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21805 (1999 TQ9)
Classification: Main-belt Asteroid          SPK-ID: 2021805
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 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1864901745485305 3.8443e-08  
a 3.10146091783959 1.5062e-08 au
q 2.523068929916239 1.2326e-07 au
i .72297054842949 4.0548e-06 deg
node 191.3541794867327 0.00029584 deg
peri 194.8849238572219 0.00029602 deg
M 357.3980352817708 1.2188e-05 deg
tp 2459410.919387028939
(2021-Jul-15.41938703)
6.76e-05 TDB
period 1995.022950945719
5.46
1.4533e-05
3.979e-08
d
yr
n .1804490518915313 1.3145e-09 deg/d
Q 3.679852905762941 1.787e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1737  
   data-arc span      11515 days (31.53 yr)  
   first obs. used      1989-12-30  
   last obs. used      2021-07-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50493  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 15:03:01  

Additional Information
 Earth MOID = 1.52667 au 
 Jupiter MOID = 1.77513 au 
 T_jup = 3.195 
[ 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 13.61   n/a E2021B10  
diameter diameter 8.173 km 2.789 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  
rotation period rot_per 309.294 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.]
geometric albedo albedo 0.096   0.075 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  

21805 (1999 TQ9)          Discovered 1999-Oct-08 by Korlevic, K., Juric, M. at Visnjan
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ 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
1959-May-29 08:37 00:01 Jupiter 1.81775102661571 1.81775058882438 1.81775146440684 1.91909229751444 1.65860473690245 2436717.858991328 1.27541103212619 55.7879688080292 18.8531835441352 86.4358917085496 2378084.73330213 T 29 CATAB v2.0g-lin.ifort 2021-Aug-25 15:03:08 2021-Aug-25 15:03
1969-May-13 01:09 00:01 Jupiter 1.83265845374033 1.83265795115235 1.83265895632842 1.80038488802737 1.52217637408611 2440354.547745644 1.00651420627347 81.9579715642671 24.1473802228581 -75.1328436586705 2564312.64823658 T 29 CATAB v2.0g-lin.ifort 2021-Aug-25 15:03:08 2021-Aug-25 15:03
2030-Feb-09 07:06 < 00:01 Jupiter 1.76826486817273 1.76826453246051 1.76826520388465 1.66475592455094 1.34662004703314 2462541.796051465 0.39480134365786 61.591071138933 43.0800624005361 -75.9700431915146 2509560.04309886 T 29 CATAB v2.0g-lin.ifort 2021-Aug-25 15:03:08 2021-Aug-25 15:03
2040-Jan-26 01:04 < 00:01 Jupiter 1.91616017965071 1.91615978043283 1.91616057886858 2.1546177609245 1.9386321198861 2466179.544692127 0.645513275849064 51.5379552349861 3.92549156664669 86.6491295440377 2976919.28538734 T 29 CATAB v2.0g-lin.ifort 2021-Aug-25 15:03:08 2021-Aug-25 15:03
2090-Nov-10 06:35 00:02 Jupiter 1.93103099997271 1.93103040269084 1.93103159725436 2.60616238696776 2.43203772378356 2484730.774375585 1.71036969178227 38.9721482575558 9.05277344740037 -86.6199722857949 1743863.63600901 T 29 CATAB v2.0g-lin.ifort 2021-Aug-25 15:03:08 2021-Aug-25 15:03
2100-Oct-25 00:29 00:02 Jupiter 1.76186098352496 1.76186063333381 1.76186133371582 1.58803419505515 1.24913718271354 2488366.520405331 1.97820602894783 101.045432883273 59.2727974437211 89.4099367386031 2422372.2526597 T 29 CATAB v2.0g-lin.ifort 2021-Aug-25 15:03:08 2021-Aug-25 15:03
2161-Jul-26 22:30 00:03 Jupiter 1.8419890166206 1.84198810403699 1.84198992920358 2.10632809372342 1.87534945035546 2510556.437665301 3.35028471788614 67.6827944094618 17.2447028540362 75.5976689801297 1423142.63889853 T 29 CATAB v2.0g-lin.ifort 2021-Aug-25 15:03:08 2021-Aug-25 15:03
2171-Jul-10 13:04 00:04 Jupiter 1.79877384432675 1.79877311377682 1.79877457488025 1.68937782126136 1.38283034491358 2514192.044303373 3.59661940902532 184.810847968696 35.2344522770989 -80.3907591443863 2604581.72486789 T 29 CATAB v2.0g-lin.ifort 2021-Aug-25 15:03:08 2021-Aug-25 15:03

Alternate Designations
 1999 TQ9 = 1989 YZ3 = 1997 HX8 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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