOWISE Post-Cryogenic Survey \|journal = The Astrophysical Journal Letters \|volume = 760 \|issue = 1 \|page = 6 \|bibcode = 2012ApJ...760L..12M \|doi = 10.1088/2041-8205/760/1/L12 \|arxiv = 1210.0502 }} 6. ^¹²³⁴{{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. ^¹²³{{Cite journal \|display-authors = 6 \|first1 = P. \|last1 = Pravec \|first2 = A. W. \|last2 = Harris \|first3 = P. \|last3 = Scheirich \|first4 = P. \|last4 = Kusnirák \|first5 = L. \|last5 = Sarounová \|first6 = C. W. \|last6 = Hergenrother \|first7 = S. \|last7 = Mottola \|first8 = M. D. \|last8 = Hicks \|first9 = G. \|last9 = Masi \|first10 = Yu. N. \|last10 = Krugly \|first11 = V. G. \|last11 = Shevchenko \|first12 = M. C. \|last12 = Nolan \|first13 = E. S. \|last13 = Howell \|first14 = M. \|last14 = Kaasalainen \|first15 = A. \|last15 = Galád \|first16 = P. \|last16 = Brown \|first17 = D. R. \|last17 = DeGraff \|first18 = J. V. \|last18 = Lambert \|first19 = W. R. \|last19 = Cooney \|first20 = S. \|last20 = Foglia \|date = January 2005 \|title = Tumbling asteroids \|journal = Icarus \|volume = 173 \|issue = 1 \|pages = 108–131 \|bibcode = 2005Icar..173..108P \|doi = 10.1016/j.icarus.2004.07.021 }} 8. ^¹²³{{Cite journal \|display-authors = 6 \|first1 = C. A. \|last1 = Thomas \|first2 = D. E. \|last2 = Trilling \|first3 = J. P. \|last3 = Emery \|first4 = M. \|last4 = Mueller \|first5 = J. L. \|last5 = Hora \|first6 = L. A. M. \|last6 = Benner \|first7 = B. \|last7 = Bhattacharya \|first8 = W. F. \|last8 = Bottke \|first9 = S. \|last9 = Chesley \|first10 = M. \|last10 = Delbó \|first11 = G. \|last11 = Fazio \|first12 = A. W. \|last12 = Harris \|first13 = A. \|last13 = Mainzer \|first14 = M. \|last14 = Mommert \|first15 = A. \|last15 = Morbidelli \|first16 = B. \|last16 = Penprase \|first17 = H. A. \|last17 = Smith \|first18 = T. B. \|last18 = Spahr \|first19 = J. A. \|last19 = Stansberry \|date = September 2011 \|title = ExploreNEOs. V. Average Albedo by Taxonomic Complex in the Near-Earth Asteroid Population \|journal = The Astronomical Journal \|volume = 142 \|issue = 3 \|page = 12 \|bibcode = 2011AJ....142...85T \|doi = 10.1088/0004-6256/142/3/85 }} 9. ^¹²{{Cite journal \|first1 = Cristina A. \|last1 = Thomas \|first2 = Joshua P. \|last2 = Emery \|first3 = David E. \|last3 = Trilling \|first4 = Marco \|last4 = Delbó \|first5 = Joseph L. \|last5 = Hora \|first6 = Michael \|last6 = Mueller \|date = January 2014 \|title = Physical characterization of Warm Spitzer-observed near-Earth objects \|journal = Icarus \|volume = 228 \|pages = 217–246 \|bibcode = 2014Icar..228..217T \|doi = 10.1016/j.icarus.2013.10.004 \|arxiv = 1310.2000 }} 10. ^¹²³{{Cite journal \|display-authors = 6 \|first1 = A. \|last1 = Mainzer \|first2 = T. \|last2 = Grav \|first3 = J. \|last3 = Bauer \|first4 = J. \|last4 = Masiero \|first5 = R. S. \|last5 = McMillan \|first6 = R. M. \|last6 = Cutri \|first7 = R. \|last7 = Walker \|first8 = E. \|last8 = Wright \|first9 = P. \|last9 = Eisenhardt \|first10 = D. J. \|last10 = Tholen \|first11 = T. \|last11 = Spahr \|first12 = R. \|last12 = Jedicke \|first13 = L. \|last13 = Denneau \|first14 = E. \|last14 = DeBaun \|first15 = D. \|last15 = Elsbury \|first16 = T. \|last16 = Gautier \|first17 = S. \|last17 = Gomillion \|first18 = E. \|last18 = Hand \|first19 = W. \|last19 = Mo \|first20 = J. \|last20 = Watkins \|first21 = A. \|last21 = Wilkins \|first22 = G. L. \|last22 = Bryngelson \|first23 = A. \|last23 = Del Pino Molina \|first24 = S. \|last24 = Desai \|first25 = M. \|last25 = Gómez Camus \|first26 = S. L. \|last26 = Hidalgo \|first27 = I. \|last27 = Konstantopoulos \|first28 = J. A. \|last28 = Larsen \|first29 = C. \|last29 = Maleszewski \|first30 = M. A. \|last30 = Malkan \|first31 = J.-C. \|last31 = Mauduit \|first32 = B. L. \|last32 = Mullan \|first33 = E. W. \|last33 = Olszewski \|first34 = J. \|last34 = Pforr \|first35 = A. \|last35 = Saro \|first36 = J. V. \|last36 = Scotti \|first37 = L. H. \|last37 = Wasserman \|date = December 2011 \|title = NEOWISE Observations of Near-Earth Objects: Preliminary Results \|journal = The Astrophysical Journal \|volume = 743 \|issue = 2 \|page = 17 \|bibcode = 2011ApJ...743..156M \|doi = 10.1088/0004-637X/743/2/156 \|arxiv = 1109.6400 }} ^[1]^[2]^[3]^[4]^[5]^[6]^[7]^[8]^[9]^[10] }} External links 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 (5001)-(10000) – Minor Planet Center {{JPL small body}} {{Minor planets navigator\|5644 Maureenbell\|number=5645\|(5646) 1990 TR}}{{Small Solar System bodies}}{{DEFAULTSORT:005645}} 3 : Apollo asteroids\|Discoveries by Robert H. McNaught\|Astronomical objects discovered in 1990
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