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9121 Stefanovalentini (1998 DJ11)
Classification: Outer Main-belt Asteroid          SPK-ID: 2009121
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 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04229512844434023 1.8019e-08  
a 3.884716105489897 2.7591e-08 au
q 3.720411538838404 6.8633e-08 au
i 4.646920920522627 8.5489e-07 deg
node 326.7966610430021 1.1298e-05 deg
peri 337.8720830517746 2.4575e-05 deg
M 213.7872055824776 2.2847e-05 deg
tp 2460336.348039329184
(2024-Jan-26.84803933)
0.00017881 TDB
period 2796.645093799686
7.66
2.9794e-05
8.157e-08
d
yr
n .1287256651901021 1.3714e-09 deg/d
Q 4.049020672141389 2.8758e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2640  
   data-arc span      16397 days (44.89 yr)  
   first obs. used      1976-05-02  
   last obs. used      2021-03-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .41401  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 00:11:49  

Additional Information
 Earth MOID = 2.70395 au 
 Jupiter MOID = 1.15933 au 
 T_jup = 3.060 
[ 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 11.35   n/a MPCxxxxx  
rotation period rot_per 11.84 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:
[Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]

9121 Stefanovalentini           Discovered 1998 Feb. 24 by V. S. Casulli at the Colleverde di Guidonia.
Stefano Valentini (b. 1955) is an Italian amateur astronomer and able computer programmer well known for his software WinAstrometry, used at many Italian amateur observatories for the calculation of astrometric positions from CCD images. Since 1993 he has collaborated with the observatory where this discovery was made.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20000726/MPCPages.arcLast Updated: 2013-03-29

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Alternate Designations
 1998 DJ11 = 1976 JO9 = 1978 PB2 = 1978 SA4 = 1986 TU8 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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