Asteroids with Satellites Database--Johnston's Archive
(1934)
Jeffers
compiled by Wm. Robert Johnston
last updated
22 February 2025
--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: |
2.39048333627 AU
| |
orbital period P: |
3.6960410258 yr
(= 1349.97898468 d)
| |
eccentricity e: |
0.29948426121
| |
perihelion distance q: |
1.6745712004 AU
| |
aphelion distance Q: |
3.1063954722 AU
| |
inclination i: |
23.152796166°
| |
argument of perihelion ω: |
294.85302089°
| |
ascending node Ω: |
86.466304142°
| |
mean anomaly M: |
41.83990581°
| |
perihelion passage TP: |
2024 May 13.1027956
| |
Epoch: |
2024 Oct 17
| |
data arc: |
1961-2023
(7051 obs.)
| |
Earth MOID: |
0.794495 AU
| |
Jupiter Tisserand invariant TJ: |
3.366
|
orbital data, secondary:
|
semimajor axis as: |
27
km
[*E]
| |
separation/primary radius as/rp: | 6.1 [*E] | |
separation/Hill radius as/rH: | 0.021 [*E] | |
orbital period Ps: |
1.4396
± 0.0008
d [P25a]
| |
eccentricity es: |
?
| |
normalized ang. mom. αL: |
?
|
|
other data, system (combined):
|
absolute mag. H: |
12.65
[MPC]
| |
slope parameter G: |
0.24 [P25a]
| |
effective diameter dE: |
9.24
± 0.1
km [M14c]
| |
geometric albedo: |
0.245
± 0.047
[M14c]
| |
color index U-B: |
?
| |
color index B-V: |
?
| |
taxonomic type: |
S (SMASSII) [X95a]
| |
mass m: |
?
| |
density ρ: |
(2
g/cm3) [*A]
| |
Hill radius rH: |
1200 km [*E]
|
other data, primary:
|
diameter dp: |
8.77
± 0.09
km [*D]
| |
axial ratios a/b, b/c: | 1.10662378397767, ? [*E] | |
rotation period RPp: |
6.045
± 0.0006
h [P25a]
| |
amplitude in mag., rotational ΔM: |
0.11
[P25a]
| |
amplitude in mag., mutual events ΔM: | 0.11 [P25a] | |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
|
diameter ds: |
2.90
± 0.18
km [*D]
| |
axial ratios a/b, b/c: | 1.7;? [P25a] | |
diameter ratio ds/dp: |
0.33
± 0.02
[P25a]
| |
component mag. difference ΔM: |
2.41
± 0.13
[*D]
| |
rotation period RPs: |
34.55
± 0.02
h [P25a]
| |
|
|
--
(1934) Jeffers
--discovery and notes:
Primary discovered
1972 Dec 02
from
Lick Observatory, Mount Hamilton, California, USA
by
A. R. Klemola.
Alternate designation(s):
1972 XB,
1951 AN1, 1961 YA, 2019 GT25.
Linked to prediscovery observations from 1961 Dec 31.
Permanent number assigned -.
Named 1976 Feb 20 for Hamilton M. Jeffers (1893-1976) [MPC003938].
Companion discovered
2020 Dec 07
by P. Pravec, A. Marchini, et al.
using
lightcurve
observations from Astronomical Observatory of the University of Siena, Italy; Sugarloaf Mountain Observatory, South Deerfield, Massachusetts, USA; Skalnate Pleso Observatory, Slovakia; Shed of Science South Observatory, Pontotoc, Texas, USA; Blue Mountains Observatory, Leura, New South Wales, Australia.
Announced
2021 Jan 11 [P21h].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
©
2021-2022, 2025
by Wm. Robert Johnston.
Last modified
22 February 2025.
Return to Home. Return to Astronomy and Space. Return to Asteroids with Satellites.