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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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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 125 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3603359277287458 2.7842e-09  
a 1.488743084595746 1.4395e-09 au
q .9522954640581828 4.0067e-09 au
i 1.432103476327154 2.4894e-06 deg
node 314.4055513051823 2.9575e-05 deg
peri 158.0702674692276 3.0708e-05 deg
M 41.94650302552807 5.7875e-06 deg
tp 2458923.192554588343
(2020-Mar-14.69255459)
1.0555e-05 TDB
period 663.4803461747241
1.82
9.6233e-07
2.635e-09
d
yr
n .5425933142941899 7.8699e-10 deg/d
Q 2.025190705133308 1.9583e-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.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46875  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Apr-06 05:50:33  

Additional Information
 Earth MOID = .00332828 au 
 Jupiter MOID = 3.0963 au 
 T_jup = 4.493 
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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 18.4   n/a MPO492806  
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. 2019-August); 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

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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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