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In the Sky This Week – June 19, 2018

By Robert Trembley  |  19 Jun 2018

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This entry is part 100 of 248 in the series In the Sky This Week

Southern sky after sunset, June 20 2018

Jupiter, the Moon, and the stars Arcturus and Spica are all in the same region of the southern sky at 10:30 PM on June 20th.

Southern sky after sunset, June 20 2018 Jupiter the Moon, and the stars Arcturus and Spica in the southern sky at 10:30 PM on June 20th. Credit: Stellarium / Bob Trembley.

Saturn is low in the southeastern sky, and Jupiter is high in the southern sky after sunset.

Southeastern sky after sunset, June 20 2018 Saturn in the southeastern sky at 10:30 PM, June 20, 2018. Credit: Stellarium / Bob Trembley.

Mars shines bright red in the southern sky early in the morning; Saturn is a bit lower in the sky, and towards the southwest.

Mars and Saturn in the southern sky at 3:30 AM, June 21, 2018 Mars and Saturn in the southern sky at 3:30 AM, June 21, 2018. Credit: Stellarium / Bob Trembley.

A waxing crescent Moon joins Venus in the western sky at sunset. Mercury also makes an appearance low in the western sky – a brief few moments before sunset.

Western sky at dusk, June 19 2018 Moon, Venus and Mercury in the sky at 9:30 PM, June 19, 2018. Credit: Stellarium / Bob Trembley.

Mercury will continue to brighten as it climbs towards Venus until July 1st, after which it will start to descend towards the horizon, vanishing around end of July.

The Moon

Moon Week of June 19-25 2018 The Moon from June 5-11, 2018. Visualizations by Ernie Wright

The Moon is a waxing crescent and will be at first quarter on June 20th; the Moon will then be a waxing gibbous. This will be a great week for observing the Moon near sunset!

Observing Target: M13 – The Great Cluster in Hercules

M13 is a globular cluster in the constellation Hercules, and probably the 2nd object I pointed my 8 inch Dobsonian telescope at.

In small telescopes, M13 appears like a nebulous puff-ball – almost like a comet. In medium to large-sized telescopes, hundreds of stars become distinct, some looking like diamonds. Space telescope images of the M13 reveal hundreds of thousands of stars; M13 really is quite a stunning sight.

Time-lapse simulation of a globular star cluster over several hundreds of thousands of years:

Animation of a globular cluster in 3D:

The Sun

AR2713 is a small sunspot group near the equator of the Sun; the spot is very small, and hard to spot on HMI images. However it’s easy to see the active region at the frequencies shown in the videos below – there is a lot of coronal loop activity associated with this sunspot.

https://sdo.gsfc.nasa.gov/assets/img/dailymov/2018/06/18/20180618_1024_0193.mp4

Coronal holes have reopened at both poles; SpaceWeather.com says: “Earth is moving deeper into a stream of solar wind that arrived during the early hours of June 18th. This is causing the solar wind near our planet to quicken, blowing faster than 500 km/s (1.1 million mph). High latitude sky watchers should remain alert for auroras, especially in the southern hemisphere where winter darkness favors visibility.” The solar wind speed is 488.6 km/sec, with a density of 12.3 protons/cm3 – that’s the highest particle density I’ve seen!

As has been the norm for the last few weeks, several small short-lived prominences have been appearing on the Sun’s limb over the past couple days; AR2713 is the bright orange region in the video below:

https://sdo.gsfc.nasa.gov/assets/img/dailymov/2018/06/18/20180618_1024_0304.mp4
You can view the Sun in near real-time, in multiple frequencies here: SDO-The Sun Now.
You can create your own time-lapse movies of the Sun here: AIA/HMI Browse Data.
You can browse all the SDO images of the Sun from 2010 to the present here: Browse SDO archive.

Asteroids

Upcoming Earth-asteroid encounters:

Asteroid
Date(UT)
Miss Distance
Velocity (km/s)
Diameter (m)
2018 KC3
2018-Jun-19
14.6 LD
8.8
87
2018 LA6
2018-Jun-19
10.2 LD
11
16
2018 MK
2018-Jun-20
7.5 LD
17.1
53
2018 MA
2018-Jun-21
19.2 LD
16.6
49
2018 LX5
2018-Jun-21
5.2 LD
11.7
31
2018 LS5
2018-Jun-21
6.5 LD
9
16
2017 YE5
2018-Jun-21
15.6 LD
15.5
513
467309
2018-Jun-23
17.9 LD
14
355
441987
2018-Jun-24
7.3 LD
12.6
178
2018 LD3
2018-Jun-24
19.9 LD
14.2
69
2018 LN2
2018-Jun-28
10.5 LD
9.4
88
2018 LR3
2018-Jun-29
6 LD
3.8
19
2018 LT6
2018-Jul-01
11.6 LD
13
126
2018 LJ1
2018-Jul-01
13.9 LD
2.7
18

Notes: LD means “Lunar Distance.” 1 LD = 384,401 km, the distance between Earth and the Moon. Table from SpaceWeather.com

Near-Earth objects (NEOs) discovered this month: 70, this year: 828, all time: 18378.
Potentially hazardous asteroids: 1912 (as of June 19, 2018)
Minor Planets discovered: 779,736 (as of June 19, 2018)

Asteroid Day Logo

Fireballs

On June 19, 2018, the NASA All Sky Fireball Network reported 19 fireballs.

Fireball orbits June 18, 2018 In this diagram of the inner solar system, all of the fireball orbits intersect at a single point–Earth. Source: Spaceweather.com

The Solar System

This is the position of the planets and a couple spacecraft in the solar system:

Inner Solar System June 19 2018 Position of the planets in the inner solar system, June 19, 2018. Credit: NASA Eyes on the Solar System / Bob Trembley.
Middle Solar System June 19 2018 Position of the planets in the middle solar system, June 19, 2018. Credit: NASA Eyes on the Solar System / Bob Trembley.
Inner Solar System June 19 2018 - Alternate View Alternate view of the planets in the Inner solar system, June 19, 2018. Credit: NASA Eyes on the Solar System / Bob Trembley.

Exoplanets

Confirmed Exoplanets: 3,735 (5/31/2018)
Multi-Planet Systems: 614 (5/31/2018)
Kepler Candidate Exoplanets: 4,496 (8/31/2017)
TESS Candidate Exoplanets: 0
Data from the NASA Exoplanet Archive

Exoplanet of the Week: WASP-12 B

Exoplanet WASP-12 B Exoplanet WASP-12 B. Credit: NASA Eyes on the Solar System / Bob Trembley.

Apps used for this post:

Stellarium: a free open source planetarium app for PC/MAC/Linux. It’s a great tool for planning observing sessions.
NASA Eyes on the Solar System: an immersive 3D solar system and space mission simulator – free for the PC /MAC. I maintain the unofficial NASA Eyes Facebook page.

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More Posts in this Series:
"In the Sky This Week"

78  |  What Do We Lose When We Sacrifice Science?

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69  |  To err is human… to admit it, is science

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99  |  In the Sky This Week – June 12, 2018

By Robert Trembley  |  12 Jun 2018

101  |  In the Sky This Week – August 1, 2017

By Robert Trembley  |  1 Aug 2017

102  |  In the Sky This Week – July 3, 2018

By Robert Trembley  |  3 Jul 2018

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