+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1806 Derice (1971 LC) Classification: Main-belt Asteroid          SPK-ID: 2001806 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 41 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1072108819035587 3.4607e-08   a 2.236434401853967 5.1502e-09 au q 1.996664297311745 7.8606e-08 au i 3.843525374446064 3.6712e-06 deg node 271.0647574715593 5.3885e-05 deg peri 193.6147893337039 5.7146e-05 deg M 67.80091523313767 1.8186e-05 deg tp 2458970.426961185052 (2020-Apr-30.92696118) 6.159e-05 TDB period 1221.610264235781 3.34 4.2198e-06 1.155e-08 d yr n .2946930052402678 1.018e-09 deg/d Q 2.476204506396188 5.7023e-09 au   Orbit Determination Parameters    # obs. used (total)      2821      data-arc span      25993 days (71.16 yr)      first obs. used      1949-11-25      last obs. used      2021-01-24      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .44206      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 00:58:18   Additional Information  Earth MOID = 1.0136 au   Jupiter MOID = 2.63085 au   T_jup = 3.627  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 12.08   n/a E2021B10   diameter diameter 7.976 km 0.759 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 3.2240 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Pray, D.P.; Galad, A.; Husark, M.; Oey, J. (2008) Minor Planet Bull. 35, 34-37.] [Pravec, P.; Wolf, M.; Sarounova, L. (2009) http://www.asu.cas.cz/~ppravec/neo.htm] [Pravec, P.; Wolf, M.; Sarounova, L. (2011) http://www.asu.cas.cz/~ppravec/neo.htm] [Pravec, P.; Wolf, M.; Sarounova, L. (2012) http://www.asu.cas.cz/~ppravec/neo.htm] [Pravec, P.; Wolf, M.; Sarounova, L. (2016) http://www.asu.cas.cz/~ppravec/neo.htm] [Aznar, A.M. (2017) Minor Planet Bull. 44, 139-141.] [Stephens, R.D.; Warner, B.D. (2020) Minor Planet Bull. 47, 224-230.] geometric albedo albedo 0.035   0.149 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   1806 Derice           Discovered 1971 June 13 at the Perth Observatory. Named in honor of the wife of Dennis Harwood, member of the astrometric team at the Perth Observatory. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: MPC 6530 Last Updated: 2006-03-21 [ show close-approach data ] Alternate Designations  1971 LC = 1927 EB = 1942 TD = 1949 YD = 1967 EB  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-07 09:54 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin