+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   3908 Nyx (1980 PA) Classification: Amor [NEO]          SPK-ID: 2003908 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 193 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .4589935862527544 3.962e-09   a 1.927872799158858 3.8113e-09 au q 1.042991549233798 8.0551e-09 au i 2.185572809223165 1.2609e-06 deg node 261.2507056176868 4.548e-05 deg peri 126.5623977388364 4.5088e-05 deg M 296.5588789056242 4.3811e-06 deg tp 2459172.799627601876 (2020-Nov-19.29962760) 1.2401e-05 TDB period 977.7233577635226 2.68 2.8994e-06 7.938e-09 d yr n .3682023111562724 1.0919e-09 deg/d Q 2.812754049083919 5.5607e-09 au Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A2 [EST] 2.085479757571682E-14 4.731E-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)      1711      # delay obs. used      15      # Doppler obs. used      1      data-arc span      14682 days (40.20 yr)      first obs. used      1980-08-06      last obs. used      2020-10-17      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .45982      source      ORB      producer      Otto Matic      solution date      2020-Oct-18 08:08:09   Additional Information  Earth MOID = .0573946 au   Jupiter MOID = 2.64644 au   T_jup = 3.780   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 17.3   n/a MPO253389   diameter diameter 1.0 km 0.15 Benner et al. (2002) Icaurs 158:379-388   rotation period rot_per 4.42601 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List: [Drummond, J.D.; Wisniewski, W.Z. (1990) Icarus 83, 349-359.] [Kaasalainen, M.; et al. (2004) Icarus 167, 178-196.] [Cooney, Jr.; W.R.; Gross, J.; Terrell, D.; Reddy, V.; Dyvig, R. (2007) Minor Planet Bull. 34, 47-48.] geometric albedo albedo 0.23   n/a Hazards due to Comets and Asteroids (1994), Ed. T. Gehrels, pp.540-543   Tholen spectral type spec_T V   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 4 color indices; used ground-based radiometric albedo SMASSII spectral type spec_B V   n/a Binzel et al. (2004) Icarus 170, 259-294   3908 Nyx           Discovered 1980 Aug. 6 by H.-E. Schuster at the European Southern Observatory. Named for the goddess and personification of the night. She was a daughter of Chaos and had many children by her brother Erebus, who personifies the subterranean darkness. The realm of Nyx was in the far West, beyond the land of Atlas. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 19990402/MPCPages.arc Last Updated: 2010-06-11 [ show close-approach data ] Alternate Designations  1980 PA = 1988 XB1  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Oct-25 00:52 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin