+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   3873 Roddy (1984 WB) Classification: Mars-crossing Asteroid          SPK-ID: 2003873 [ 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 .1339372554634311 4.923e-08   a 1.892179135601739 4.7132e-09 au q 1.638745855334074 9.3608e-08 au i 23.35245759412759 3.4561e-06 deg node 250.0443852175484 1.1323e-05 deg peri 267.7039393723453 1.7685e-05 deg M 159.3290049523562 1.6418e-05 deg tp 2458579.740292995990 (2019-Apr-06.24029300) 4.2856e-05 TDB period 950.696293915464 2.60 3.5521e-06 9.725e-09 d yr n .3786698257940314 1.4148e-09 deg/d Q 2.145612415869403 5.3444e-09 au   Orbit Determination Parameters    # obs. used (total)      2629      data-arc span      13146 days (35.99 yr)      first obs. used      1984-11-19      last obs. used      2020-11-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .35741      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 02:14:36   Additional Information  Earth MOID = .786315 au   Jupiter MOID = 3.07231 au   T_jup = 3.847  [ hide covariance matrix ] Orbital Elements at Epoch 2457413.5 (2016-Jan-26.0) TDB Reference: JPL 34 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1337924559099792 4.921e-08   q 1.638901179116785 9.3524e-08 au tp 2457628.944410785062 (2016-Aug-28.44441079) 4.1945e-05 TDB node 250.0667804103907 1.1322e-05 deg peri 267.6605768569983 1.77e-05 deg i 23.3544412142603 3.4564e-06 deg   Orbit Determination Parameters    # obs. used (total)      2629      data-arc span      13146 days (35.99 yr)      first obs. used      1984-11-19      last obs. used      2020-11-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .35741      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 02:14:36   Additional Information  Jupiter MOID = 3.07231 au   T_jup = 3.847  Orbit Covariance (6×6)   e q tp node peri i e 2.421580698765181E-15 -4.597955920735479E-15 -5.358323355931017E-13 1.603389051081127E-14 -1.264811546479624E-13 1.76604705683149E-14 q -4.597955920735479E-15 8.746709137805398E-15 1.052370504741167E-12 -3.003993470530477E-14 2.496792828484497E-13 -3.325556388232191E-14 tp -5.358323355931017E-13 1.052370504741167E-12 1.759424203884433E-9 -3.985678025425409E-12 5.878793337180785E-10 2.164030149956761E-12 node 1.603389051081127E-14 -3.003993470530477E-14 -3.985678025425409E-12 1.281777559850433E-10 -1.182915122435921E-10 -5.971516155968145E-13 peri -1.264811546479624E-13 2.496792828484497E-13 5.878793337180785E-10 -1.182915122435921E-10 3.132932784617946E-10 1.81319699751375E-12 i 1.76604705683149E-14 -3.325556388232191E-14 2.164030149956761E-12 -5.971516155968145E-13 1.81319699751375E-12 1.194641098180184E-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 12.8   n/a MPO302086   diameter diameter 5.021 km 0.581 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)   rotation period rot_per 2.4782 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Warner, B.D. (2006) Minor Planet Bull. 33, 58-62.] [Warner, B.D. (2008) Minor Planet Bull. 35, 56-60.] [Warner, B.D. (2009) Minor Planet Bull. 36, 172-176.] [Warner, B.D. (2011) Minor Planet Bull. 38, 82-86.] [Warner, B.D. (2013). Minor Planet Bull. 40, 36-42.] [Pravec, P.; Wolf, M.; Sarounova, L. (2015) http://www.asu.cas.cz/~ppravec/neo.htm] [Klinglesmith III, D.A.; Hendrickx, S.; Madden, K.; Montgomery, S. (2016) Minor Planet Bull. 43, 123-128.] [Warner, B.D. (2016) Minor Planet Bull. 43, 57-65.] geometric albedo albedo 0.419   0.164 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)   SMASSII spectral type spec_B S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002) 3873 Roddy (1984 WB)          Discovered 1984-Nov-21 by Shoemaker, C. at Palomar Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1984 WB = 1953 XK1  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-27 11:54 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin