2001 US21

2001US21, I2596, K01U21S

All data for this body: [vot]

MPC data

Name (number)	2001 US21 (182596)
a	1.90487
e	0.08808
i / sin(i)	20.4932 / 0.35010
q	1.73710
Q	2.07264
ω	198.0853
Node	214.7196
m	312.5093
n	0.3749
Epoch	2460800.5

n_obs	1285
n_opp	15
Years observed	1995-2025
rms	0.73

Best values

	Value	Standard error
Parent	Hungaria (434)

a_p	1.905
e_p	0.079
sin(i_p)	0.357
G	0.150
H	16.480
Mass
D
pV

	Value
Rotational Period
Period quality	None
Spectral Class	X
Spectral Class Score	4.623

Family data

Parent	Parent name	Family ID	Family name	C_j	Author	Reference	Method
434	Hungaria	0	Hungaria		Novakovic	2019EPSC...13.1671N	HCM
434	Hungaria	3	Hungaria	-0.7500	Nesvorny	doi.org/10.26033/6cg5-pt13	HCM-2020-08-14

Proper elements data

a_p	e_p	sin(i_p)	Author	Reference	Method
1.9050	0.0790	0.3571	Novakovic_Radovic_Todovic	2003A&A...403.1165K	Numeric-Nov-2024

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
16.48			MPC-2023-12-04	MPC-2023-12-04	Phot

Spectral Class Data

Class 1	Class 2	Probability of Class 1	Probability of Class 2	Taxonomy	Wavelength	Author	Reference	Method
C	X	0.0215	0.1470	Bus-Demeo	VIS	Sergeyev	2021A&A...652A..59S	PHOT
C	X	0.0384	0.1470	Bus-Demeo	VIS	Sergeyev	2021A&A...652A..59S	PHOT
C	X	0.0453	0.1470	Bus-Demeo	VIS	Sergeyev	2021A&A...652A..59S	PHOT
C	X	0.0690	0.1470	Bus-Demeo	VIS	Sergeyev	2021A&A...652A..59S	PHOT
C	X	0.0698	0.1470	Bus-Demeo	VIS	Sergeyev	2021A&A...652A..59S	PHOT
C	X	0.1772	0.1470	Bus-Demeo	VIS	Sergeyev	2021A&A...652A..59S	PHOT
S	X	0.0393	0.1470	Bus-Demeo	VIS	Sergeyev	2021A&A...652A..59S	PHOT
S	X	0.2380	0.1470	Bus-Demeo	VIS	Sergeyev	2021A&A...652A..59S	PHOT
V	X	0.0557	0.1470	Bus-Demeo	VIS	Sergeyev	2021A&A...652A..59S	PHOT
X	X	0.1244	0.1470	Bus-Demeo	VIS	Sergeyev	2021A&A...652A..59S	PHOT
X	X	0.2754	0.1470	Bus-Demeo	VIS	Sergeyev	2021A&A...652A..59S	PHOT
X	X	0.3707	0.1470	Bus-Demeo	VIS	Sergeyev	2021A&A...652A..59S	PHOT