+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   14874 (1990 US4) Classification: Main-belt Asteroid          SPK-ID: 2014874 [ 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 46 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1962259854300303 1.5031e-08   a 2.330565639470986 6.7526e-09 au q 1.873248100256423 3.4422e-08 au i 7.067152654870037 1.3878e-06 deg node 76.39996706521144 5.3062e-06 deg peri 218.8585592641116 8.6803e-06 deg M 248.5040009519861 5.9118e-06 deg tp 2459602.982700425032 (2022-Jan-23.48270043) 2.2174e-05 TDB period 1299.542345825481 3.56 5.648e-06 1.546e-08 d yr n .2770205997183761 1.204e-09 deg/d Q 2.787883178685549 8.0777e-09 au   Orbit Determination Parameters    # obs. used (total)      2960      data-arc span      11108 days (30.41 yr)      first obs. used      1990-10-16      last obs. used      2021-03-15      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .43399      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 00:41:13   Additional Information  Earth MOID = .8613 au   Jupiter MOID = 2.41358 au   T_jup = 3.535  [ 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 13.79   n/a E2021B10   diameter diameter 4.373 km 0.180 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   rotation period rot_per 6.31 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Ditteon, R.; Johnson, D.; Lin, W.; Wang, Z.; Zhao, B. (2019) Minor Planet Bull. 46, 280-282.] [McNeill, A.; Mommert, M.; Trilling, D.E.; Llama, J.; Skiff, B. (2019) Ap. J. Suppl. Series 245, id.29.] [Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.] geometric albedo albedo 0.335   0.069 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   14874 (1990 US4)          Discovered 1990-Oct-16 by Elst, E. W. at La Silla Reference: 20000523/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1990 US4 = 1993 LM1 = 1999 CZ84  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-21 02:00 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin