Lunar Occultations: January and February 2021

Limiting magnitude +6.0

Details of occultations of fainter stars for your location are available from the director on request. You can either send an e-mail or use the regular post. If you choose the latter means of communication then an SAE is required please.

        Greenwich   Edinburgh   
21-Jan38 Arietis, UV ArietisAri4043666930835.2DD21h 59m383424422h 00m1834239
26-Jan5 GeminorumGem9368523780795.8DD01h 18mConjunctionNo Occultation
26-Janomega GeminorumGem107010307789995.2DD21h 47m1576115621h 31m13155147
27-Jan48 GeminorumGem109210657791625.8DD02h 59m1123526502h 49m10538257
01-Febnu VirginisVir1702176331190354RD01h 37m3084215201h 32m31737148
17-Febxi ArietisAri3543257929325.5DD19h 20m523723519h 18m3536228
25-FebAsellus Borealis, gamma CancriCan130813242803784.7DD02h 40m1093326402h 30m10535256

 If you are successful in observing these or any other of the events listed, then please let me know via email ( or the address in Popular Astronomy, or visit the SPA Observing Forum, and share your observation report.



Mag    Visual Magnitude
ZC       Zodiacal Catalogue number, originally much favoured by lunar occultation observers
XZ       XZ80Q Catalogue number
SAO    Smithsonian Astrophysical Observatory Catalogue number
PL       (R)eappearance, (D)isappearance or (G)raze, followed by (D)ark or (B)right referring to the limb of the Moon
Alt       Altitude. The angular height of the Moon above the horizon at the time of the occultation
Az       The angular position along the horizon measured from true north in a clockwise direction (through E. S. W back to N.)
PA       Position Angle, of the event, measured in an anti-clockwise direction from the direction of the Celestial North Pole.

It is worth remembering that more lunar occultation events can be seen during this period, involving much fainter stars. However, this requires a larger aperture telescope to view them successfully. The limiting magnitude for SPA listed events is normally set at no fainter than +6.0, bringing them into the range of smaller telescope apertures in the 60mm – 70mm size. If you do have access to a medium to large aperture telescope, then you will have the capability to observe many more events, even within a single night. If you are interested in seeing a more detailed listing for your specific observing location then please contact me.