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

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Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 97 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3600956157373215 3.1169e-09  
a 1.488644643320544 2.7445e-09 AU
q .9525902338699673 4.2256e-09 AU
i 1.431990736972468 2.6374e-06 deg
node 314.4583865423836 3.0985e-05 deg
peri 158.0119171093526 3.2135e-05 deg
M 36.74732974679466 7.6347e-06 deg
tp 2456932.781353212049
(2014-Oct-02.28135321)
1.3883e-05 JED
period 663.4145395500149
1.82
1.8346e-06
5.023e-09
d
yr
n .5426471361996122 1.5006e-09 deg/d
Q 2.02469905277112 3.7328e-09 AU
  Orbit Determination Parameters
   # obs. used (total)      542  
   # delay obs. used      16  
   # Doppler obs. used      16  
   data-arc span      12287 days (33.64 yr)  
   first obs. used      1981-09-30  
   last obs. used      2015-05-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .46217  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-May-23 06:19:07  

Additional Information
 Earth MOID = .00317332 AU 
 T_jup = 4.493 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 18.2 mag 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. 2015-May); 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. CD-ROM, Houston: Lunar & Planetary Inst.]
[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 | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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