Asteroids with Satellites Database--Johnston's Archive
(38079)
1999 HF
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: |
2.3239710619 AU
| |
orbital period P: |
3.5427954143 yr
(= 1294.0304644 d)
| |
eccentricity e: |
0.191858478
| |
perihelion distance q: |
1.87809751 AU
| |
aphelion distance Q: |
2.769844614 AU
| |
inclination i: |
24.1393873°
| |
argument of perihelion ω: |
2.868655°
| |
ascending node Ω: |
182.2930465°
| |
mean anomaly M: |
16.4959645°
| |
perihelion passage TP: |
2020 Apr 01.704776
| |
Epoch: |
2020 May 31
| |
data arc: |
1993-2020
(1663 obs.)
| |
Earth MOID: |
0.880853 AU
| |
Jupiter Tisserand invariant TJ: |
3.436
|
orbital data, secondary:
|
semimajor axis as: |
5.9
km
[*E]
| |
separation/primary radius as/rp: | 3.5 [*E] | |
separation/Hill radius as/rH: | 0.012 [*E] | |
orbital period Ps: |
0.6948
± 0.0004
d [B20f]
| |
eccentricity es: |
?
| |
normalized ang. mom. αL: |
?
|
|
other data, system (combined):
|
absolute mag. H: |
14.3
[MPC]
| |
slope parameter G: |
(0.15) [*A]
| |
effective diameter dE: |
3.42
± 0.12
km [M11b]
| |
geometric albedo: |
0.287
± 0.070
[M11b]
| |
color index U-B: |
?
| |
color index B-V: |
?
| |
taxonomic type: |
?
| |
mass m: |
?
| |
density ρ: |
(1.6
g/cm3) [*A]
| |
Hill radius rH: |
500 km [*E]
|
other data, primary:
|
diameter dp: |
3.42
± 0.12
km [M11b]
| |
rotation period RPp: |
16.675
h [W20b]
| |
amplitude in mag., rotational ΔM: |
0.42
[W20b]
| |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
|
diameter ds: |
?
| |
diameter ratio ds/dp: |
?
| |
component mag. difference ΔM: |
?
| |
rotation period RPs: |
?
| |
|
|
--
(38079) 1999 HF
--discovery and notes:
Primary discovered
1999 Aor 16
from
Xinglong, PR China
by
BAO Schmidt CCD Asteroid Program.
Alternate designation(s):
1993 SY7.
Linked to prediscovery observations from 1993 Sep 17.
Permanent number assigned 2002 Mar 28.
Companion discovered
2020
using
lightcurve
observations.
Announced
2020 Jun 11.
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
©
2020-2021, 2022
by Wm. Robert Johnston.
Last modified
30 April 2022.
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