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JPL Small-Body Database Browser
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1628 Strobel (A923 RT)
Classification: Main-belt Asteroid          SPK-ID: 2001628
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06688755714682862 3.4638e-08  
a 3.010955050042396 1.1881e-08 au
q 2.809559622066153 1.0524e-07 au
i 19.38764896694671 4.2958e-06 deg
node 181.1735014002416 1.1765e-05 deg
peri 288.7383108051472 3.4551e-05 deg
M 73.31667787356162 3.1821e-05 deg
tp 2458611.853185709204
(2019-May-08.35318571)
0.0001687 TDB
period 1908.335963966801
5.22
1.1295e-05
3.092e-08
d
yr
n .1886460281614558 1.1165e-09 deg/d
Q 3.21235047801864 1.2675e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2516  
   data-arc span      35209 days (96.40 yr)  
   first obs. used      1923-09-11  
   last obs. used      2020-02-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43098  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 16:00:11  

Additional Information
 Earth MOID = 1.88273 au 
 Jupiter MOID = 1.89391 au 
 T_jup = 3.160 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456407.5 (2013-Apr-25.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06827647580661925 3.4701e-08  
q 2.806031608434765 1.0588e-07 au
tp 2456712.585276608953
(2014-Feb-24.08527661)
0.00016536 TDB
node 181.311436745135 1.1778e-05 deg
peri 290.5909099100877 3.387e-05 deg
i 19.37432355853189 4.2938e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2516  
   data-arc span      35209 days (96.40 yr)  
   first obs. used      1923-09-11  
   last obs. used      2020-02-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43098  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 16:00:11  

Additional Information
 Jupiter MOID = 1.89391 au 
 T_jup = 3.160 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.204172468116449E-15 -3.654197903269268E-15 3.540395752629194E-13 -7.967815584648589E-16 7.271439683729451E-14 -1.143386085083792E-15
q -3.654197903269268E-15 1.121132220897463E-14 -1.293866746825023E-12 3.096707442430241E-15 -2.689350819272585E-13 3.817151121417011E-15
tp 3.540395752629194E-13 -1.293866746825023E-12 2.734453635451388E-8 -3.297194463573117E-11 5.270293251907433E-9 -3.163508797642949E-12
node -7.967815584648589E-16 3.096707442430241E-15 -3.297194463573117E-11 1.38719822463261E-10 -1.366309283511899E-10 -1.616595592387979E-12
peri 7.271439683729451E-14 -2.689350819272585E-13 5.270293251907433E-9 -1.366309283511899E-10 1.147186006166373E-9 8.491198704995992E-13
i -1.143386085083792E-15 3.817151121417011E-15 -3.163508797642949E-12 -1.616595592387979E-12 8.491198704995992E-13 1.843690027934715E-11

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 10.3   n/a MPO502169 IRAS observations used: 12
diameter diameter 59.345 km 0.484 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 9.52 h n/a LCDB (Rev. 2019-August); 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. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.047   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.840   0.020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=6.41 deg.
U-B UB 0.320   0.060 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=6.41 deg.

1628 Strobel (A923 RT)          Discovered 1923-Sep-11 by Reinmuth, K. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A923 RT = 1926 GY = 1947 GC = 1949 QA2 = 1952 DV2 = 1957 CA = 1960 WH 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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