K-Tec

August 16 Observing Guide

  • Neill
  • Neill's Avatar Topic Author
  • Offline
  • IFAS Astronomer of the Year 2011
  • IFAS Astronomer of the Year 2011
More
11 months 5 days ago #105964 by Neill
Neill created the topic: August 16 Observing Guide
Hi all,

August's guide is below :-)

OBSERVING GUIDE
(Please note all times are ST and are based on an observing location of Belfast and covers the month of August)


The Sun

At the start of the month, the Sun rises at 05:35 and sets at 21:25. By month's end, it rises at 06:30 and sets at 20:15.

The Planets

Mercury is at greatest eastern elongation on the 16th, but is not easily visible this month. At the start of the month it sets around 40 minutes after sunset and gets closer to the sun as the month progresses.

Venus is tough to spot this month. It sets around 30 minutes after sunset and on the evening of the 27th, is only 4 arcminutes from Jupiter (both should be visible in the same telescope field of view).

Mars is visible in the evening sky this month and moves from Libra into Scorpius. It passes less than 2° to the N of Antares (Alpha (α) Scorpii, mag +1.0) on the evening of the 24th. It is visible as soon as darkness falls during the month and sets at 22:40 by month’s end. It fades from mag -0.7 to mag -0.2 during the month.

Jupiter is also tough to spot this month. At the start of the month, it sets around 1 hour after sunset, but by month’s end, this has become 30 minutes. On the evening of the 27th, it is at conjunction with Venus (see above).

Saturn is visible in the evening sky in Ophiuchus this month. It is visible as soon as darkness falls during the month and sets at 23:05 by month’s end. It fades from mag +1.1 to mag +1.2 during the month.

Uranus is visible in the evening sky this month in Pisces. It lies between Omicron (ο) and Epsilon (ε) Piscium, both are mag +4.3. At the start of the month, it rises at 23:20 and at 21:20 by month’s end. It maintains its brightness at mag +5.8 during the month.

Neptune is visible in the evening sky this month in Aquarius. At the start of the month, it rises at 22:15 and at 20:20 by month’s end. It maintains its brightness at mag +7.8 during the month.

The Moon

The new moon is on the 2nd with the first quarter moon on the 10th and the full moon on the 18th. The last quarter moon is on the 25th.

On the evening of the 5th, the waxing crescent moon lies 5° to the SW of Jupiter at around 22:00.

On the evening of the 8th, the waxing crescent moon lies to the N of Spica at around 22:00.

On the evening of the 11th, the waxing gibbous moon lies to the N of Mars and to the NW of Saturn. On the following evening it lies 6° to the NE of the ringed planet. On both evenings, look at around 22:00.

On the evenings of the 18th and 19th, the waning gibbous moon lies near to Neptune. On the 18th, it lies 8° to the W of it and on the 19th, 7° to the E of the gas giant. On both evenings, look at around 23:00.

On the evening of the 21st, the waning gibbous moon lies to the SW of Uranus at around 23:00.

On the mornings of the 25th and 26th, the moon lies near to Aldebaran (Alpha (α) Tauri, mag +0.9). On the 25th, the waning gibbous moon lies to the NW of the star. On the 26th, the waning crescent moon lies 6° to the SW of it. On both mornings, look at around 01:00.

Meteors

The best time to observe meteor showers is when the moon is below the horizon; otherwise its bright glare limits the number you will see especially the fainter ones. Below is a guide to this month's showers.

The Perseids peak during the daytime of the 12th with a ZHR of 150. The radiant is visible as soon as darkness falls on the evenings of the 11th and 12th, but the moon does interfere this year. On the night of the 11th/12th, the waxing gibbous moon sets at 00:35 in Scorpius. On the following night, it sets at 01:10 in Ophiuchus. Best time to observe on both nights thus is after moonset.

There may be additional minor showers this month, details of which can be found at meteorshowersonline.com/calendar.html or imo.net/files/data/calendar/cal2016.pdf

Asteroids

Asteroid (20) Massalia is at opposition on the morning of the 1st in Capricornus. It is mag +9.9 and visible from midnight on the night of the 31st/1st.

Asteroid (19) Fortuna is at opposition on the morning of the 10th in Aquarius. It is mag +9.6 and visible from midnight on the night of the 9th/10th.

Asteroid (2) Pallas is at opposition during daytime hours of the 20th in Pegasus. It is mag +9.2 and visible as soon as darkness falls on the evenings of the 11th and 12th.

Finder charts and further information about other fainter asteroids can be found at; britastro.org/computing/charts_asteroid.html in the source list below.

Comets

There are no bright comets this month.

Any of the above estimates are based on current information at the time of writing the guide and can be wrong - “Comets are like cats; they have tails, and they do precisely what they want”, David H Levy.

Deep Sky

On the deep sky front this month, galaxies M81 and M82 can be observed in Ursa Major. Check out the constellation Canes Venatici with the globular cluster - M3 and several galaxies including M51 - the Whirlpool Galaxy and M63 - the Sunflower Galaxy. In Hercules, two globular clusters - M92 and the excellent M13 can be observed and in Lyra - M57 - The Ring Nebula can be observed. In Vulpecula - M27 - The Dumbbell Nebula can be found. In Andromeda, M31 - The Andromeda galaxy can be observed along with its satellite galaxies M32 and M110. In Perseus, there is the open cluster M34 and the excellent Double Cluster. Finally in Triangulum, there is the galaxy M33.

General Notes

Always keep an eye out for Aurorae. We have the return to dark skies in August with Astronomical twilight no longer dominating the night.

Watch out for NLCs - Noctilucent Clouds during the first half of August. Look to the North-West for a white/silvery glow 1.5 - 2 hours after sunset and to the North-East a similar amount of time before sunrise. They can sometimes be faint, sometimes bright. Other interesting naked eye phenomena to look out for include the Zodiacal Light and the Gegenschein. Both are caused by sunlight reflecting off dust particles which are present in the solar system.

The Zodiacal Light can be seen in the West after evening twilight has disappeared or in the East before the morning twilight. The best time of year to see the phenomenon is late-Feb to early-April in the evening sky and September/October in the morning sky - it's then that the ecliptic, along which the cone of the zodiacal light lies, is steepest in our skies. The Gegenschein can be seen in the area of the sky opposite the sun. To view either, you must get yourself to a very dark site to cut out the light pollution. When trying to observe either of these phenomena, it is best to do so when the moon is below the horizon. A new appendix has been added explaining some of the more technical terms used in the guide.

Clear Skies

Neill McKeown

Appendix

The ZHR or Zenithal Hourly Rate is the number of meteors an observer would see in one hour under a clear, dark sky with a limiting apparent magnitude of 6.5 and if the radiant of the shower were in the zenith. The rate that can effectively be seen is nearly always lower and decreases as the radiant is closer to the horizon. The Zenith is the overhead point in the sky.

The radiant is the point in the sky, from which (to a planetary observer) meteors appear to originate, i.e. the Perseids, for example, are meteors which appear to come from a point within the constellation of Perseus. When the radiant is quoted as "circumpolar", it is never below the horizon and visible all night, otherwise the times quoted are when the constellation in which the radiant lies rises above the horizon in the East.

A fireball is defined by the International Astronomical Union as a meteor brighter than any of the planets, i.e. magnitude -4 or brighter. The International Meteor Organisation alternatively defines it as a meteor which would have a magnitude of -3 or brighter at the zenith.

The ° symbol in the guide is that for degrees. A degree is two full moon widths to give an idea for judging any distances quoted in the guide. There are 60 arcminutes in a degree.

An asterism is a collection of stars seen in Earth's sky which form simple patterns which are easy to identify, i.e. the Big Dipper. They can be formed from stars within the same constellation or by stars from more than one constellation. Like the constellations, they are a line of sight phenomenon and the stars whilst visible in the same general direction, are not physically related and are often at significantly different distances from Earth.

Mag is short for magnitude which is the measure of an object's brightness. The smaller the number, the brighter the object. The brightest object in the sky is the Sun at mag -26, the full moon is mag -12 and Venus the brightest planet is mag -4. The brightest stars are mag -1. If there is a 1 mag difference between two objects - there is a difference in brightness of a factor of 2.5 between the two objects. For example the full moon is eight magnitudes brighter than Venus on average which means it is 1,526 times brighter than Venus. Objects down to mag +6 can be seen with the naked eye under very dark skies.

Local time is always quoted in the guide and this means for November - February - universal time (UT)/GMT is used and for April to September - daylight savings time (DST, = GMT+1). For the months of March and October when the clocks go forward/back respectively, both times will be used and attention should be paid to any times at the end of these months for that change.

Deep Sky Objects such as galaxies, nebulae and star clusters are classified in catalogues such as the Messier catalogue for objects like M44 - M for Messier. Another example of a catalogue would the New General catalogue whose objects have the prefix NGC. There are links for websites to both catalogues in the section above.

Perihelion is the point in the orbit of a planet, asteroid or comet where it is at the nearest point in its orbit to the sun. It is the opposite of Aphelion, which is when the object is at the farthest point in its orbit from the sun. For the earth, the comparative terms used are perigee and apogee and for the moon, pericynthion and apocynthion are sometimes used.

The Planets

From Earth - Mercury and Venus are the inner planets in the solar system and Mars, Jupiter, Saturn, Uranus and Neptune are the outer planets. Below is a short guide as to how both the inner and outer planets move around the sun. The above pictorial guide should hopefully help in this.

The Inner Planets

These are best seen when at Greatest Eastern/Western elongation and are not visible when at either Inferior/Superior conjunction. Greatest Eastern elongation is when the inner planet is at its furthest point east from the sun as seen from Earth and visible in the evening sky in the West after sunset, Western elongation is when it's at its furthest point west from the sun as seen from Earth and visible in the morning sky in the East before sunrise. Inferior conjunction occurs when the inner planet is between the Sun and the Earth. Superior conjunction occurs when the inner planet is on the other side of the Sun as seen from Earth.

From our Northerly latitudes, the ecliptic, along which the planets move, lies at a very shallow angle to the horizon after sunset in the autumn and before sunrise in the spring. This means that any of the planets will be difficult to see when fairly close to the Sun in the evening sky in the autumn or in the morning sky in the spring. In particular, Mercury is more or less invisible from here when at Eastern elongation in the autumn or at Western elongation in the spring, because it lies so close to the horizon and is never above the horizon except in daylight or bright twilight.

The normal cycle for an inner planet is Superior Conjunction - Greatest Eastern Elongation - Inferior Conjunction - Greatest Western Elongation - Superior Conjunction. After superior conjunction, the planet moves away from the Sun as seen from Earth and becomes visible in the evening sky after a period of time. It then moves past the point of Greatest Eastern Elongation and moves back towards the Sun as seen from Earth until a point when it is not visible and at Inferior Conjunction. After this the planet appears in the morning sky for a time, before again slipping into the Sun's glare as seen from Earth. The duration of this cycle will depend on the planet's closeness to the Sun, i.e. Mercury completes the above cycle in around 4 months.

The Outer Planets

These are best seen when at opposition and are not visible when at conjunction. Opposition occurs when the earth is between the sun and the outer planet. It is the best time to observe them because the planet is visible all through the night and it is due South and at its highest at about midnight. The planet is also at its closest point in its orbit to Earth - making it appear brighter. Conjunction occurs when the outer planet is on the other side of the Sun as seen from Earth.

If the planet is at or near it furthest point South along the ecliptic, then it won't get very high in the sky even at opposition - just as the Sun never gets high in the sky in midwinter. This happens when opposition occurs near midsummer when the planet is opposite the Sun in the sky and in midsummer the Sun is high, so the planet will be low. The opposite of course applies in winter.

The normal cycle for an outer planet is Conjunction - Western Quadrature - Opposition - Eastern Quadrature - Conjunction. After conjunction, the planet moves away from the Sun as seen from Earth and becomes visible again. The planet from this point on rises earlier and earlier in the morning sky and eventually becomes visible in the evening sky. At Western Quadrature it is at its highest at sunrise and by opposition it is in the same position by midnight. By Eastern Quadrature, it is past its best and is at its highest at sunset, meaning it is rising in daytime and setting earlier and earlier until a point when it sets too close to the Sun as seen from Earth and is no longer visible. The duration of this cycle will depend on the planet's closeness to the Sun, i.e. Jupiter completes the above cycle in around 13-14 months.

Linda: "All in all, this is one day Mittens the kitten won't soon forget."
Morbo: "Kittens give Morbo gas."
The following user(s) said Thank You: michael_murphy, Kinch, RandomPillars, scfahy

Please Log in to join the conversation.

  • Neill
  • Neill's Avatar Topic Author
  • Offline
  • IFAS Astronomer of the Year 2011
  • IFAS Astronomer of the Year 2011
More
11 months 5 days ago #105965 by Neill
Neill replied the topic: August 16 Observing Guide
Information Sources Used and Links

Sky at Night Magazine Observing Guide; www.aerith.net;cometchasing.skyhound.com ; www.ast.cam.ac.uk/%7Ejds/ ; kometen.fg-vds.de/fgk_hpe.htm ; Stardust Magazine; britastro.org/computing/charts_asteroid.html ; in-the-sky.org ; www.nightskyhunter.com/index.html ; www.eag...meris/ephemeris.html; eco.mtk.nao.ac.jp/cgi-bin/koyomi/cande/phenomena_en.cgi;
Philip's Stargazing 2016; Patrick Moore's 2016 Yearbook of Astronomy; www.heavens-above.com;www.spaceweather.com ;meteorshowersonline.com/calendar.html ; www.timeanddate.com/astronomy/;http://ww...calendar/cal2016.pdf - International Meteor Organisation; messier.seds.org/ - The Messier Catalogue website; www.seds.org/messier/xtra/ngc/ngc.html - NGC Catalogue website; www.irishastronomy.org - Irish Federation of Astronomy Societies Website; irishastro.org.uk/- Irish Astronomical Association website; www.eaas.co.uk - Northern Ireland Amateur Astronomy Society;

Comets

Finder charts and further information about the above and other fainter comets can be found at www.aerith.net , cometchasing.skyhound.com, www.ast.cam.ac.uk/%7Ejds/ , in-the-sky.org, www.nightskyhunter.com/index.html in the source list above.

Linda: "All in all, this is one day Mittens the kitten won't soon forget."
Morbo: "Kittens give Morbo gas."
The following user(s) said Thank You: Kinch, scfahy

Please Log in to join the conversation.

  • Neill
  • Neill's Avatar Topic Author
  • Offline
  • IFAS Astronomer of the Year 2011
  • IFAS Astronomer of the Year 2011
More
11 months 5 days ago - 11 months 5 days ago #105966 by Neill
Neill replied the topic: August 16 Observing Guide
Why is there an issue with too many links in posts? Have to put the links in a separate post :smashpc:

Linda: "All in all, this is one day Mittens the kitten won't soon forget."
Morbo: "Kittens give Morbo gas."
Last Edit: 11 months 5 days ago by Neill.

Please Log in to join the conversation.

  • michael_murphy
  • michael_murphy's Avatar
  • Offline
  • IFAS Chairperson
  • IFAS Chairperson
More
11 months 5 days ago #105968 by michael_murphy
michael_murphy replied the topic: August 16 Observing Guide
What error did you get Neill?

Michael

IFAS Chairperson.

Please Log in to join the conversation.

  • Neill
  • Neill's Avatar Topic Author
  • Offline
  • IFAS Astronomer of the Year 2011
  • IFAS Astronomer of the Year 2011
More
11 months 4 days ago #105970 by Neill
Neill replied the topic: August 16 Observing Guide

michael_murphy wrote: What error did you get Neill?

Michael


My emoji was a little dramatic :) . For the last few months, when I try and post the full guide - it does not let me - "Too many Links", so I remove 99.9% of the links and repost them separately. I don't know what the issue is, may be there is a character limit for a post etc. Its nothing serious. :rock:

Linda: "All in all, this is one day Mittens the kitten won't soon forget."
Morbo: "Kittens give Morbo gas."
The following user(s) said Thank You: michael_murphy

Please Log in to join the conversation.

Moderators: Neill
Time to create page: 0.212 seconds
Powered by Kunena Forum