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48727 (1997 AL18)
Classification: Main-belt Asteroid          SPK-ID: 2048727
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1074062956452885 3.7667e-08  
a 2.27239481172645 8.9316e-09 au
q 2.028325302755339 8.4197e-08 au
i 10.1689900017722 4.2873e-06 deg
node 111.2598528806922 2.4062e-05 deg
peri 180.4376382994396 3.2084e-05 deg
M 130.2673870809201 2.0943e-05 deg
tp 2458547.751195978429
(2019-Mar-05.25119598)
7.2482e-05 TDB
period 1251.192436572931
3.43
7.3767e-06
2.02e-08
d
yr
n .2877255244493446 1.6963e-09 deg/d
Q 2.516464320697561 9.8909e-09 au
  Orbit Determination Parameters
   # obs. used (total)      896  
   data-arc span      8673 days (23.75 yr)  
   first obs. used      1997-01-15  
   last obs. used      2020-10-14  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51541  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 23:36:02  

Additional Information
 Earth MOID = 1.01211 au 
 Jupiter MOID = 2.64041 au 
 T_jup = 3.583 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457031.5 (2015-Jan-09.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1074940009889867 3.7542e-08  
q 2.027769133585553 8.3905e-08 au
tp 2457297.742321975100
(2015-Oct-02.24232198)
7.2317e-05 TDB
node 111.2953570334978 2.4076e-05 deg
peri 180.7169207196779 3.2127e-05 deg
i 10.16647326631918 4.2859e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      896  
   data-arc span      8673 days (23.75 yr)  
   first obs. used      1997-01-15  
   last obs. used      2020-10-14  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51541  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 23:36:02  

Additional Information
 Jupiter MOID = 2.64041 au 
 T_jup = 3.583 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.409379667487891E-15 -3.136311677525198E-15 -5.03876960355177E-13 -7.113811490534336E-15 -1.310575926602288E-13 -2.945163312213117E-15
q -3.136311677525198E-15 7.040089278417574E-15 1.136090157527151E-12 1.574715328710682E-14 2.89929473497861E-13 6.759722019629292E-15
tp -5.03876960355177E-13 1.136090157527151E-12 5.22970470454573E-9 2.346733137913466E-11 1.552833178610628E-9 9.893740129831132E-13
node -7.113811490534336E-15 1.574715328710682E-14 2.346733137913466E-11 5.796757161724358E-10 -5.632319687298376E-10 -2.20175772194246E-11
peri -1.310575926602288E-13 2.89929473497861E-13 1.552833178610628E-9 -5.632319687298376E-10 1.032116031346225E-9 2.188939117831139E-11
i -2.945163312213117E-15 6.759722019629292E-15 9.893740129831132E-13 -2.20175772194246E-11 2.188939117831139E-11 1.836902901259965E-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 15.7   n/a MPO337647  
rotation period rot_per 3.228 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:
[Chang, C.K.; Ip, W.-H.; Lin, H.-W.; Cheng, Y.C.; et al. (2015) Astrophys. J. Supp. Ser. 219, A27.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]

48727 (1997 AL18)          Discovered 1997-Jan-15 by Klet at Klet
Reference: 20021120/Numbers.arcLast Updated: 2004-04-19

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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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