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909 Ulla (A919 CA)
Classification: Outer Main-belt Asteroid          SPK-ID: 2000909
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 108 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09080092444012051 1.8832e-08  
a 3.541794208510936 1.5481e-08 au
q 3.220196020201478 7.1321e-08 au
i 18.7975196133737 2.9204e-07 deg
node 146.3547085651616 3.1924e-06 deg
peri 232.6018671356155 9.7505e-06 deg
M 209.9519561481084 1.0229e-05 deg
tp 2460215.255115361799
(2023-Sep-27.75511536)
7.0551e-05 TDB
period 2434.632482718916
6.67
1.5962e-05
4.37e-08
d
yr
n .1478662601256203 9.6947e-10 deg/d
Q 3.863392396820394 1.6887e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3114  
   data-arc span      37300 days (102.12 yr)  
   first obs. used      1919-02-08  
   last obs. used      2021-03-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .40199  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 18:59:39  

Additional Information
 Earth MOID = 2.25313 au 
 Jupiter MOID = 1.65003 au 
 T_jup = 3.025 
[ 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 8.79   n/a MPCxxxxx IRAS observations used: 11
diameter diameter 116.44 km 2.4 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 11
rotation period rot_per 8.7155 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Gonano, M.; Di Martino, M.; Mottola, S.; Neukum, G. (1991) Adv. Space Res. 11, no. 12, 197-200.]
[Lagerkvist, C.-I.; Erikson, A.; Lahulla, F.; Di Martino, M.; et al. (2001) Icarus 149, 190-197.]
[Behrend, R. (2002) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2020) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.0343   0.001 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 11
B-V BV 0.689   0.023 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=8.27 deg.
U-B UB 0.279   0.037 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=8.27 deg.
Tholen spectral type spec_T X   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices

909 Ulla (A919 CA)          Discovered 1919-Feb-07 by Reinmuth, K. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A919 CA = 1936 SJ = 1949 OF1 = 1949 PW = 1966 BU = 1966 DM = A912 CA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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