1999 XQ221
1999XQ221, 2001 DW74, 2001DW74, 49957, J99XM1Q, K01D74W
All data for this body: [vot]
MPC data
| Name (number) |
1999 XQ221 (49957) |
| a |
2.56532 |
| e |
0.19079 |
| i / sin(i) |
5.7323 /
0.09988
|
| q |
2.07588
|
| Q |
3.05475
|
| ω |
168.2719 |
| Node |
37.6449 |
| m |
173.5615 |
| n |
0.2399 |
| Epoch |
2460200.5 |
| nobs |
2428 |
| nopp |
20 |
| Years observed |
1998-2023 |
| rms |
0.65 |
Best values
|
Value |
Standard error |
| Parent |
|
|
| |
|
|
| ap |
2.565 |
|
| ep |
0.222 |
|
| sin(ip) |
0.088 |
|
|
Value |
Standard error |
| G |
0.150 |
|
| H |
14.850 |
|
| Mass |
|
|
| D |
3.20 |
0.603 |
| pV |
0.227 |
0.0694 |
| Rotational Period |
|
Proper elements data
| ap |
ep |
sin(ip) |
Author |
Reference |
Method |
| 2.5648 |
0.2217 |
0.0880 |
Novakovic_Radovic_Todovic |
2003A&A...403.1165K |
Numeric-Oct-2022 |
Diameter data
| Value |
Uncertainty up |
Uncertainty down |
Author |
Reference |
Method |
| 3.20 |
0.603 |
0.603 |
Masiero |
2011ApJ...741...68M |
NEATM |
Albedo data
| Value |
Uncertainty up |
Uncertainty down |
Author |
Reference |
Method |
| 0.227 |
0.0694 |
0.0694 |
Masiero |
2011ApJ...741...68M |
NEATM |
G data
| Value |
Uncertainty up |
Uncertainty down |
Author |
Reference |
Method |
| 0.15 |
|
|
MPC-2023-12-94 |
MPC-2023-12-94 |
Phot |
H data
| Value |
Uncertainty up |
Uncertainty down |
Author |
Reference |
Method |
| 14.85 |
|
|
MPC-2023-12-04 |
MPC-2023-12-04 |
Phot |