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24856 Messidoro (1996 AA4)
Classification: Main-belt Asteroid          SPK-ID: 2024856
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 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2432638143061402 3.093e-08  
a 2.725618727864102 1.2707e-08 au
q 2.062574319779631 8.5597e-08 au
i 8.829161216025792 4.013e-06 deg
node 159.3868072461948 2.7635e-05 deg
peri 305.0070757576497 2.9355e-05 deg
M 211.749279742839 1.0293e-05 deg
tp 2459877.346823468225
(2022-Oct-24.84682347)
4.9391e-05 TDB
period 1643.59981540657
4.50
1.1494e-05
3.147e-08
d
yr
n .2190314190993922 1.5317e-09 deg/d
Q 3.388663135948573 1.5799e-08 au
  Orbit Determination Parameters
   # obs. used (total)      867  
   data-arc span      10507 days (28.77 yr)  
   first obs. used      1990-09-25  
   last obs. used      2019-07-02  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .54026  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 04:50:22  

Additional Information
 Earth MOID = 1.09347 au 
 Jupiter MOID = 1.82121 au 
 T_jup = 3.296 
[ 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 15.33   n/a MPCxxxxx  
diameter diameter 4.469 km 0.066 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 2.39 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:
[Chang, C.K.; Ip, W.-H.; Lin, H.-W.; Cheng, Y.C.; et al. (2015) Astrophys. J. Supp. Ser. 219, A27.]
geometric albedo albedo 0.067   0.014 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

24856 Messidoro           Discovered 1996 Jan. 15 by M. Tombelli and C. Casacci at Cima Ekar.
Piero Messidoro (b. 1950) is an Italian space engineer who has developed projects and technologies in human and robotic space exploration, notably the International Space Station, new generation transportation systems and moon and Mars missions. He gives international lectures on space exploration system engineering.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20100130/MPCPages.arcLast Updated: 2013-03-29

[ show close-approach data ]
Alternate Designations
 1996 AA4 = 1994 RD19 = 1999 TD39 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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