1999 GB21

1999GB21, 1989 SN, 1989SN, 49630, J89S00N, J99G21B

All data for this body: [vot]

MPC data
Name (number) 1999 GB21 (49630)
a 3.19548
e 0.11789
i / sin(i) 24.7336 / 0.41840
q 2.81875
Q 3.57220
ω 123.4778
Node 47.3077
m 228.6786
n 0.1725
Epoch 2460800.5
nobs 4048
nopp 23
Years observed 1989-2025
rms 0.61
Best values
[raw, vot]

Value Standard error
Parent
 
ap 3.208
ep 0.120
sin(ip) 0.402
G 0.150
H 12.630
Mass
D 21.50 0.078
pV 0.045 0.0049
Value
Rotational Period 78.900
Period quality 2
Spectral Class None
Spectral Class Score
Proper elements data
[raw, vot]

ap ep sin(ip) Author Reference Method
3.2077 0.1202 0.4023 Novakovic_Radovic_Todovic 2003A&A...403.1165K Numeric-Nov-2024
Diameter data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
20.92 0.110 0.110 Masiero 2011ApJ...741...68M NEATM
22.04 0.110 0.110 Masiero 2014ApJ...791..121M NEATM
23.05 6.928 6.928 Masiero 2017AJ....154..168M NEATM
24.93 9.560 9.560 Masiero 2021PSJ.....2..162M NEATM
25.15 5.970 5.970 Nugent 2016AJ....152...63N NEATM
26.07 5.210 5.210 Ali-Lagoa 2018A&A...612A..85A NEATM
26.14 5.230 5.230 Ali-Lagoa 2018A&A...612A..85A NEATM
27.50 1.670 1.670 Usui 2011PASJ...63.1117U NEATM
Albedo data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
0.027 0.0110 0.0110 Ali-Lagoa 2018A&A...612A..85A NEATM
0.027 0.0110 0.0110 Ali-Lagoa 2018A&A...612A..85A NEATM
0.030 0.0200 0.0200 Nugent 2016AJ....152...63N NEATM
0.034 0.0198 0.0198 Masiero 2017AJ....154..168M NEATM
0.034 0.0170 0.0360 Masiero 2021PSJ.....2..162M NEATM
0.060 0.0100 0.0100 Masiero 2014ApJ...791..121M NEATM
0.070 0.0105 0.0105 Masiero 2011ApJ...741...68M NEATM
G data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
0.15 MPC-2023-12-94 MPC-2023-12-94 Phot
H data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
12.63 MPC-2023-12-04 MPC-2023-12-04 Phot
Periods
[raw, vot]

Value Quality Side real or Synodic Author Reference Method
78.94 2 Synodic Waszczak 2015AJ....150...75W Lightcurve