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JPL Small-Body Database Browser
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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 121 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3601765531257606 2.7971e-09  
a 1.488763415587547 1.4342e-09 au
q .9525457401414902 4.0373e-09 au
i 1.43199203272837 2.5093e-06 deg
node 314.4085913650595 2.9772e-05 deg
peri 158.064841387412 3.0909e-05 deg
M 184.8919545342345 5.5616e-06 deg
tp 2458923.230907116630
(2020-Mar-14.73090712)
1.0711e-05 TDB
period 663.4939374313403
1.82
9.5874e-07
2.625e-09
d
yr
n .5425821996109098 7.8402e-10 deg/d
Q 2.024981091033604 1.9507e-09 au
  Orbit Determination Parameters
   # obs. used (total)      698  
   # delay obs. used      16  
   # Doppler obs. used      16  
   data-arc span      13927 days (38.13 yr)  
   first obs. used      1981-09-30  
   last obs. used      2019-11-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46706  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-17 04:52:59  

Additional Information
 Earth MOID = .00315334 au 
 Jupiter MOID = 3.09769 au 
 T_jup = 4.493 
[ 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 18.2   n/a MPO263389  
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-January); 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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