+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   3956 Caspar (1988 VL1) Classification: Main-belt Asteroid          SPK-ID: 2003956 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 34 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1797457766313195 3.8687e-08   a 2.239120560132569 5.8521e-09 au q 1.836648096080385 8.5973e-08 au i 4.810037426492714 3.2592e-06 deg node 255.2836840149212 4.6664e-05 deg peri 108.1534482053777 4.7325e-05 deg M 183.3573861726325 8.9354e-06 deg tp 2459600.992552087874 (2022-Jan-21.49255209) 3.1114e-05 TDB period 1223.811820192517 3.35 4.7978e-06 1.314e-08 d yr n .2941628721508579 1.1532e-09 deg/d Q 2.641593024184752 6.904e-09 au   Orbit Determination Parameters    # obs. used (total)      2602      data-arc span      25111 days (68.75 yr)      first obs. used      1951-10-02      last obs. used      2020-07-02      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .4339      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 03:55:41   Additional Information  Earth MOID = .841482 au   Jupiter MOID = 2.84133 au   T_jup = 3.610  [ hide covariance matrix ] Orbital Elements at Epoch 2457183.5 (2015-Jun-10.0) TDB Reference: JPL 34 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1797911729066671 3.8747e-08   q 1.836730777913075 8.6123e-08 au tp 2457151.286829687451 (2015-May-08.78682969) 2.909e-05 TDB node 255.4054312825533 4.6739e-05 deg peri 107.6667818860528 4.7392e-05 deg i 4.805623725889555 3.2561e-06 deg   Orbit Determination Parameters    # obs. used (total)      2602      data-arc span      25111 days (68.75 yr)      first obs. used      1951-10-02      last obs. used      2020-07-02      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .4339      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 03:55:41   Additional Information  Jupiter MOID = 2.84133 au   T_jup = 3.610  Orbit Covariance (6×6)   e q tp node peri i e 1.501310147990635E-15 -3.331965890501876E-15 1.261134902973529E-13 -6.187773380060928E-15 3.051629939244912E-14 -3.13710726542323E-16 q -3.331965890501876E-15 7.41718489679175E-15 -2.741810354353084E-13 1.401497397611906E-14 -6.727449319227468E-14 7.276032093380313E-16 tp 1.261134902973529E-13 -2.741810354353084E-13 8.46215410104585E-10 -5.429918284446806E-13 2.448142444051015E-10 -9.57515092946035E-14 node -6.187773380060928E-15 1.401497397611906E-14 -5.429918284446806E-13 2.184537160962813E-9 -2.176667706359127E-9 -3.170911138770882E-11 peri 3.051629939244912E-14 -6.727449319227468E-14 2.448142444051015E-10 -2.176667706359127E-9 2.246011737515899E-9 3.156600055144203E-11 i -3.13710726542323E-16 7.276032093380313E-16 -9.57515092946035E-14 -3.170911138770882E-11 3.156600055144203E-11 1.060204446564504E-11 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 13.06   n/a E2021B10   diameter diameter 5.439 km 0.231 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   rotation period rot_per 2.77120 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Pravec, P.; Wolf, M.; Sarounova, L. (2008) http://www.asu.cas.cz/~ppravec/neo.htm] [Chirony, V.; Galad, A.; Pravec, P. Kusnirak, P.; et al. (2011) Planet. Space Sci. 59, 1482-1489.] [Behrend, R. (2018) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Mas, V.; Fornas, G.; Lozano, J.; Rodrigo, O.; et al. (2018) Minor Planet Bull. 45, 76-82.] [Pravec, P.; Wolf, M.; Sarounova, L. (2018) http://www.asu.cas.cz/~ppravec/neo.htm] geometric albedo albedo 0.313   0.051 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   3956 Caspar (1988 VL1)          Discovered 1988-Nov-03 by Jensen, P. at Brorfelde Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1988 VL1 = 1951 TD = 1971 QM1 = 1978 WS3 = 1981 RA4 = 1981 SM3 = 1986 AZ1  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Feb-25 03:35 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin