Mars and Neptune REAL close Dec 7

by Brett Tatton

I hope we get to observe Neptune and Mars next week when they are as close to each other as one half the Moon's diameter!

Mars will be quite obvious in the south above bright Fomalhaut -Alpha Piscis Austrini (the Alpha star of the Southern Fish).


I made these finder charts with Sky Safari to help show the area of sky and then to provide enough detail to help identify Neptune.

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Finding Neptune using Mars alone may not be the way to go. The relative position of Neptune to the Red Planet is changing as Mars streaks across the sky! Alternatively I suggest using 81 and 82 Aquarii as pointers. (See last chart below) Eighth magnitude Neptune is almost in a line with these two magnitude 6 stars.

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On the detailed chart (below) I have identified the star HD217572 for you to use as a brightness comparison to Neptune. Both are at about magnitude 8 (give or take a decimal).

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I hope the skies co-operate and I hope these notes and the charts will help you to zeroing in on Neptune!
Brett

ANOTHER COMET for Christmas???

Comet Alert! A new comet has been discovered!

Comet C/2018 V1 (Macholtz-Fujikawa-Iwamoto -henceforth Comet M-F-I) was just discovered (Nov 7) and it gives us another opportunity to spot a comet this year (along with Wirtanen which is also brightening on schedule -last estimate magnitude 7).
Below is the Sky and Telescope finder chart. C/2018 V1 passed the star Porrima in Virgo Wed am Nov 12 and it is tracking eastwards (left) over the next few weeks as it gradually approaches the Sun. It transitions into the evening sky in early December.

Comet C/2018V1 is now 8th magnitude or brighter!
Look East at the start of morning twilight towards Venus and Spica in Virgo. The comet is moving generally eastwards towards the sunrise Virgo and gets closest to the planet on Nov 18 (only 10° from Venus at magnitude -4). The moon is nowhere in the sky at this time of morning and it is worth getting up before dawn to have a look. The comet should brighten perhaps to magnitude 5 or so as it approaches the Sun but it will also become lost in the glare by month end. See the charts at the bottom of this weblog. Rounding the Sun in early December, it switches over into the evening sky and will perhaps be its brightest then. Comet M-F-I is not predicted to get as bright as Wirtanen but these objects are of course, unpredictable. Read all about the discovery here: https://www.skyandtelescope.com/astronomy-news/observing-news/machholz-12th-comet/
An image taken Nov 11 is provided at the S&T link above and I include it below. Don’t expect it to look like this visually, this is a long exposure image. There may be a hint of green colour, however.

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The new comet, now formally named C/2018 V1 (Machholz-Fujikawa-Iwamoto) glows green and sports a faint tail pointing west-northwest in this image taken on Nov. 11.
Michael Jäger

Here is one website (IAU Minor Planet Centre) which will give you the elements of the orbit that you can enter into a program like Starry Night to create the path for yourself: https://www.minorplanetcenter.net/iau/Ephemerides/SoftwareEls.html

Star charts for morning viewing from Nov 22 to Nov 28 and evening viewing from Dec 2 to 10 are provided below. Click to download copies.


C-MFI-Nov-22-28

C-MFI-Dec-2-10

Christmas Comet? Maybe


A Comet for Christmas?
by John Hlynialuk

While there has been no lack of planetary activity to enjoy in the night sky (Venus, Jupiter and Mars!), one celestial spectacle has been missing for a long time. We have not had a bright comet for a dozen years or so and any that have shown up have required telescopes or binoculars to see. The most recent one was Comet 26P/Giacobini-Zinner and it was captured nicely on camera by Frank W. See the
HOME page.

We are long overdue for a really bright comet and although I would like to report otherwise, the comet predicted for Christmas will be a good comet, but not likely a spectacular one. However, as one famous comet hunter, David H. Levy commented, “Comets are like cats: they have tails and do precisely what they want.”

Of all celestial objects, comets are the most elusive and most unpredictable. Astronomers know many of their orbits with high precision, but their behaviour when these chunks of frozen ice and gas get near the Sun is much less certain. Many do not brighten on schedule, some break up or get destroyed by a close pass to the Sun and others burst forth in spectacular fashion. The most famous example of a much-ballyhooed comet that flopped was Comet Kohoutek in 1973. I tried more than once to catch a glimpse of Kohoutek and failed, and my better half notes (with glee) that she spotted it casually during a snowmobile ride on a frozen lake in the Peterborough area. (That was in our pre-courting days, so it does not really count.)

As in the case of Comet Kohoutek, comets can be a complete fizzle, or they can totally defy predictions and be easily seen even from our brightly-lit cities. The last such comet was Comet Hale-Bopp in 1997 with a spectacular show for over a year remaining visible to the naked eye for 18 months. But who remembers Comet Hyakatake? This one appeared a year before Hale-Bopp, had a larger tail, and came closer to Earth (a close shave of only 15 million km) than the 200 million km wide pass of Hale-Bopp.
23HyakApr:96Hale-Bopp-comet-1997_edited-1
Image left: Comet Hyakatake imaged from April 1996 Image right: Comet Hale-Bopp at its best in March 1997 Both images by John H.

Unfortunately Hyakatake only appeared for 3 months in 1996 during typically cloudy spring weather, and you had to be dedicated to spot it. I had learned a lesson with Kohoutek, and thankfully, the weather cooperated, so I did observe and photograph it on several occasions.

This Christmas, Comet 46/P Wirtanen is expected to appear in our skies, and away from city lights (and moonlight), it may be an interesting sight. Due to be brightest during the later part of 2018 and early January 2019, predictions (for what those are worth) are that it may get to be visible to the naked eye, -but don’t expect another Hale-Bopp.

Comet 46/P Wirtanen was preceded by another, a summer comet, Comet Giacobini-Zinner, and if predictions are borne out, Comet 46/P will be better than Comet G-Z and should peak late in the year. The best times to view will be during Moon-free periods in the first two weeks of December and again in the first part of January 2019. Full Moon occurs Dec 22 and Wirtanen will not likely be seen over the bright moonlight. But if you can dodge the moon by waiting for it to set, Wirtanen will be above the horizon all night long from mid-December into the new year. For a chart showing the path of 46/P from Dec 1 to Christmas Day see below:
Wirtanen-Dec-1-to-25

Additional information about Comet 46P/ can be found on the VIS.COMETS page. Click on the map to download a copy. Good luck with your comet viewing!

A Demon Star for Halloween

by John Hlynialuk
A traditional depiction in mythology of Perseus is shown below. This is
plate 6 in Urania's Mirror by Jehoshaphat Aspin, London, 1824. One of 32 hand-coloured constellation cards, the set depicts most of the familiar constellations as works of art rather than what is seen in modern atlases which strive for accuracy in star position, brightness, type, etc. and provide no fanciful artwork at all. Pity.

Perseus_800K

There are many interesting stars in Perseus but at this time of year when the ghouls are out, we pick on Algol the Demon Star. Modern astronomers have dug deep and revealed an extra-ordinary story.

The second brightest star in Perseus, Algol, has a name which translates from Arabic as “head of the ogre”, original: “ra’s al ghul”, a creature who stalked graveyards and consumed human flesh. There is also the obvious connection to our word “ghoul.” So from ancient times, Algol has been called the Demon Star.

In the myth associated with the Demon Star, innocent Andromeda is on the verge of being dismembered for being beautiful (it was her mother’s boast that got her into trouble, actually). Our hero, Perseus is returning with the severed blood-soaked head of Medusa (she had a bad hair day) and saves Andromeda from Cetus the Sea Monster by turning the monster into stone. There are (unconfirmed) reports that more than one of the Greek islands are the site of the monstrous body, -check the tourist literature.

By the end of the mythological saga, Perseus, Andromeda, her boastful mother -Queen Cassiopeia and her father, King Cepheus become constellations in the sky, -even Cetus is there a bit further off. The classical depiction of Perseus (in the image above) shows Algol, the Demon Star, as one of Medusa’s eyes. But like only a few other stars in the heavens, Algol actually changes its light output visibly! It’s as if Algol, the Demon Eye of the Medusa, is winking at us. It is certainly a relief that she is 98.2 light years away, well beyond turning-to-stone range.

It is not definitively known if ancient myth-makers noticed Algol’s variation and built it into their stories, but by 1783, English astronomer John Goodricke showed that the variable Algol had a very regular period indeed. This unique discovery gained Goodricke the Royal Society’s Copley Medal, a prize first awarded in 1731 and still presented annually today. Algol’s precise clock-like variations occur over 2 days, 20 hours and 48.9 minutes. During that time, it fades for exactly 10 hours and then brightens back to normal. Repeat 2.86730 days later.

The variability of Algol lies in the fact that it is actually three stars and two orbit each other so that they pass directly in front of each other from our perspective. The combined light output drops during the 10 hour eclipse which gives these stars their type name: eclipsing binaries. Algol was the first variable recognized as such and is one of only a few that can be noticed by the naked eye. It’s like Medusa is continually trying to change us to stone, -with a 10 hour wink- thank goodness the “petrification energy” gets totally diluted over the vast distance.


An ordinary star chart is provided below (Credit IAU and Sky&Tel) to help you locate Algol in Perseus. It is usually easy because it spends most if its time as the second brightest star in Perseus after Mirfak. Algol is usually a magnitude 2.1 star and only drops to magnitude 3.3 every 2.86736 days for about 10 hours. So you need a schedule to tell you when the eclipse will happen during a time when Algol is in the night sky. There are four good chances in October and these are given at the end of this article.

IAU Perseus


The light curve diagram provided here for Algol shows the two dips in its brightness as each of the two stars eclipse each other. The primary eclipse occurs when the larger, cooler, dimmer Algol B partially hides the smaller, hotter, brighter, more massive Algol A. The secondary eclipse is when Algol A hides Algol B.

a5WildernessAbove2

The times when an eclipse occurs are provided in various publications or online. Google “Algol minima” for some of those. In any case, the next good opportunities to see Algol blink at us are Oct 18 at 2:09 am when Perseus is high in the sky. Then on Oct 21, at 22:58 EDT (about 11 pm) with Perseus still high in the east, and Oct 23 with an eclipse starting at 19:47 EDT (7:47 pm Perseus above NE horizon). The last opportunity in October is Oct 26 with an eclipse starting at 4:36 pm EDT. By mid-eclipse Perseus should be high enough above the NE horizon for Algol to be seen. You can watch the star come back out of eclipse in the wee hours of the morning, around 2:30 am or so.

Miulky Way/Summer Triangle last hurrah

Summer Triangle: Best in Autumn
by John Hlynialuk
Bluewater Astronomical Society

In October, we are officially into fall but the night sky is still in summer mode. The two summer astronomical objects on prominent display are the summer Milky Way and the Summer Triangle, and it will be well into winter before both disappear below the western horizon. So let’s say a proper goodbye to the summertime night sky.


Sum-Tri-MW


For the next few months, when clouds part long enough at night for you to see anything, the Milky Way stands vertically over the SW horizon and stretches overhead and behind you. At a dark sky location, you can follow the glow of our home galaxy right to the northeastern horizon. Star charts are available on the BAS website www.bluewaterastronomy.com under the CHARTS/FORMS tab and also at www.skymaps.com and an all-sky chart is included here. Start by looking southwards and locate the most obvious patch of Milky Way just above the southwestern horizon. The constellation there is Sagittarius, looking like a teapot tipped somewhat to the right. Say a hello in passing to Saturn just off the lid of the teapot. Now follow the Milky Way glow up to Aquila and overhead to Cygnus. Then turn around, face north and continue down past Cassiopeia to Perseus low above the northeastern horizon. At a dark site you should be able to trace the glow of the millions of stars that make up the Milky Way from horizon to horizon. The glow is more obvious in Sagittarius because you are looking itoward the centre of the galaxy where more stars are concentrated. In the opposite direction, looking past Perseus, you are gazing out into the less starry regions beyond the edge of our home in the Universe.

To locate the Summer Triangle, find the bright “alpha” stars of Cygnus, Lyra and Aquila. This is not hard as these constellations are straight up at the zenith right now. Look for the three brightest stars that together form a large right-angled triangle. Those stars are Deneb, Vega and Altair, -hints are on the chart.

It will be several months before this asterism disappears completely and even at years-end, Deneb will still be visible before midnight above the NW horizon. In December, of course, no one will be thinking about summer and the only “Milky Way” will probably be steam rising from mugs of hot chocolate as hardy stargazers check out our winter constellations.

As for other sky objects, there are only two bright planets left in the night sky, Mars and Saturn. Venus is lost in solar glare low in the west and Jupiter is close behind. Both drop quickly into the western sunset glow and by 9 pm, the time of the included chart, both have disappeared. The remaining planets, Saturn and Mars, are not labelled on the chart but they are not hard to find, -both are bright enough to be the first “stars” you see at night.

Let’s hope for a few nice, not too frosty, autumn nights to catch the last of the offerings of the summer sky. And if it is too cloudy, do some armchair astronomy by reading my weblog on the BAS website.

Clear skies!