Asteroids with Satellites Database--Johnston's Archive
(3390)
Demanet
compiled by Wm. Robert Johnston
last updated
30 April 2022
--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:
main belt asteroid
orbital data, primary (osculating elements)
[JPL]
: |
semimajor axis a: |
2.253140014 AU
| |
orbital period P: |
3.382067496 yr
(= 1235.3234835 d)
| |
eccentricity e: |
0.114882312
| |
perihelion distance q: |
1.99429408 AU
| |
aphelion distance Q: |
2.5119859484 AU
| |
inclination i: |
3.3886456°
| |
argument of perihelion ω: |
259.617379°
| |
ascending node Ω: |
342.81966°
| |
mean anomaly M: |
261.1106422°
| |
perihelion passage TP: |
2021 Nov 21.334294
| |
Epoch: |
2020 Dec 17
| |
data arc: |
1977-2021
(3126 obs.)
| |
Earth MOID: |
0.983443 AU
| |
Jupiter Tisserand invariant TJ: |
3.614
|
orbital data, secondary:
|
semimajor axis as: |
14
km
[*E]
| |
separation/primary radius as/rp: | 5.7 [*E] | |
separation/Hill radius as/rH: | 0.018 [*E] | |
orbital period Ps: |
1.5475
± 0.0004
d [B21b]
| |
eccentricity es: |
?
| |
normalized ang. mom. αL: |
?
|
|
other data, system (combined):
|
absolute mag. H: |
13.33
[MPC]
| |
slope parameter G: |
(0.15) [*A]
| |
effective diameter dE: |
5.06
± 0.26
km [M11b]
| |
geometric albedo: |
0.274
± 0.032
[M11b]
| |
color index U-B: |
?
| |
color index B-V: |
?
| |
taxonomic type: |
?
| |
mass m: |
?
| |
density ρ: |
(1.6
g/cm3) [*A]
| |
Hill radius rH: |
760 km [*E]
|
other data, primary:
|
diameter dp: |
4.9
± 0.25
km [*D]
| |
rotation period RPp: |
2.59457
± 0.00003
h [B21b]
| |
amplitude in mag., rotational ΔM: |
0.18
[B21b]
| |
amplitude in mag., mutual events ΔM: | 0.105 ±0.035 [B21b] | |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
|
diameter ds: |
1.27
± 0.12
km [*D]
| |
diameter ratio ds/dp: |
0.26
± 0.02
[B21b]
| |
component mag. difference ΔM: |
2.93
± 0.17
[*D]
| |
rotation period RPs: |
?
| |
|
|
--
(3390) Demanet
--discovery and notes:
Primary discovered
1984 Mar 02
from
La Silla, Chile
by
H. Debehogne.
Alternate designation(s):
1984 ES1,
1977 ED, 1978 QQ, 1982 UF11.
Linked to prediscovery observations from 1977 Mar 09.
Permanent number assigned 1986 Jan 26.
Named 1989 Dec 12 for the Demanet family name [MPC015573].
Companion discovered
by Benishek, V. P. Pravec, and R. Durkee
using
lightcurve
observations.
Announced
2021 Apr 24 [B21b].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
©
2021, 2022
by Wm. Robert Johnston.
Last modified
30 April 2022.
Return to Home. Return to Astronomy and Space. Return to Asteroids with Satellites.