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JPL Small-Body Database Browser
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2550 Houssay (1976 UP20)
Classification: Main-belt Asteroid          SPK-ID: 2002550
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1709839392307272 3.4291e-08  
a 3.191525411911523 1.7978e-08 au
q 2.645825824827921 1.0841e-07 au
i 10.39256914592117 4.1083e-06 deg
node 158.4999728799669 2.0527e-05 deg
peri 242.922604379002 2.3492e-05 deg
M 156.3330161662766 1.2825e-05 deg
tp 2457696.134277686192
(2016-Nov-03.63427769)
7.1902e-05 TDB
period 2082.552157035664
5.70
1.7597e-05
4.818e-08
d
yr
n .1728648181913626 1.4607e-09 deg/d
Q 3.737224998995124 2.1052e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2186  
   data-arc span      17788 days (48.70 yr)  
   first obs. used      1970-08-28  
   last obs. used      2019-05-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43774  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-29 21:35:26  

Additional Information
 Earth MOID = 1.67253 au 
 Jupiter MOID = 1.80532 au 
 T_jup = 3.148 
[ 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 11.5   n/a MPO302076  
diameter diameter 22.379 km 0.228 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 9.78916 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 sidereal period (not synodic); Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Durech, J.; Hanus, J.; Ali-Lagoa, V. (2018) Astron. Astrophys. 617, A57.]
geometric albedo albedo 0.105   0.015 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

2550 Houssay (1976 UP20)          Discovered 1976-Oct-21 by Felix Aguilar Observatory at El Leoncito
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1976 UP20 = 1970 QT = 1970 RV 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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