The comet 103P/Hartley
From Ashburn (click to change), 103P/Hartley is visible in the dawn sky, rising at 01:16 (EST) – 6 hours and 1 minute before the Sun – and reach an altitude of 38° above the southern horizon before fading from view as dawn breaks at around 06:07.
Object Type Comet
|Brightness (V):||Mag 19.1|
|Semi-major axis:||3.48 AU|
|Longitude ascending node:||219.72°|
|Argument of perihelion:||181.31°|
|Epoch of elements:||23 November 2017|
|Mean Anomaly at epoch:||32.91°|
|Orbital period:||6.48 years|
The MPC's magnitude estimates are updated rather rarely, and so we prefer to estimate the brightness of comets on the basis of amateur observations. No amateur observations of are available, however, and consequently the magnitude estimates shown here may be unreliable.