Asteroids with Satellites Database--Johnston's Archive
(16974)
Iphthime
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:
Jupiter trojan asteroid, L4
orbital data, primary (osculating elements)
[JPL]
: |
semimajor axis a: |
5.19017267 AU
| |
orbital period P: |
11.82422567 yr (= 4318.879999 d)
| |
eccentricity e: |
0.070401721
| |
perihelion distance q: |
4.82477558 AU
| |
aphelion distance Q: |
5.55556977 AU
| |
inclination i: |
15.036372°
| |
argument of perihelion ω: |
134.715771°
| |
ascending node Ω: |
241.559536°
| |
mean anomaly M: |
261.735542°
| |
perihelion passage TP: |
2021 Jun 13.86778
| |
Epoch: |
2018 Mar 23
| |
data arc: |
1974-2017
(1073 obs.)
| |
Earth MOID: |
3.8459 AU
| |
Jupiter Tisserand invariant TJ: |
2.927
|
orbital data, secondary:
|
semimajor axis as: |
179
± 10 km
[*D]
| |
separation/primary radius as/rp: | 7.9 [*D] | |
separation/Hill radius as/rH: | 0.0093 [*E] | |
orbital period Ps: |
3.29
d [*A]
| |
eccentricity es: |
?
| |
normalized ang. mom. αL: |
?
|
|
other data, system (combined):
|
absolute mag. H: |
9.8
[MPC]
| |
slope parameter G: |
(0.15) [*A]
| |
effective diameter dE: |
57.34
± 0.33
km [G12d]
| |
geometric albedo: |
0.065
± 0.010
[G12d]
| |
color index U-B: |
?
| |
color index B-V: |
?
| |
taxonomic type: |
?
| |
mass m: |
?
| |
density ρ: |
(1.6
g/cm3) [*A]
| |
Hill radius rH: |
19000 km [*E]
|
other data, primary:
|
diameter dp: |
45.5
± 3.3
km [*D]
| |
rotation period RPp: |
78.9
± 0.4
h [M11e]
| |
amplitude in mag., rotational ΔM: |
?
| |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
|
diameter ds: |
34.9
± 5.44
km [*D]
| |
diameter ratio ds/dp: |
0.767
± 0.119
[*D]
| |
component mag. difference ΔM: |
0.6
± 0.3
[*D]
| |
rotation period RPs: |
?
| |
|
|
--
(16974) Iphthime
--discovery and notes:
Primary discovered
1998 Nov 18
from
Socorro, New Mexico, USA
by
LINEAR Program.
Alternate designation(s):
1998 WR21,
1974 WX, 1986 WS.
Linked to prediscovery observations from 1974 Nov 18.
Permanent number assigned 2000 Sep 13.
Named 2017 Dec 03 for the mythological sister of Penelope [MPC107739].
Companion discovered
2013 Mar 13
using
Hubble Space Telescope
observations.
Announced
2016 Mar.
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
©
2018-2019, 2022
by Wm. Robert Johnston.
Last modified
30 April 2022.
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