Asteroids with Satellites Database--Johnston's Archive
(612578)
2003 QR91
compiled by Wm. Robert Johnston
last updated
26 July 2026
--Orbital and physical data--
(See this page for definitions of quantities; source codes in brackets, see this link for full references; *A, *D, and *E indicate assumed, derived, and estimated values, respectively.)
dynamical type, primary:
TNO, Cubewano
orbital data, primary (osculating elements)
[JPL]
: |
semimajor axis a: |
46.7232 AU
| |
orbital period P: |
319.379 yr
(= 116653.2 d)
| |
eccentricity e: |
0.182605
| |
perihelion distance q: |
38.19126 AU
| |
aphelion distance Q: |
55.2551 AU
| |
inclination i: |
3.494745°
| |
argument of perihelion ω: |
14.536°
| |
ascending node Ω: |
273.323°
| |
mean anomaly M: |
40.8046°
| |
perihelion passage TP: |
1988 Aug 04.8
| |
Epoch: |
2024 Oct 17
| |
data arc: |
2003-2020
(125 obs.)
| |
Earth MOID: |
37.1757 AU
| |
Jupiter Tisserand invariant TJ: |
5.993
|
| Neptune Tisserand invariant TN: | 3.090 [*D] |
orbital data, secondary:
|
semimajor axis as: |
1336
km
[E20a]
| |
separation/primary radius as/rp: | 13 [*E] | |
separation/Hill radius as/rH: | 0.0018 [*E] | |
orbital period Ps: |
3.89
d [E20a]
| |
eccentricity es: |
0.600
[E20a]
| |
inclination is: | 57.1 ° [E20a] | |
normalized ang. mom. αL: |
?
|
|
other data, system (combined):
|
absolute mag. H: |
6.66
[MPC]
6.55 ± 0.56 [V14a]
| |
slope parameter G: |
(0.15) [*A]
| |
effective diameter dE: |
280
± 27/30
km [V14a]
| |
geometric albedo: |
0.054
± 0.035/0.028
[V14a]
| |
color index U-B: |
?
| |
color index B-V: |
?
| |
taxonomic type: |
?
| |
mass m: |
1.25x1019
kg [E20a]
| |
density ρ: |
1.5
g/cm3[*D]
| |
Hill radius rH: |
730000 km [*E]
|
other data, primary:
|
diameter dp: |
207
± 21
km [V14a]
| |
rotation period RPp: |
?
| |
amplitude in mag., rotational ΔM: |
?
| |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
|
diameter ds: |
189
± 29
km [V14a]
| |
diameter ratio ds/dp: |
0.912
± 0.103
[N08c]
| |
component mag. difference ΔM: |
0.2
± 0.3
[N08c]
| |
rotation period RPs: |
?
| |
|
|
--
(612578) 2003 QR91
--discovery and notes:
Primary discovered
2003 Aug 24
from
Cerro Tololo Observatory, La Serena, Chile
by
M. W. Buie.
Permanent number assigned 2022 Mar 28.
Companion discovered
2006 Jun 10
by K. S. Noll, et al.
using
Hubble Space Telescope
observations from Hubble Space Telescope.
Announced
2007 Mar 14 [N08c].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
- Noll, Keith S., Grundy, William M., Chiang, Eugene I., Margot, Jean-Luc, & Kern, Susan D. 2007, ArXiv Astrophysics e-prints Binaries in the Kuiper Belt
- Pittichova, J., Meech, K. J., Wasserman, L. H., & Marsden, B. G. 2004, Minor Planet Electronic Circulars 2003 QR91
- Buie, M. W., Wasserman, L. H., Millis, R. L., Kern, S. D., Hutchison, L. E., Qu, J. J., Lundgren, E. W., Gulbisdgren, A. A. S., Kane, J. F., & Marsden, B. G. 2003, Minor Planet Electronic Circulars EIGHT TNOs
©
2007-2022, 2026
by Wm. Robert Johnston.
Last modified
26 July 2026.
Return to Home. Return to Astronomy and Space. Return to Asteroids with Satellites.