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4660 Nereus (1982 DB)
Classification: Apollo [NEO, PHA]          SPK-ID: 2004660
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 127 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .360038838767106 2.7838e-09  
a 1.488960980933162 1.4596e-09 au
q .9528771983884553 4.0086e-09 au
i 1.431648453552345 2.4899e-06 deg
node 314.4065229210323 2.9571e-05 deg
peri 158.1163448743114 3.0706e-05 deg
M 256.7084300953799 6.0902e-06 deg
tp 2459586.908257989417
(2022-Jan-07.40825799)
1.1504e-05 TDB
period 663.6260145865422
1.82
9.758e-07
2.672e-09
d
yr
n .542474213016333 7.9766e-10 deg/d
Q 2.025044763477868 1.9851e-09 au
  Orbit Determination Parameters
   # obs. used (total)      717  
   # delay obs. used      16  
   # Doppler obs. used      16  
   data-arc span      14067 days (38.51 yr)  
   first obs. used      1981-09-30  
   last obs. used      2020-04-05  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46945  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-14 05:53:03  

Additional Information
 Earth MOID = .00310131 au 
 Jupiter MOID = 3.09612 au 
 T_jup = 4.492 
[ 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 18.31   n/a E2021B10  
diameter diameter 0.33 km n/a Delbo et al. (2003). Icarus, v. 166, pp. 116-130  
rotation period rot_per 15.1 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:
[Ishibashi, Y.; Abe, M.; Takagi, Y. (1998) Lunar and Planetary Sci. XVIX, #1758.]
[Ishibashi, Y.; Abe, M.; Takagi, Y. (2000) Adv. Space Res. 25, 277-280.]
[Brozovic, M.; Ostro, S.J.; Benner, L.A.M.; Giorgini, J.D.; et al. (2009) Icarus 201, 153-166.]
geometric albedo albedo 0.55   n/a Delbo et al. (2003). Icarus, v. 166, pp. 116-130  
SMASSII spectral type spec_B Xe   n/a Binzel et al. (2004) Planet. Space Sci. 52, 291-296  

4660 Nereus (1982 DB)          Discovered 1982-Feb-28 by Helin, E. F. at Palomar
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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