Asteroids with Satellites Database--Johnston's Archive
(939)
Isberga
compiled by Wm. Robert Johnston
last updated
15 June 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: |
2.2467449376 AU
| |
orbital period P: |
3.367678759 yr
(= 1230.0678981 d)
| |
eccentricity e: |
0.177463926
| |
perihelion distance q: |
1.848028761 AU
| |
aphelion distance Q: |
2.6454611141 AU
| |
inclination i: |
2.5877179°
| |
argument of perihelion ω: |
5.904982°
| |
ascending node Ω: |
327.135247°
| |
mean anomaly M: |
13.610505°
| |
perihelion passage TP: |
2014 Oct 23.494874
| |
Epoch: |
2014 Dec 09
| |
data arc: |
1920-2014
(2091 obs.)
| |
Earth MOID: |
0.838312 AU
| |
Jupiter Tisserand invariant TJ: |
3.608
|
orbital data, secondary:
|
binary dynamical type: | U [L15a] | |
semimajor axis as: |
33
± 4.5 km
[C15a]
| |
separation/primary radius as/rp: | 5 [C15a] | |
separation/Hill radius as/rH: | 0.014 [*D] | |
orbital period Ps: |
1.1096
± 0.000004
d [C15a]
| |
eccentricity es: |
<0.1
[C15a]
| |
normalized ang. mom. αL: |
?
|
|
other data, system (combined):
|
absolute mag. H: |
12.14
[MPC]
| |
slope parameter G: |
(0.15) [*A]
| |
effective diameter dE: |
12.9
± 1.9
km [C15a]
| |
geometric albedo: |
0.14
± 0.075
[C15a]
| |
color index U-B: |
0.54
[JPL]
| |
color index B-V: |
0.93
[JPL]
| |
taxonomic type: |
S (Tholen) [JPL]
| |
mass m: |
3.61x1015
± 1.74x1015
kg [C15a]
| |
density ρ: |
2.91
± 1.86
g/cm3[C15a]
| |
Hill radius rH: |
2300 km [*D]
|
other data, primary:
|
diameter dp: |
12.4
± 1.8
km [C15a]
| |
dimensions : | 14.5 x 11.8 x 11.1km [*D] | |
axial ratios a/b, b/c: | 1.23, 1.06 [C15a] | |
volume : | 1000[C15a] | |
rotation period RPp: |
2.91695
± 0.0001
h [C15a]
| |
amplitude in mag., rotational ΔM: |
0.25
[M08e]
| |
amplitude in mag., mutual events ΔM: | 0.15 [M08e] | |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
|
diameter ds: |
3.6
± 0.5
km [C15a]
| |
dimensions : | 3.8 x 3.5 x 3.5km [*D] | |
axial ratios a/b, b/c: | 1.1;1 [C15a] | |
diameter ratio ds/dp: |
0.29
± 0.02
[C15a]
| |
component mag. difference ΔM: |
2.7
[*D]
| |
rotation period RPs: |
26.6304
± 0.0001
h [C15a]
| |
|
|
--
(939) Isberga
--discovery and notes:
Primary discovered
1920 Oct 04
from
Heidelberg, Germany
by
K. Reinmuth.
Alternate designation(s):
1920 HR,
1930 QP, 1957 QE, 1957 UU.
Permanent number assigned -.
Named - for a girl's name.
Companion discovered
2006 Feb 26
using
lightcurve
observations.
Announced
2007.
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
- Todd, M., Wallon Pizarro, H. U., Tanga, P., Coward, D. M., & Zadnik, M. G. 2014, ArXiv e-prints HEIDI: An Automated Process for the Identification and Extraction of Photometric Light Curves from Astronomical Images
- Molnar, Lawrence A., Haegert, Melissa, J., Beaumont, Christopher N., Block, Marjorie J., Brom, Timothy H., Butler, Andrew R., Cook, Peter L., Green, Allyson, G., Holtrop, Joshua P., Hoogeboom, Kathleen M., Kulisek, Jason J., Lovelace, Jonathan S., Olivero, Jeffrey S., Shrestha, Achyut, Taylor, Jessie F., Todd, Kenneth, D., Vander Heide, John D., & van Coter, Samuel O. 2008, Minor Planet Bulletin Lightcurve Analysis of a Magnitude Limited Asteroid Sample
©
2007-2014, 2022
by Wm. Robert Johnston.
Last modified
15 June 2022.
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