Skywatch Line Archive

Skywatch Line for Monday and Tuesday, June 17th and 18th, 2019

This is the Skywatch Line for Monday and Tuesday, June 17th and 18th, written by Joe Slomka The Sun sets at 8:36 PM; night falls at 10:53. Dawn begins at 2:59 AM and ends with the Sun rising at 5:16. The sky, at Civil Dusk, hosts 3 bright planets. In the West, Mars and Mercury jointly inhabit Gemini. Mars appears 98% illuminated, 3 arc-seconds in size and shines with 1st magnitude. However, it is only 10º high. Mercury lies a half degree from Mars, is 50% lit, shines with zero magnitude and is twice Mars’ apparent size. This is Mercury’s… Continue reading

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Skywatch Line for Friday, June 14 through Sunday, June 16, 2019

This is Dudley Observatory’s Skywatch Line for Friday, June 14 through Sunday, June 16, written by Sam Salem. On Friday, Sun rises at 5:17am and sets at 8:36pm; the waxing gibbous Moon rises at 5:51pm and sets at 3:38am. On Saturday night, the bright Moon forms a triangle with Jupiter, to its lower left, and Antares, to its lower right. On Sunday evening, the nearly full Moon and Jupiter rise together side-by-side in the southeast at sunset. The two objects will be a little more than four degrees apart, offering a fine naked-eye sight early in the evening. Full Moon… Continue reading

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Skywatch Line for Wednesday, June 12th, and Thursday, June 13th, 2019

This is the Dudley Observatory Skywatch Line for Wednesday, June 12th, and Thursday, June 13th, written by Louis Suarato. The 77% illuminated, waxing gibbous Moon rises at 3:37 p.m. Wednesday. At 9:30 p.m., the Moon will be 40 degrees above the southern horizon, while Jupiter, just 2 days past opposition, will be 10 degrees above the southeastern horizon. Jupiter’s Galilean moon events include Io emerging from behind the planet at 9:44 p.m. Wednesday, and Europa passing behind Jupiter beginning at 3:12 a.m., Thursday. Also at 9:30 p.m., look for Mars and Mercury 8 degrees above the west-northwestern horizon separated by… Continue reading

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Skywatch Line for Monday and Tuesday, June 10th and 11th, 2019

This is the Skywatch Line for Monday and Tuesday, June 10th and 11th, written by Joe Slomka. The Sun sets at 8:33 PM; night falls at 10:48. Dawn breaks at 3:01 AM and ends with the Sun rising at 5:16. Mars and Mercury share Gemini. Mars remains at 1.8 magnitude all month. It appears about 4 arc-seconds in size and about 13º high. Mars sets at 10:30 PM. Mercury is brighter, at magnitude minus 0.3, 64% illuminated but 9º high. Mercury sets at 10:12 PM. Note that Mars appears lower daily, while Mercury rises higher daily. The Moon is at… Continue reading

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Skywatch Line for Friday, June 7 through Sunday, June 9, 2019

This is Dudley Observatory’s Skywatch Line for Friday, June 7 through Sunday, June 9, written by Sam Salem. On Friday, Sun rises at 5:18am and sets at 8:32pm; the waxing crescent Moon rises at 9:33am. On Saturday and Sunday nights use the Moon to find Regulus, the brightest star in the constellation Leo, the Lion. This blue-white star is of 1st-magnitude brightness and is the 21st brightest star. The Moon is close to Regulus for only a few days each month. When the Moon is no longer there to guide you, use the Big Dipper to guide to this star.… Continue reading

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Skywatch Line for Wednesday, June 5th, and Thursday, June 6th, 2019

This is the Dudley Observatory Skywatch Line for Wednesday, June 5th, and Thursday, June 6th, Written by Loui Suarato. The 9% illuminated, waxing crescent Moon follows Mars into the west-northwestern horizon, and sets at 9:50 Wednesday night. The Gemini twins, Castor and Pollux, trail the Moon. Jupiter rises at 8:41 p.m. in the constellation Ophiuchus. Saturn rises two hours later in Sagittarius. At 43 minutes past midnight on Thursday, Jupiter’s moon Europa begins to be eclipsed by the planet. Europa will reappear at 3:43 Thursday morning. If you would like to follow the various transits, eclipses, and occultations of Jupiter’s… Continue reading

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Skywatch Line for Monday and Tuesday, June 3rd and 4th, 2019

This is the Skywatch Line for Monday and Tuesday, June 3rd and 4th, written by Joe Slomka. The Sun sets at 8:28 PM; night falls at 10:40. Dawn begins at 3:06 AM and ends with the Sun rising at 5:18. Mars is no longer the only planet in the evening sky. The Red Planet, Mercury and the stars of Gemini all appear together this month. Mars appears about 98% illuminated, shines with 2nd magnitude, but is only 15º high in the West. Mercury makes a temporary visit to the evening sky by occupying Taurus, appearing 80% lit, but glowing with… Continue reading

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Skywatch Line for Friday, May 31 through Sunday, June 2, 2019

This is Dudley Observatory’s Skywatch Line for Friday, May 31 through Sunday, June 2, written by Sam Salem. On Friday, Sun rises at 5:21am and sets at 8:27pm; the waning crescent Moon rises at 4:00am and sets at 5:29pm. On Saturday morning, the very thin waning crescent Moon and Venus have a low-lying conjunction at dawn. The Moon sits a little more than six degrees to the right of Venus. The objects are less than 10 degrees up by sunrise. You need an unobstructed east-northeast horizon and binoculars to view the conjunction. The new Moon occurs on Monday at 6:02am.… Continue reading

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Skywatch Line for Wednesday, May 29th, and Thursday, May 30th, 2019

This is the Dudley Observatory Skywatch Line for Wednesday, May 29th, and Thursday, May 30th, written by Louis Suarato. The 20% illuminated, waning crescent Moon sets at 3:22 Wednesday afternoon. Sunset occurs at 8:24 p.m.. Civil twilight, when the Sun is 0 to 6 degrees below the horizon, and only the brightest stars and planets can be seen, begins at sunset and ends at 8:58p.m… Nautical twilight, when the Sun is between 6 and 12 degrees below the horizon, and stars can be utilized for nautical navigation, begins at 9:41 p.m.. Astronomical twilight, when the Sun is 12 to 18… Continue reading

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Skywatch Line for Monday (Memorial Day) and Tuesday, May 27th and 28th, 2019

This is the Skywatch Line for Monday (Memorial Day) and Tuesday, May 27th and 28th, written by Joe Slomka. The Sun sets at 8:23 PM; night falls at 10:34. Dawn begins at 3:14 AM and ends with the Sun rising at 5:22. Mars, in Gemini, continues as the easiest evening planet. Appearing 97% illuminated and shining with first magnitude, the Red Planet appears about 4 arc-seconds in size about 18º high in the West. It sets at 10:50 PM. Mercury hovers in the western constellation of Taurus. It shimmers with minus 1st magnitude, but is only 1º altitude, requiring an… Continue reading

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