+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   162004 (1991 VE) Classification: Aten [NEO]          SPK-ID: 2162004 [ 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 214 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .6645999953101889 3.3179e-08   a .8908530115796089 2.2499e-09 au q .2987921042617332 2.9856e-08 au i 7.217901462064093 3.0673e-06 deg node 61.86563522785332 2.2429e-05 deg peri 193.6530062790312 2.2093e-05 deg M 312.5808613800716 8.6255e-06 deg tp 2459240.953738752440 (2021-Jan-26.45373875) 7.499e-06 TDB period 307.1195802944856 0.84 1.1635e-06 3.185e-09 d yr n 1.172181857160684 4.4406e-09 deg/d Q 1.482913918897485 3.7452e-09 au Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A2 [EST] 2.380924096913381E-14 3.5E-15 ALN [SET] 1. n/a NK [SET] 0. n/a NM [SET] 2. n/a R0 [SET] 1. n/a   Orbit Determination Parameters    # obs. used (total)      1110      # delay obs. used      1      # Doppler obs. used      1      data-arc span      24109 days (66.01 yr)      first obs. used      1954-11-24      last obs. used      2020-11-26      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .42629      source      ORB      producer      Otto Matic      solution date      2021-Mar-04 05:56:49   Additional Information  Earth MOID = .0575593 au   Jupiter MOID = 3.58269 au   T_jup = 6.454   Nongravitational accels. using nonstandard g(r) = (1 au/ r)^2  [ 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 18.15   n/a E2021B55   rotation period rot_per 13.4895 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Pravec, P.; Wolf, M.; Sarounova, L. (2012) http://www.asu.cas.cz/~ppravec/neo.htm] [Warner, B.D. (2015) Minor Planet Bull. 42, 115-127.] [Pravec, P.; Wolf, M.; Sarounova, L. (2019) http://www.asu.cas.cz/~ppravec/neo.htm] 162004 (1991 VE)          Discovered 1991-Nov-03 by Helin, E. F., Lawrence, K. J. at Palomar Reference: 20070926/Numbers.arc Last Updated: 2007-09-30 [ show close-approach data ] Alternate Designations  1991 VE = 1997 WP23  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-04 19:47 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin