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Dave Mitsky
2006-Jun-01, 03:25 PM
June Calendar by Dave Mitsky

All times, unless otherwise noted, are UT (subtract 4 hours and, when appropriate, 1 calendar day for EDT)

6/1 Mercury is at its greatest heliocentric latitude north (7.0 degrees) at 4:00
6/2 The Galilean satellites form two almost equally separated (30") pairs (Io and Callisto to the east and Ganymede and Europa to the west) at 2:05; the Moon is 2.2 degrees north-northeast of the first magnitude star Regulus at 21:00
6/3 First Quarter Moon occurs at 23:06
6/4 The Moon is at apogee, subtending 29'34" from a distance of 404,081 km, at 2:00; minimum lunar libration of 1.3 degrees occurs at 19:00
6/5 Saturn is 0.54 degree south-southwest of the center of the bright open cluster M44 (the Beehive Cluster) at 5:00; Ganymede reappears from eclipse at 9:14; Uranus is at western quadrature at 11:00; the Moon is at the descending node (longitude 181.5 degrees) at 12:12
6/7 The Moon is 0.28 degree northwest of the first magnitude star Spica at 8:00 - an occultation takes place in Japan and eastern Asia
6/8 Venus is at its greatest latitude south of the ecliptic (-3.4 degrees) at 14:00; Jupiter is 4.4 degrees north-northeast of the Moon at 16:00
6/9 Mercury is 2' south of the third magnitude star Epsilon Geminorum at 11:30
6/10 The Moon is 0.15 degree southeast of the first magnitude star Antares at 23:00
6/11 Maximum lunar libration of 8.2 degrees occurs at 12:00; Full Moon (known as the Flower, Rose or Strawberry Moon) occurs at 18:03
6/13 The equation of time is equal to zero at 9:00
6/14 The earliest sunrise of the year at latitude 40 degrees north occurs today
6/15 Neptune is 3.1 degrees north-northwest of the Moon at 23:00
6/16 Mars is 0.04 degree north of the center of M44 at 1:00; Pluto (magnitude 13.9, apparent size 0.1") is at opposition at 15:00; the Moon is at perigee, subtending 32'23" from a distance of 368,920 km, at 17:00
6/17 The earliest morning twilight of the year at latitude 40 degrees north occurs today; Uranus is 0.62 degree northwest of the Moon at 17:00 - an occultation takes place in New Zealand, Madagascar, southern Africa, and northeastern South America; Mars is 0.6 degree north of Saturn at 23:00
6/18 Mars (magnitude 1.8) is 0.56 degree north-northeast of Saturn (magnitude 0.4) at 5:00; minimum lunar libration of 1.4 degrees occurs at 9:00; Last Quarter Moon occurs at 14:08; the Moon is at the ascending node (longitude 0.2 degree) at 19:12
6/19 Uranus is stationary in right ascension, with retrograde (westward) motion to follow, at 14:00
6/20 Mercury is at greatest eastern elongation (24.9 degrees) at 20:00
6/21 Summer solstice occurs in the northern hemisphere at 12:30; the Sun enters the constellation of Gemini (ecliptic longitude 90.25 degrees) at 19:00
6/23 The Moon is 0.38 degree northwest of the center of the bright open cluster M45 (the Pleiades) at 3:00
6/24 The latest evening twilight at 40 degrees north occurs today; Venus is 5.7 degrees south-southeast of the center of M45 at 5:00; Mercury is at the descending node at 14:00
6/25 New Moon (lunation 1033) occurs at 16:05
6/26 Mars is at aphelion at 1:00; Io, Ganymede, and Callisto form an interesting grouping close to the western limb of Jupiter at 13:20
6/27 The latest sunset at latitude 40 degrees north occurs today; the Moon is 2.1 degrees south-southwest of the first magnitude star Pollux at 4:00; Mercury is 5.0 degrees south-southwest of the Moon at 16:00
6/28 The Moon is 2.4 degrees north-northeast of the center of M44 at 7:00; Saturn is 3.0 degrees south-southwest of the Moon at 13:00; the Moon is 0.32 degree south-southeast of the asteroid 4 Vesta at 20:00 - an occultation takes place in southern and central South America, the Caribbean, and Central America; Mars is 2.2 degrees south-southwest of the Moon at 23:00
6/30 The Moon is 2.0 degrees north-northeast of Regulus at 4:00

Times and dates for the lunar light rays predicted to occur this month are available at http://www.lunar-occultations.com/rlo/rays/rays.htm

The planets on June 1: Mercury (-1.0 magnitude, 5.7", 81% illuminated, Gemini), Venus (-3.8 magnitude, 14.0", 76% illuminated, Aries and Taurus), Mars (1.7 magnitude, 4.3", 95% illuminated, Cancer), Jupiter (-2.4 magnitude, 43.6", 100% illuminated, Libra), Saturn (0.4 magnitude, 17.1", 100% illuminated, Cancer), Uranus (5.8 magnitude, 3.5", 100% illuminated, Aquarius), Neptune (7.9 magnitude, 2.3", 100% illuminated, Capricornus), and Pluto (13.9 magnitude, 0.1", 100% illuminated, Serpens Cauda).

Morning planets: Venus, Uranus, and Neptune

Evening planets: Mercury, Mars, Jupiter, Saturn, and Pluto

During June, Mercury undergoes one of its best evening apparitions of the year. It can be seen low in the west-northwest at twilight. As the speedy planet moves closer to us, its phase and magnitude decrease.

Venus is visible very low in the east-northeast during morning twilight.

Mars hugs the horizon in the west-northwest during evening twilight. Mars and Saturn bracket M44 on the evening of June 13. By June 15, Mars moves into the center of the star cluster. The two planets are in conjunction on June 17.

Throughout June, Jupiter remains larger than 40' in apparent size. The distance between the Great Red Spot and Red Spot Junior, which lies in the South Temperate Belt, is decreasing. To determine the transit times of the Great Red Spot, click on http://skyandtelescope.com/observing/objects/planets/article_107_1.asp

Saturn sets two hours after the Sun by month's end. For several nights around June 18, the eleventh magnitude moon Iapetus is less than two ring diameters south of the Ringed Planet.

Uranus is positioned one degree north of the fifth magnitude multiple star 83 Aquarii and three degrees east of the fourth magnitude star Lambda Aquarii throughout June.

During June, Neptune is situated close to the fourth magnitude Iota Capricorni.

On June 1, Pluto is located 1.3 degrees due east of fourth magnitude Xi Serpentis. It reaches opposition on June 16 and afterwards begins to retrograde. By the end of the month, the planet's westward motion takes it to within 0.6 degree of Xi Serpentis.

The possibility exists that the normally weak June Bootid meteor shower, which peaks on June 27, may be more active than usual this year.

The eleventh magnitude Comet C/2004 B1 passes through Hercules in June. On the night of June 1, it is just north of the elliptical galaxy NGC 6482.

Although the fractured periodic comet 73P/Schwassmann-Wachmann 3 did not live up to some of the more optimistic predictions about it, the B and C fragments were interesting targets to observe last month. During June, the fast moving comet is strictly a southern hemisphere object.

Shining at eighth magnitude, Asteroid 4 Vesta passes by the twelfth magnitude spiral galaxy NGC 2599 on the night of June 8. It glides north of M44 several nights later.

Forty binary and multiple stars for June: Struve 1812, Kappa Bootis, Otto Struve 279, Iota Bootis, Struve 1825, Struve 1835, Pi Bootis, Epsilon Bootis, Struve 1889, 39 Bootis, Xi Bootis, Struve 1910, Delta Bootis, Mu Bootis (Bootes); Struve 1803 (Canes Venatici); Struve 1932, Struve 1964, Zeta Coronae Borealis, Struve 1973, Otto Struve 302 (Corona Borealis); Struve 1927, Struve 1984, Struve 2054, Eta Draconis, 17-16 Draconis, 17 Draconis (Draco); 54 Hydrae (Hydra); Struve 1919, 5 Serpentis, 6 Serpentis, Struve 1950, Delta Serpentis, Otto Struve 300, Beta Serpentis, Struve 1985 (Serpens Caput); Struve 1831 (Ursa Major); Pi-1 Ursae Minoris (Ursa Minor); Struve 1802, Struve 1833, Phi Virginis (Virgo)

Challenge binary star for June: Gamma Coronae Borealis

Fifty deep-sky objects for June: NGC 5466, NGC 5676, NGC 5689 (Bootes); M102 (NGC 5866), NGC 5678, NGC 5879, NGC 5905, NGC 5907, NGC 5908, NGC 5949, NGC 5963, NGC 5965, NGC 5982, NGC 5985, NGC 6015 (Draco); NGC 5694 (Hydra); NGC 5728, NGC 5791, NGC 5796, NGC 5812, NGC 5861, NGC 5878, NGC 5897 (Libra); M5, NGC 5921, NGC 5957, NGC 5962, NGC 5970, NGC 5962 (Serpens Caput); M101, NGC 5473, NGC 5474, NGC 5485, NGC 5585, NGC 5631 (Ursa Major); NGC 5566, NGC 5634, NGC 5701, NGC 5713, NGC 5746, NGC 5750, NGC 5775, NGC 5806, NGC 5813, NGC 5831, NGC 5838, NGC 5846, NGC 5850, NGC 5854, NGC 5864 (Virgo)

Challenge deep-sky object for June: Abell 2065