Sky events for October 2016

1st Quarter 1st-quarter1October 8, 11:33pm

Fullfull

October 15, 11:23pm

3rd Quarter3rd-quarter

October 22, 2:14pm

Newnew

October 30, 12:38pm

 

This star map shows the Houston sky at 10 pm CDT on October 1, 9 pm CDT on October 15, and 8 pm CDT on October 31.  To use the map, put the direction you are facing at the bottom. 

oct-sky1

The Summer Triangle is high in the west.  The ‘teapot’ of Sagittarius sets in the southwest.  How long can you follow Saturn as it sets in twilight?  The Great Square of Pegasus is high in the east at dusk. To the south and east, we see a vast dim area of stars known as the ‘Celestial Sea’, where only Fomalhaut stands out. 

 

Venus is a little higher in the evening sky this month. Look low in the west in evening twilight. On Saturday, October 29, Venus passes three degrees below Saturn.

Mars and Saturn are now in the southwest at dusk.

Mars continues to fade each night as Earth leaves it farther and farther behind. Also, it moves faster than Saturn against the background stars, so you can watch Mars pull away from Saturn this month.

Jupiter emerges into the morning sky this month. Look low in the east at dawn.

The Big Dipper is to the left of the North Star, with its handle pointing up. From that handle, you can ‘arc to Arcturus’ in the west at dusk.

Antares, brightest star of Scorpius, the Scorpion, is in the southwest, with the ‘teapot’ of Sagittarius to its left. Saturn is right above Antares. The Summer Triangle is almost overhead. The stars of summer remain high in the early evening sky. Meanwhile, the Great Square of Pegasus is high in the east at dusk. Autumn is here.

Moon Phases in October 2016:

1st Quarter Oct. 8, 11:33 p.m.

Full Oct. 15, 11:23 p.m.

Last Quarter Oct. 22, 2:14 p.m.

New Oct. 30, 12:38 p.m.

Just after midnight on Wednesday, October 19, the waning gibbous Moon occults the bright star Aldebaran. Aldebaran blinks out of view at 12:04 am as the Moon passes in front of it and reappears at 1:06 am from behind the dark limb of the Moon.

In fact, the Moon has occulted Aldebaran at least once a month since January 2015; this will continue until September 3, 2018. However, many of these events are not visible from North America or happen in daytime for us. This occultation, however, is clearly visible from Houston (weather permitting, of course). The waning gibbous Moon and Aldebaran will be high in the east by midnight. You may need a telescope to watch the actual moment of disappearance, as the sunlit lunar disk will wash out Aldebaran. The reappearance, however, is noticeable in binoculars since the opposite limb of the Moon will be dark. We’ll see another occultation of Aldebaran on Monday evening, December 12, with the Moon one day before full.

Come see us Saturday nights at the George Observatory! On most clear Saturday nights at the George Observatory, you can hear me do live star tours on the observation deck with a green laser pointer.

Our annual Astronomy Day at the George Observatory is on Saturday, October 8! On Astronomy Day we have activities from 3-10 pm, and all of the telescopes, even the ones that normally cost money to look through, are free. Surf to www.astronomyday.net for more information.

Seeing Stars with James Wooten: Jupiter is Shining Bright

This star map shows the Houston sky at 10 pm CDT on August 1, 9 pm CDT on August 15, and dusk on August 31.  To use the map, put the direction you are facing at the bottom. The Summer Triangle is high overhead.  This consists of the brightest stars in Cygnus, Lyra, and Aquila.  Scorpius, the Scorpion, is in the south, with the ‘teapot’ of Sagittarius to his left.  From the Big Dipper’s handle, ‘arc to Arcturus’ and ‘speed on to Spica’ in the southwest.  Mars begins to pass under Saturn in the south at dusk.  The Great Square of Pegasus rises in the east, heralding the coming autumn.

This star map shows the Houston sky at 10 pm CDT on August 1, 9 pm CDT on August 15, and dusk on August 31. To use the map, put the direction you are facing at the bottom.
The Summer Triangle is high overhead. This consists of the brightest stars in Cygnus, Lyra, and Aquila. Scorpius, the Scorpion, is in the south, with the ‘teapot’ of Sagittarius to his left. From the Big Dipper’s handle, ‘arc to Arcturus’ and ‘speed on to Spica’ in the southwest. Mars begins to pass under Saturn in the south at dusk. The Great Square of Pegasus rises in the east, heralding the coming autumn.

Jupiter is low in the west at dusk; this is the last month to see it in the evening sky until March 2017. It outshines all stars we ever see at night, so you can’t miss it even as it sets in twilight.

Venus begins to re-emerge into the evening sky this month. How soon can you spot it low in the evening twilight? Towards the end of the month, watch Venus approach Jupiter; they are only 0.07 degrees apart on August 27. On that night you must observe right after sunset to catch that pair, as they set before twilight ends.

Mars and Saturn are now in the south southwest at dusk.

Mars continues to fade each night as Earth leaves it farther and farther behind. Also, it moves faster than Saturn against the background stars, so you can watch Mars overtake Saturn this month. Today, Mars is to the right and is much brighter. By August 23-24, however, Mars will pass between Saturn and the bright star under it, Antares in Scorpius. By the end of the month, Mars is to the left of Saturn.

The Big Dipper is above the North Star, with its handle pointing up. From that handle, you can ‘arc to Arcturus’ and then ‘speed on to Spica’; those stars are in the west at dusk.

Antares, brightest star of Scorpius, the Scorpion, is in the south, with the ‘teapot’ of Sagittarius to its left. Saturn is right above Antares. The Summer Triangle is almost overhead. The stars of summer are here. Meanwhile, the Great Square of Pegasus rises in the east at dusk, and is fully risen by month’s end. Autumn is on the way.

Moon Phases

Moon Phases in August 2016:

New Aug. 2, 3:45 p.m.

1st Quarter Aug. 10, 1:21 p.m.

Full Aug. 18, 4:27 a.m.

Last Quarter Aug. 24, 10:41 p.m.

As of Jul 19, 2016, Brazos Bend State Park is all dried out from the floods of April and May and back open to the public. Come see us Saturday nights at the George Observatory! On most clear Saturday nights at the George Observatory, you can hear me do live star tours on the observation deck with a green laser pointer.
Clear Skies!

Seeing Stars with James Wooten: Mars and Jupiter Shine Bright

This star map shows the Houston sky at 10 pm CDT on July 1, 9 pm CDT on July 15, and dusk on July 31.  To use the map, put the direction you are facing at the bottom. The Summer Triangle is high in the east.  This consists of the brightest stars in Cygnus, Lyra, and Aquila.  Scorpius, the Scorpion, is in the south, with the ‘teapot’ of Sagittarius to his left.  Leo, the Lion, sets in the west with Jupiter.  From the Big Dipper’s handle, ‘arc to Arcturus’ and ‘speed on to Spica’ in the southwest.  Mars and Saturn remain in the south at dusk.

This star map shows the Houston sky at 10 pm CDT on July 1, 9 pm CDT on July 15, and dusk on July 31. To use the map, put the direction you are facing at the bottom.
The Summer Triangle is high in the east. This consists of the brightest stars in Cygnus, Lyra, and Aquila. Scorpius, the Scorpion, is in the south, with the ‘teapot’ of Sagittarius to his left. Leo, the Lion, sets in the west with Jupiter. From the Big Dipper’s handle, ‘arc to Arcturus’ and ‘speed on to Spica’ in the southwest. Mars and Saturn remain in the south at dusk.

Jupiter is now in the west at dusk. It outshines all stars we ever see at night, so you can’t miss it.

Mars and Saturn are now in the south at dusk. As you watch them, Mars is to the right and is much brighter.

Although Mars continues to fade each night as Earth leaves it farther and farther behind, this month Mars still outshines all of the stars and even rivals Jupiter in brightness! By the end of the month, Mars begins to approach Saturn.

Venus is lost in the Sun’s glare and out of sight all month.

The Big Dipper is above the North Star, with its handle pointing up. From that handle, you can ‘arc to Arcturus’ and then ‘speed on to Spica’; those stars are in the west at dusk. Leo, the Lion, is also in the west at dusk.

Antares, brightest star of Scorpius, the Scorpion, is in the south, with the ‘teapot’ of Sagittarius to its left. Saturn is right above Antares. The Summer Triangle has fully risen in the east. The stars of summer are here.

Moon Phases
Moon Phases in July 2016:

New July 4, 6:01 a.m.

1st Quarter July 11, 7:52 p.m.

Full July 19, 5:57 p.m.

Last Quarter July 26, 6:00 p.m.

At 11:00 am on Monday, July 4, Earth is at aphelion. This means that on this date Earth is as far from the Sun as it will get this year. But all of us can feel how hot and sticky it is outside now, compared to January, when Earth was at its closest. This is because the Earth’s orbit is almost a circle; the difference between closest and farthest distance from the Sun is small. Indeed, Earth is only 1.6% farther than average from the Sun on July 4. The effect of Earth’s 23.5 degree tilt easily dominates the tiny effect of Earth’s varying distance from the Sun.

Also on July 4, the Juno spacecraft enters Jupiter orbit. For just over a year and a half, Juno will execute 37 orbits of Jupiter before a controlled orbit into Jupiter in February 2018. The spacecraft is designed to explore the inner composition of Jupiter, giving more information about what’s far beneath the cloud layers we see.

On most clear Saturday nights at the George Observatory, you can hear me do live star tours on the observation deck with a green laser pointer. As of now, however, George is closed while Brazos Bend State park dries out from yet another round of floods on the Brazos River. The park could reopen as early as July 12.

Clear Skies!

James G. Wooten
Planetarium Astronomer
Houston Museum of Natural Science

Seeing Stars with James Wooten: Mars Brightest in the Sky During the Month of the Summer Solstice

June Starmap

Jupiter is now high in the southwest at dusk. It outshines all stars we ever see at night, so you can’t miss it. 

Mars and Saturn are now in the southeast at dusk. As you watch them rise, Mars is to the right and is much brighter. 

In fact, this month Mars outshines all of the stars and even rivals Jupiter in brightness! That’s because on May 22, Earth passed between the sun and Mars. That alignment is called ‘opposition’ because it puts Mars opposite the sun in our sky, making Mars visible literally all night long. It also makes Mars much brighter than normal in the sky, since we’re as close to it as we’ll ever get until Earth overtakes Mars again in 2018. Saturn came to opposition on June 3.

Venus is lost in the sun’s glare and out of sight all month. In fact, on June 6, Venus is directly behind the sun from our vantage point.

The Big Dipper is above the North Star, with its handle pointing up. From that handle, you can ‘arc to Arcturus’ and then ‘speed on to Spica’; those stars are in the south at dusk.  Leo, the Lion, is high in the west at dusk. Venus and Jupiter come together right in front of Leo’s face, marked by stars in the shape of a sickle, or a backwards question mark. 

Antares, brightest star of Scorpius, the Scorpion, is in the southeast, with the ‘teapot’ of Sagittarius rising behind it. Saturn is right above the scorpion’s head. The Summer Triangle has fully risen in the northeast. The stars of summer are here.

Moon Phases

Moon Phases in June 2016:

New: June 5, 10 p.m.

First Quarter: June 12, 3:10 a.m.

Full: June 20, 6:02 a.m.

Last Quarter: June 27, 1:19 p.m.

Earth at Aphelion:

At 5:34 pm on Monday, June 20, the sun is directly overhead as seen from the Tropic of Cancer, the farthest point north where the sun ever appears overhead. This means Earth’s North Pole is tilted towards the sun as much as possible towards the sun, and the sun appears higher at midday than on any other day of the year. We also have more daylight on June 20 than on any other day of the year. Therefore, we call June 20, 2016, the summer solstice. Below the equator, the sun is as low at midday as it ever gets, and there is less daylight than on any other day of the year. For them, this is the winter solstice. 

But if you’re paying close attention, you’ll notice that the latest sunset occurs at the end of the month, not on June 20. As Earth approaches aphelion (farthest distance from the Sun) on its slightly elliptical orbit, it slows down slightly. This causes both sunrise and sunset to occur a little later each day. This tiny effect actually prevails near the solstices because Earth’s tilt changes very little during that time. (Think of a sine wave; near the highest and lowest points, the curve looks fairly flat). Most of us sleep through sunrise and witness sunset, so we have the (wrong) impression that the days lengthen all the way to the end of June.

On most clear Saturday nights at the George Observatory, you can hear me do live star tours on the observation deck with a green laser pointer. As of now, however, the George is closed while Brazos Bend State park dries out from yet another round of floods on the Brazos River. Stay tuned for updates.

Clear Skies!