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21615 Guardamano (1999 JQ76)
Classification: Main-belt Asteroid          SPK-ID: 2021615
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .071562176912076 2.8924e-08  
a 2.286250863437618 7.4184e-09 au
q 2.122641774682908 6.5331e-08 au
i 6.131274178378145 3.7293e-06 deg
node 166.9061060439744 3.0446e-05 deg
peri 100.0453843730753 4.0739e-05 deg
M 67.4893703372379 2.6895e-05 deg
tp 2458963.789716192344
(2020-Apr-24.28971619)
9.4352e-05 TDB
period 1262.653685238751
3.46
6.1456e-06
1.683e-08
d
yr
n .285113807696153 1.3877e-09 deg/d
Q 2.449859952192327 7.9493e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1495  
   data-arc span      9945 days (27.23 yr)  
   first obs. used      1993-10-20  
   last obs. used      2021-01-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5135  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:50:29  

Additional Information
 Earth MOID = 1.11546 au 
 Jupiter MOID = 2.59613 au 
 T_jup = 3.591 
[ 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 15.4   n/a MPO384939  
diameter diameter 1.784 km 0.231 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 2.964 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
[Erasmus, N.; McNeill, A.; Mommert, N.; Trilling, D.E.; et al. (2019) Ap. J. Suppl. Series 242, A15.]
geometric albedo albedo 0.265   0.028 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21615 Guardamano           Discovered 1999 May 10 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Andrew Lacson Guardamano (b. 1986) was awarded second place in the 2005 Intel International Science and Engineering Fair for his medicine and health team project. He attends the Archbishop MacDonald High School, Edmonton, Alberta, Canada.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20050822/MPCPages.arcLast Updated: 2005-08-26

[ show close-approach data ]
Alternate Designations
 1999 JQ76 = 1993 UQ7 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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