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5751 Zao (1992 AC)
Classification: Amor [NEO]          SPK-ID: 2005751
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 269 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4240184454756694 4.076e-08  
a 2.103901606175034 1.1083e-08 au
q 1.211808517690932 8.8058e-08 au
i 16.07729756257979 5.1234e-06 deg
node 121.6651838974615 1.173e-05 deg
peri 25.35585976734969 1.9947e-05 deg
M 161.6261517671889 3.0627e-05 deg
tp 2458700.067281168031
(2019-Aug-04.56728117)
9.0914e-05 TDB
period 1114.644980467088
3.05
8.8077e-06
2.411e-08
d
yr
n .3229727907168642 2.5521e-09 deg/d
Q 2.995994694659136 1.5783e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1604  
   data-arc span      11464 days (31.39 yr)  
   first obs. used      1989-03-10  
   last obs. used      2020-07-29  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51805  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 17:55:18  

Additional Information
 Earth MOID = .244213 au 
 Jupiter MOID = 2.06783 au 
 T_jup = 3.580 
[ 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 14.75   n/a E2021B10  
diameter diameter 2.3 km n/a Delbo et al. (2003). Icarus, v. 166, pp. 116-130  
rotation period rot_per 76. 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:
[Pravec, P.; Wolf, M.; Sarounova, L. (1995) http://www.asu.cas.cz/~ppravec/neo.htm]
[Pravec, P.; Wolf, M.; Sarounova, L. (1998) http://www.asu.cas.cz/~ppravec/neo.htm]
geometric albedo albedo 0.36   n/a Delbo et al. (2003). Icarus, v. 166, pp. 116-130  
SMASSII spectral type spec_B X   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

5751 Zao (1992 AC)          Discovered 1992-Jan-05 by Koishikawa, M. at Ayashi
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1992 AC = 1989 EN1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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