+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   2166 Handahl (1936 QB) Classification: Main-belt Asteroid          SPK-ID: 2002166 [ 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 40 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2177928784028105 2.9038e-08   a 2.347037533965438 6.4416e-09 au q 1.835869473723671 6.7291e-08 au i 5.136135443709492 3.5015e-06 deg node 163.812538183902 3.3523e-05 deg peri 136.700955650369 3.4317e-05 deg M 183.7918677904187 8.0988e-06 deg tp 2459843.338569824895 (2022-Sep-20.83856983) 3.0588e-05 TDB period 1313.343954305752 3.60 5.4068e-06 1.48e-08 d yr n .2741094583941645 1.1285e-09 deg/d Q 2.858205594207205 7.8445e-09 au   Orbit Determination Parameters    # obs. used (total)      2893      data-arc span      33346 days (91.30 yr)      first obs. used      1929-10-05      last obs. used      2021-01-21      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .42795      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 01:00:50   Additional Information  Earth MOID = .822632 au   Jupiter MOID = 2.38903 au   T_jup = 3.523  [ hide covariance matrix ] Orbital Elements at Epoch 2457057.5 (2015-Feb-04.0) TDB Reference: JPL 40 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2180686108520687 2.8991e-08   q 1.83456053275132 6.7184e-08 au tp 2457217.819788738767 (2015-Jul-14.31978874) 2.772e-05 TDB node 163.8555694540193 3.3515e-05 deg peri 136.8015389381156 3.4309e-05 deg i 5.137163482343515 3.5026e-06 deg   Orbit Determination Parameters    # obs. used (total)      2893      data-arc span      33346 days (91.30 yr)      first obs. used      1929-10-05      last obs. used      2021-01-21      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .42795      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 01:00:50   Additional Information  Jupiter MOID = 2.38903 au   T_jup = 3.523  Orbit Covariance (6×6)   e q tp node peri i e 8.404549438062707E-16 -1.94247076919716E-15 1.850980886544981E-13 -6.209908416449282E-15 4.135290525668505E-14 -8.735235607851575E-16 q -1.94247076919716E-15 4.513668331593704E-15 -4.239090109102602E-13 1.489639647235248E-14 -9.625536793622774E-14 2.074945808137497E-15 tp 1.850980886544981E-13 -4.239090109102602E-13 7.683801212243065E-10 7.51920739498704E-13 2.11623916613163E-10 -1.208160146197244E-12 node -6.209908416449282E-15 1.489639647235248E-14 7.51920739498704E-13 1.123223653623693E-9 -1.117844019365934E-9 7.947398392769049E-12 peri 4.135290525668505E-14 -9.625536793622774E-14 2.11623916613163E-10 -1.117844019365934E-9 1.177089289278384E-9 -8.22435008432012E-12 i -8.735235607851575E-16 2.074945808137497E-15 -1.208160146197244E-12 7.947398392769049E-12 -8.22435008432012E-12 1.22685356789774E-11 [ 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 13.01   n/a E2021B10   diameter diameter 4.327 km 0.753 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   rotation period rot_per 7.2263 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Chang, C.K.; Ip, W.-H.; Lin, H.-W.; Cheng, Y.C.; et al. (2015) Astrophys. J. Supp. Ser. 219, A27.] [Pravec, P.; Wolf, M.; Sarounova, L. (2015) http://www.asu.cas.cz/~ppravec/neo.htm] [Garceran, A.C.; Aznar, A.; Mansego, E.A.; Rodriguez, P.B.; et al. (2016) Minor Planet Bull. 43, 92-97.] [Oey, J.; Williams, H.; Groom, R.; Pray, D.; Benishek, V. (2017) Minor Planet Bull. 44, 193-199.] geometric albedo albedo 0.716   0.196 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   2166 Handahl           Discovered 1936 Aug. 13 by G. Neujmin at Simeis. Named by D. W. E. Green, who found the identifications for this planet, in honor of his mother, Violet Handahl Green. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: MPC 5285 Last Updated: 2007-10-23 [ show close-approach data ] Alternate Designations  1936 QB = 1929 TR = 1943 MD = 1972 RL = 1979 MJ  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Feb-28 22:58 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin