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1561 Fricke (1941 CG)
Classification: Main-belt Asteroid          SPK-ID: 2001561
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 43 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1266491945916348 1.5063e-08  
a 3.196652328047794 1.178e-08 au
q 2.791798885311067 5.1471e-08 au
i 4.319592207125207 3.1717e-07 deg
node 230.6402330625799 5.2996e-06 deg
peri 41.66199512447913 1.0277e-05 deg
M 311.5458062085631 5.9845e-06 deg
tp 2459677.476762850902
(2022-Apr-07.97676285)
3.4751e-05 TDB
period 2087.572338149207
5.72
1.154e-05
3.159e-08
d
yr
n .1724491139402468 9.5327e-10 deg/d
Q 3.601505770784521 1.3272e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3588  
   data-arc span      29388 days (80.46 yr)  
   first obs. used      1941-02-15  
   last obs. used      2021-08-02  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42218  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 07:50:01  

Additional Information
 Earth MOID = 1.77744 au 
 Jupiter MOID = 1.49653 au 
 T_jup = 3.178 
[ 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 11.51   n/a MPO636085  
diameter diameter 25.352 km 0.098 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 15.15330 h n/a LCDB (Rev. 2020-October); 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.; Oszkiewsicz, D.; Vanco, R. (2016) Astron. Astrophys. 587, A48.]
geometric albedo albedo 0.063   0.011 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

1561 Fricke (1941 CG)          Discovered 1941-Feb-15 by Reinmuth, K. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1904-Nov-08 07:10 00:02 Jupiter 1.63111288208829 1.63111220036565 1.63111356381158 2.29397092485409 2.05516915878039 2416792.798578218 1.50770257946141 65.9633010459442 2.08710746717324 -77.4898024136726 7956101.87240752 T 43 CATAB v2.0g-lin.ifort 2021-Aug-25 07:51:50 2021-Aug-25 07:51
1915-Aug-25 21:36 00:01 Jupiter 1.95259636769386 1.95259561359856 1.95259712178983 3.53572588769006 3.41083152338509 2420735.399792877 1.36221528468999 66.9147590461722 5.90942925606325 -63.9650870507616 8862354.08523934 T 43 CATAB v2.0g-lin.ifort 2021-Aug-25 07:51:50 2021-Aug-25 07:51
2002-Nov-01 13:43 < 00:01 Jupiter 1.84761681327979 1.8476165633545 1.84761706320508 2.30378420118445 2.09536166305842 2452580.071767148 0.235165959734184 8.72676515399472 2.44285567448956 -65.9224777961866 6135078.526602 T 43 CATAB v2.0g-lin.ifort 2021-Aug-25 07:51:50 2021-Aug-25 07:51
2013-Sep-12 17:42 < 00:01 Jupiter 1.57106957187168 1.57106936968377 1.57106977405951 1.83458855888801 1.51242857462951 2456548.237824832 0.144444468757774 9.94295685670259 4.30410304731279 -70.4766318871204 8500855.9226933 T 43 CATAB v2.0g-lin.ifort 2021-Aug-25 07:51:50 2021-Aug-25 07:51
2024-Aug-13 22:51 < 00:01 Jupiter 1.48208152369892 1.48208141395886 1.4820816334389 1.92076950346423 1.59572492931786 2460536.451746665 0.273769000540334 18.3372827416551 3.20498753266486 -83.8771685818167 11207357.2306041 T 43 CATAB v2.0g-lin.ifort 2021-Aug-25 07:51:50 2021-Aug-25 07:51
2035-Jun-30 23:06 < 00:01 Jupiter 1.64323252657831 1.64323218625796 1.64323286689866 2.40613031130401 2.18140798461623 2464509.462188010 0.516865667544452 24.6839789392078 2.02937537204493 -70.4381794659584 8165492.89433487 T 43 CATAB v2.0g-lin.ifort 2021-Aug-25 07:51:50 2021-Aug-25 07:51
2046-Apr-19 01:38 < 00:01 Jupiter 1.96287980009939 1.96287927248222 1.96288032771667 3.64762911970752 3.52734426494301 2468454.568356181 0.705574137464699 37.6465975986663 5.03785720684047 -55.8401741515154 9657981.48787085 T 43 CATAB v2.0g-lin.ifort 2021-Aug-25 07:51:50 2021-Aug-25 07:51
2133-Jul-05 23:55 00:02 Jupiter 1.85678209658058 1.85678102031311 1.85678317284806 2.24544495265315 2.03215838858016 2500308.496285893 1.79566603052949 63.0789755579881 1.79776191241162 -72.4182978381725 6027715.49507265 T 43 CATAB v2.0g-lin.ifort 2021-Aug-25 07:51:50 2021-Aug-25 07:51
2144-May-17 06:12 00:02 Jupiter 1.59090139841455 1.59090061815417 1.59090217867466 1.76593648471811 1.4330729986927 2504276.758442198 1.89525512993107 23.9560808521057 9.22453722133583 1.06982638016807 4138602.59169004 T 43 CATAB v2.0g-lin.ifort 2021-Aug-25 07:51:50 2021-Aug-25 07:51
2155-Apr-17 20:18 00:02 Jupiter 1.49875048670703 1.49875032632662 1.49875064708829 1.91534175738396 1.59318208168597 2508264.345944350 2.05733814204222 94.3880890752631 5.30975558677402 76.7995540898696 8885398.93524105 T 43 CATAB v2.0g-lin.ifort 2021-Aug-25 07:51:50 2021-Aug-25 07:51
2166-Mar-04 18:14 00:02 Jupiter 1.64858688706398 1.64858569620463 1.64858807792549 2.47782410461433 2.26098171005035 2512238.259769578 2.44737712847877 119.538866699187 2.66978827144802 -75.5725135263288 8554645.48498538 T 43 CATAB v2.0g-lin.ifort 2021-Aug-25 07:51:50 2021-Aug-25 07:51
2176-Dec-26 20:37 00:03 Jupiter 1.9536101540779 1.9536085176668 1.95361179049167 3.68575181803157 3.56617874036882 2516188.358967758 2.69220019626898 143.36485182546 5.90097201684912 -61.9328977289027 9091096.97181373 T 43 CATAB v2.0g-lin.ifort 2021-Aug-25 07:51:50 2021-Aug-25 07:51

Alternate Designations
 1941 CG = 1970 HE = A915 RO 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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