2021 Lunar Occultations of/Conjunctions with Bright Stars

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Christopher K.
Posts: 5640
Joined: October 12th, 2009, 3:28 pm
Location: Baton Rouge, LA

2021 Lunar Occultations of/Conjunctions with Bright Stars

Post by Christopher K. »

Friday night between 9pm and 9:10pm, the waning gibbous Moon will occult the magnitude 3.4 B-class star Eta Leonis. At this time the Moon will be about twenty-nine degrees up in the east.

This event takes place while the Highland Road Park Observatory is open. Patrons are encouraged to bring binoculars.

More information:
http://www.lunar-occultations.com/iota/ ... zc1484.htm
http://hrpo.lsu.edu/observatory/hours.html
Christopher K.
Posts: 5640
Joined: October 12th, 2009, 3:28 pm
Location: Baton Rouge, LA

Re: 2021 Lunar Occultations of/Conjunctions with Bright Stars

Post by Christopher K. »

The more detailed, official alert...

29 January 2021
Eta Leonis
[ingress ~9:07pm CST at azimuth 86˚ / altitude 28˚; near crater Dechen, or about lunar latitude 46˚N]
[egress ~9:57pm CDT at azimuth 92˚ / altitude 38˚; near crater Messala, or about lunar latitude 39˚N]


More information:
http://www.lunar-occultations.com/iota/ ... zc1484.htm

This is NOAA's current forecast for 9pm...
precipitation potential, 0%
sky cover, 11%
relative humidity, 75%
temperature, 8˚C
surface wind, SE 5 km/h

Danko's Clear Dark Sky states that at 9pm both the transparency rating and the seeing rating will be "average" (3 out of 5).
sdcadwall
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Joined: December 12th, 2018, 10:11 am

Re: 2021 Lunar Occultations of/Conjunctions with Bright Stars

Post by sdcadwall »

I was able to observe both the ingress and egress: I logged the ingress at 2107:30 and the egress at 2157:25-30. The egress, as often is the case, proved more difficult, mainly due to the element of surprise. I suspect that it exited a little behind an unlit portion of the moon from my perspective. I was using a 8" Newt at 133x. Seeing was probably a little below average, but transparency improved from well below average to average over the 50 minute period.
Christopher K.
Posts: 5640
Joined: October 12th, 2009, 3:28 pm
Location: Baton Rouge, LA

Re: 2021 Lunar Occultations of/Conjunctions with Bright Stars

Post by Christopher K. »

I must admit I underestimated the percentage of a magnitude three star's illumination that would be supressed by a gibbous Moon. Both Judah and Jordan showed me a view during public time at HRPO. Judah was using the Orion 10" Skyquest Dobsonian and had a 9mm, yielding ~133x as well, and yet the star was still just a tiny pinpoint.
Christopher K.
Posts: 5640
Joined: October 12th, 2009, 3:28 pm
Location: Baton Rouge, LA

Re: 2021 Lunar Occultations of/Conjunctions with Bright Stars

Post by Christopher K. »

18 March 2021, 8:00pm to 9:30pm CDT
MODERATE: Moon-Pleiades


The two will be setting together in the west, in the constellation Taurus. The 5.6-day-old Moon will have the star cluster to its upper right, the pair remaining fewer than six degrees apart the whole time.

Pertinent graphic:
https://skyandtelescope.org/wp-content/ ... ar19ev.jpg
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