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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 2456800.5 (2014-May-23.0) TDB
Reference: JPL 95 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .360057199032999 3.1229e-09  
a 1.488604073301046 2.8892e-09 AU
q .9526214601991583 4.2082e-09 AU
i 1.432003160920649 2.6259e-06 deg
node 314.4590750941519 3.0922e-05 deg
peri 158.0156751858964 3.2073e-05 deg
M 288.21170990216 7.6367e-06 deg
tp 2456932.787357032990
(2014-Oct-02.28735703)
1.4455e-05 JED
period 663.3874196887897
1.82
1.9314e-06
5.288e-09
d
yr
n .5426693200918465 1.5799e-09 deg/d
Q 2.024586686402934 3.9295e-09 AU
  Orbit Determination Parameters
   # obs. used (total)      541  
   # delay obs. used      16  
   # Doppler obs. used      16  
   data-arc span      11571 days (31.68 yr)  
   first obs. used      1981-09-30  
   last obs. used      2013-06-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .485  
   data source      ORB  
   producer      Otto Matic  
   solution date      2013-Aug-05 09:19:00  

Additional Information
 Earth MOID = .00319609 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 Asteroid Lightcurve DataBase (Rev. 2013-Sep-12) 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 (675)
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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