+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   21910 (1999 VT23) Classification: Main-belt Asteroid          SPK-ID: 2021910 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 35 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1922628346919932 1.909e-08   a 2.267466395396509 6.0001e-09 au q 1.83151687864874 4.4133e-08 au i 6.532093021261205 9.3918e-07 deg node 149.0789409483193 5.8348e-06 deg peri 164.0453302769813 7.2768e-06 deg M 131.9227892657327 7.5029e-06 deg tp 2458743.488592901040 (2019-Sep-16.98859290) 2.5199e-05 TDB period 1247.124226764369 3.41 4.9502e-06 1.355e-08 d yr n .2886641060081164 1.1458e-09 deg/d Q 2.703415912144278 7.1537e-09 au   Orbit Determination Parameters    # obs. used (total)      2260      data-arc span      25408 days (69.56 yr)      first obs. used      1951-08-11      last obs. used      2021-03-04      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .48728      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 03:55:01   Additional Information  Earth MOID = .816729 au   Jupiter MOID = 2.58496 au   T_jup = 3.582  [ 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 13.7   n/a MPO344475   diameter diameter 5.658 km 1.729 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2017AJ....154..168M)   rotation period rot_per 9.4 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so. Published Reference List: [Higgins, D.J. (2012) http://www.david-higgins.com/Astronomy/asteroid/lightcurves.htm] geometric albedo albedo 0.165   0.135 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2017AJ....154..168M)   21910 (1999 VT23)          Discovered 1999-Nov-14 by Juels, C. W. at Fountain Hills Reference: 20010208/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1999 VT23 = 1975 TN2 = 1975 VX5 = 1978 LN = 1978 NL8 = 1998 HE132  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-22 12:14 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin