Iapetus
Iapetus
Moon
Pisces
Sichtbar
Stufe 6
Professional/Research - Timing dependent
Eigenschaften
Helligkeit
10.2
Winkelgröße
0.2 arcmin
Type: Moon
Distance: 0.024 AU
Orbital Period: 79.3 days
Diameter: 1,469 km
Features: Dark Cassini Regio, bright Roncevaux Terra, equatorial ridge
Dramatic two-toned surface: bright trailing hemisphere (mag 10.2) and dark leading hemisphere (mag 11.9). Cassini noticed it was visible only on one side of Saturn. Far from Saturn, so easier to separate. Requires 6 inch telescope.
Position & Bezeichnungen
RA
00h 21m 33.5s
Dec
+00° 00' 18.3"
Sternbild
Pisces
Katalog
Iapetus
Physikalische Eigenschaften
Durchmesser
1,469 km
(0.12× Earth)
Masse
1.81e21 kg
Albedo
0.25
(25% reflected)
Temperatur
-173°C to -143°C
Rotation
79.3 days
Oberfläche
Dark Cassini Regio, bright Roncevaux Terra, equatorial ridge
Winkeldurchmesser
0.2″ (current)
Bahneigenschaften
Große Halbachse
0.0238 AU
(3,561,028 km)
Exzentrizität
0.0286
Bahnneigung
15.47°
Umlaufzeit
79.3 days
Entfernung
10.517 AU
(1.46 light-hours)
Elongation
2.4°
Near Sun
Beobachtungstipps
Beste Monate
April
, May
, June
Sichtbarkeit
Telescope
Wo zu finden
Near Saturn
Hinweise
Dramatic two-toned surface: bright trailing hemisphere (mag 10.2) and dark leading hemisphere (mag 11.9). Cassini noticed it was visible only on one side of Saturn. Far from Saturn, so easier to separate. Requires 6 inch telescope.
Zentralkörper
Entdeckung
Entdeckt von
Giovanni Cassini
Datum
1671-10-25
Aktuelle Ephemeriden
10.517
AU from Earth
1.57B
km
0.2″
Winkeldurchmesser
2°
Elongation
Sichtbarkeit
Standort in den Benutzereinstellungen festlegen um Sichtbarkeitsdaten zu sehen.
Community-Fotos (1)
Credit: NASA / JPL / SSI / Gordan Ugarkovic. License: CC BY-SA 2.5. (Wikimedia Commons)
Skybred Feb 28, 2026