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4581 Asclepius (1989 FC)
Classification: Apollo [NEO, PHA]          SPK-ID: 2004581
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 109 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3569714637703276 6.0229e-08  
a 1.022634386461835 4.5331e-09 au
q .657583092624683 5.8751e-08 au
i 4.917455605259758 2.4538e-06 deg
node 180.2102874306019 2.0269e-05 deg
peri 255.3560585154298 2.048e-05 deg
M 317.8721992635615 1.3588e-05 deg
tp 2459244.702344151526
(2021-Jan-30.20234415)
1.4543e-05 TDB
period 377.727857053443
1.03
2.5116e-06
6.876e-09
d
yr
n .9530671177081473 6.3371e-09 deg/d
Q 1.387685680298987 6.1513e-09 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] -3.60161970487335E-14 5.996E-15
ALN [SET] 1. n/a
NK [SET] 0. n/a
NM [SET] 2. n/a
R0 [SET] 1. n/a
  Orbit Determination Parameters
   # obs. used (total)      422  
   # delay obs. used      2  
   # Doppler obs. used      2  
   data-arc span      11706 days (32.05 yr)  
   first obs. used      1989-03-31  
   last obs. used      2021-04-18  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46634  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-19 06:24:22  

Additional Information
 Earth MOID = .00363712 au 
 Jupiter MOID = 3.87467 au 
 T_jup = 5.913 
 Nongravitational accels. using nonstandard g(r) = (1 au/ r)^2 
[ 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 20.79   n/a E2021B10  
rotation period rot_per 8.008 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Pravec, P.; Wolf, M.; Sarounova, L. (2019) http://www.asu.cas.cz/~ppravec/neo.htm]
[Warner, B.D.; Stephens, R.D. (2019) Minor Planet Bull. 46, 423-438.]

4581 Asclepius (1989 FC)          Discovered 1989-Mar-31 by Holt and Thomas 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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