The comet 123P/West-Hartley

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From Washington , 123P/West-Hartley will become visible at around 22:13 (MDT) as the dusk sky fades, 39° above your south-western horizon. It will then sink towards the horizon, setting 4 hours and 45 minutes after the Sun at 01:41.

Begin typing the name of a town near to you, and then select the town from the list of options which appear below.
Name 123P/West-Hartley
Object Type Comet
Current Position
Magnitude:14.92 (V)[1]
Right Ascension:11h53m [1]
Declination:+08°28' [1]
Distance:2.32 AU
19.29 lightmin [1]
Derived Quantities
Absolute Mag (V):44.66
Orbital Elements[1]
Semi-major axis:3.86 AU
Longitude ascending node:46.50°
Argument of perihelion:103.02°
Epoch of elements:13 May 2019
Mean Anomaly at epoch:12.73°
Derived quantities
Perihelion:2.13 AU
Aphelion:5.59 AU
Orbital period:7.58 years
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Additional sources

Magnitudes estimates are derived from observations sent into the BAA Comet Section, as compiled by Jonathan Shanklin and last updated on 3 June 2019. We use these amateur observations in preference to the MPC's magnitude estimates, since they are updated much more often. Nonetheless, all comets are intrinsically unpredictable objects, and future magnitude estimates must always be taken with a pinch of salt.




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