Asteroids with Satellites Database--Johnston's Archive
(85938)
1999 DJ4
compiled by Wm. Robert Johnston
last updated
20 September 2014
--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: |
1.853094926 AU
| |
orbital period P: |
2.522636660 yr
(= 921.3930400 d)
| |
eccentricity e: |
0.483304518
| |
perihelion distance q: |
0.957485776 AU
| |
aphelion distance Q: |
2.748704076 AU
| |
inclination i: |
9.1444970°
| |
argument of perihelion ω: |
197.611229°
| |
ascending node Ω: |
19.921951°
| |
mean anomaly M: |
357.5907049°
| |
perihelion passage TP: |
2014 May 29.16641
| |
Epoch: |
2014 May 23
| |
data arc: |
1999-2014
(593 obs.)
| |
Earth MOID: |
0.0225865 AU
| |
Jupiter Tisserand invariant TJ: |
3.84
|
orbital data, secondary:
|
binary dynamical type: | A [P07f] | |
semimajor axis as: |
0.8
km
[*E]
| |
separation/primary radius as/rp: | 3.7 [*E] | |
separation/Hill radius as/rH: | 0.024 [*D] | |
orbital period Ps: |
0.7388
± 0.0004
d [P06b]
| |
eccentricity es: |
?
| |
normalized ang. mom. αL: |
1.35
[P07f]
|
|
other data, system (combined):
|
absolute mag. H: |
18.6
[MPC]
18.49 [JPL]
| |
slope parameter G: |
(0.15) [*A]
| |
effective diameter dE: |
0.48
± 0.09
km [M11c]
| |
geometric albedo: |
0.28
± 0.18
[M11c]
| |
color index U-B: |
?
| |
color index B-V: |
?
| |
taxonomic type: |
Sq (SMASSII) [JPL]
| |
mass m: |
7.46x1010
kg [*D]
| |
density ρ: |
1.6
g/cm3[K10a]
| |
Hill radius rH: |
33 km [*D]
|
other data, primary:
|
diameter dp: |
0.43
± 0.08
km [*D]
| |
rotation period RPp: |
2.514
± 0.000
h [P06b]
| |
amplitude in mag., rotational ΔM: |
?
| |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
|
diameter ds: |
0.21
± 0.05
km [*D]
| |
diameter ratio ds/dp: |
0.5
± 0.05
[P06b]
| |
component mag. difference ΔM: |
1.5
± 0.2
[*D]
| |
rotation period RPs: |
?
| |
|
|
--
(85938) 1999 DJ4
--discovery and notes:
Primary discovered
1999 Feb 24
from
Socorro, New Mexico, USA
by
LINEAR.
Permanent number assigned 2004 Aug 30.
Companion discovered
2004 Feb 21
by P. Pravec, P. Kusnirak, L. Sarounova, P. Brown, N. Kaiser, G. Masi, and F. Mallia
using
lightcurve
observations from Ondrejov Observatory, Czech Republic; Elginfield Observatory, University of Western Ontario, Ontario, Canada; Tenagra II, Nogales, Arizona, USA.
Announced
2004 Apr 23 [P04b].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
- Hergenrother, C. W., Spahr, T. B., & Williams, G. V. 2000, Minor Planet Circulars 1999 DJ4
- Tichy, M., Moravec, Z., Tombelli, M., Boattini, A., Tesi, L., Bartolini, S., Forti, G., Guidetti, D., Masotti, E., Kornos, L., Toth, J., Manca, F., Ghezzi, P., Blythe, M., Shelly, F., Bezpalko, M., Stuart, J., Viggh, H., Sayer, R., Koff, R. A., Griffin, I. P., Ikari, Y., & Williams, G. V. 1999, Minor Planet Circulars 1999 DJ4
©
2004-2009, 2014
by Wm. Robert Johnston.
Last modified
20 September 2014.
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