+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   3031 Houston (1984 CX) Classification: Main-belt Asteroid          SPK-ID: 2003031 [ 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 36 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .09768165427084588 3.7736e-08   a 2.236318715069232 7.0844e-09 au q 2.017871403504417 8.5379e-08 au i 4.340801482718132 3.8075e-06 deg node 317.7363307098477 4.9257e-05 deg peri 249.16689520034 5.4292e-05 deg M 265.856753179878 2.6043e-05 deg tp 2459319.937314241921 (2021-Apr-15.43731424) 8.9213e-05 TDB period 1221.515477863382 3.34 5.8045e-06 1.589e-08 d yr n .2947158726385484 1.4004e-09 deg/d Q 2.454766026634047 7.7765e-09 au   Orbit Determination Parameters    # obs. used (total)      2340      data-arc span      24158 days (66.14 yr)      first obs. used      1954-03-05      last obs. used      2020-04-25      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .44546      source      ORB      producer      Otto Matic      solution date      2020-May-20 01:48:44   Additional Information  Earth MOID = 1.01841 au   Jupiter MOID = 2.52284 au   T_jup = 3.628  [ show covariance matrix ] [ 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 MPO431531   diameter diameter 6.430 km 0.141 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   rotation period rot_per 11.218 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List: [Ditteon, R.; Horn, L.; Kamperman, A.; Vorjohan, B.; Kirkpatrick, E. (2012) Minor Planet Bull. 39, 26-28.] [Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.] geometric albedo albedo 0.270   0.028 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   3031 Houston (1984 CX)          Discovered 1984-Feb-08 by Bowell, E. at Flagstaff (AM) Discovered at the Anderson Mesa station, which is operated by the Lowell Observatory. Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1984 CX = 1954 EF = 1978 NP = 1979 VT1 = 1981 JL1  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Sep-25 08:20 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin