June 15, 2021: The Pleiades star cluster returns to the morning sky. You may have observed the star cluster in the east-northeast during morning twilight.
by Jeffrey L. Hunt
The Pleiades star cluster is low in the eastern sky before sunrise. You may have last noted the cluster in the western sky after sunset about two months ago.
As Earth revolved around the sun, the cluster disappeared behind into bright twilight. On May 20, the cluster was in conjunction with the sun. This means that it had the same celestial longitude as the sun.
Now the star cluster is beginning to appear in the morning sky. This morning it is about 7° above the east-northeast horizon at one hour before sunrise.
The assist of a binocular is needed to initially find the cluster. Begin looking about one hour before sunrise. Each morning the cluster is higher in the sky at the same time interval before sunrise. What is the first morning you can find it with the aid of additional optics.
2021, June 15: With a binocular look for the Pleiades star cluster in the east-northeast about one hour before sunrise.
Articles and Summaries
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- Mars during 2021 (Summary)
- Planets during June 2021
July 26, 2021: Four bright planets are in the evening sky. Mars closes in on Regulus for their conjunction in three evenings. Brilliant Evening Star Venus appears to the upper left of the impending Mars – Regulus conjunction. Saturn and Jupiter are low in the southeastern sky after sunset.
July 25, 2021: Four evenings before its conjunction with Regulus, find Mars in the western sky to the lower right of Venus. As the calendar day ends, look for the moon below bright Jupiter.
July 24, 2021: After sunset, Venus and Mars are in the western sky. A little later during evening hours, the moon is near Jupiter and Saturn in the southeast.
July 23, 2021: Four bright planets are visible during evening hours. Venus and Mars are in the western sky after sunset. A little later, the moon is near Saturn and Jupiter in the southeastern sky.
July 29, 2021: Jupiter and Mars are 180° apart along the ecliptic. Dim Mars sets in the west-northwest as Jupiter rises in the east-southeast. This event signals that soon both appear in the sky simultaneously.