Asteroids with Satellites Database--Johnston's Archive
2013 WT44
compiled by Wm. Robert Johnston
last updated
9 October 2021
--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:
NEA, Apollo
(PHA)
orbital data, primary (osculating elements)
[JPL]
: |
semimajor axis a: |
2.259906481 AU
| |
orbital period P: |
3.39737826 yr
(= 1240.892411 d)
| |
eccentricity e: |
0.568187098
| |
perihelion distance q: |
0.975856776 AU
| |
aphelion distance Q: |
3.54395619 AU
| |
inclination i: |
12.2060148°
| |
argument of perihelion ω: |
325.794417°
| |
ascending node Ω: |
182.7280864°
| |
mean anomaly M: |
59.019493°
| |
perihelion passage TP: |
2020 Dec 09.56433
| |
Epoch: |
2021 Jul 01
| |
data arc: |
2013-2020
(533 obs.)
| |
Earth MOID: |
0.033589 AU
| |
Jupiter Tisserand invariant TJ: |
3.363
|
orbital data, secondary:
|
semimajor axis as: |
?
| |
orbital period Ps: |
?
| |
eccentricity es: |
?
| |
normalized ang. mom. αL: |
?
|
|
other data, system (combined):
|
absolute mag. H: |
19.3
[MPC]
| |
slope parameter G: |
(0.15) [*A]
| |
effective diameter dE: |
1.32
± 0.11
km [M14b]
| |
geometric albedo: |
0.019
± 0.004
[M14b]
| |
color index U-B: |
?
| |
color index B-V: |
?
| |
taxonomic type: |
?
| |
mass m: |
?
| |
density ρ: |
(1.6
g/cm3) [*A]
| |
Hill radius rH: |
76 km [*E]
|
other data, primary:
|
diameter dp: |
1
± 0.1
km [B14b]
| |
rotation period RPp: |
2.8849
± 0.0006
h [W14e]
| |
amplitude in mag., rotational ΔM: |
0.05
[W14e]
| |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
|
diameter ds: |
0.25
km [*E]
| |
diameter ratio ds/dp: |
0.25
[*E]
| |
component mag. difference ΔM: |
3.01
[*E]
| |
rotation period RPs: |
?
| |
|
|
--
2013 WT44
--discovery and notes:
Primary discovered
2013 Nov 27
from
Catalina Station, Arizona, USA
by
Catalina Sky Survey.
Companion discovered
2014 Mar 20
using
radar
observations from Goldstone Observatory, California, USA; Arecibo Observatory, Puerto Rico.
Announced
2014 Mar 22.
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
©
2014, 2021
by Wm. Robert Johnston.
Last modified
9 October 2021.
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