Lunar Occultation of Aldebaran Tonight

The Chronicle of a Net Community 26 Jan 1999

by
Bill Arnett
David North
Mark Wagner
Jane Houston
Jay Reynolds Freeman
Morris Jones


18:09:45 PST Bill Arnett
If the weather cooperates (or if you happen to get a hole at the right time), there will be an occultation of Aldebaran visible from the Bay Area this evening at about 11:30pm. The reappearance will be a little after 12:30am. I think I read somewhere that this is the last of the recent series of these events for a while.

18:14:01 David North
I've got large holes here and there will be occultations of Hyades all evening. Right now there are four good ones marching on the dark limb... no need to wait!

19:09:18 Mark Wagner
7:00 p.m. in Los Gatos. The sky is mostly clear, but is about as unsteady as I've seen it in a long time. There's more twinkling than you can believe, even up high.

I do note that the moon is quite close to Aldebaran, and if I recall tonight/tomorrow is supposed to be an occultation. Anyone know of if we are supposed to be able to see it here?

I'm half tempted to break out a scope, but those wobbly stars and bright moon don't look like such a good combination.

19:19:12 David North
>>I do note that the moon is quite close to Aldebaran, and if I recall tonight/tomorrow is supposed to be an occultation.<<

Just registered my first one at 7:14 on the nose (mag 4.97 75 Tauri about 10 seconds or so off Starry Night's prediction, and that's just using my watch...)

>>Anyone know of if we are supposed to be able to see it here?<<

You bet. Much later, but several other stars will be occulted.

>>I'm half tempted to break out a scope, but those wobbly stars and bright moon don't look like such a good combination.<<

Don't need great seeing to watch occultations.

21:03:51 Jane Houston
Hey Mark - the 6 inch "Red Dwarf" is the perfect occultation scope. The optics are great! It's easy to haul outside and it's the one I usually use for occultations! Dang! Hope you get to see something thru it! I'll be with an astronomy prof neighbor doing the Aldebaran thing in a few hours with my 10 inch homemade F7.3 Dob and binos.

21:14:17 Mark Wagner
Ooooooooooohhhhhh..... it's cloudy here. :-(

21:52:42 Bill Arnett
By 8pm here in RWC it is a better than average night for seeing. I caught the occultation of SAO 93981; now waiting for 94004 (expected at about 10:30) before 94027 (aka Alpha Tauri :-) at 11:35.

22:40:30 Jane Houston
Bummerewski! It is sooooooo clear here in central Marin! What's better than the Reggae radio hour on KPFA FM 94.1 in Berkeley, and a F7.3 homemade Dob out on the back deck looking at and sketching features on the moon!

Why after the moon sets I think I'll go after some of those Hickson quintets, septets and sextets that Steve Gottleib talks about in his excellent, well written article in this months's S&T- well maybe I can try a few of them anyway, while I do a rusty practice of Virgo objects in preparation for my Molokia Messier Marathon in March. I first saw HCG 92 - Stephan's Quintet from this very deck.

The moon is awesome tonight. Anyone up with a clearish sky shouldn't miss is. It's the stuff that dreams are made of! Gotta get back out there!

22:45:03 Bill Arnett
Indeed! Check Sinus Iridum. Right now it is two great arcs reaching out into the night. Soon the Sun will rise on their joining to form a "lunar prominence"! I just hope it happens before the Moon sets for us.

You can see it with binos!

I counted 26 craters inside Clavius earlier. The seeing has deteriorated somewhat since then but Clavius is still fabulous. And Copernicus! The only downside is my thermometer reading 35F :-(

22:51:53 Mark Wagner
> I think I'll go after some of those Hickson quintets, septets and
> sextets that

Jane, you've driven the stake in far enough for one night.... ;-)

23:24:42 David North
Bill: >>...now waiting for 94004 (expected at about 10:30)<<

Got it at 10:32 by my watch (a bit before). I was hoping for some "lag" as it was close to a graze, but nothing...

Sinus Iridum is tres cool, and the secondaries, domes and rilles around Copernicus are amazing tonight.

Also, don't miss Rima Hesiodus and the Rimae Ramsden complex in Palus Epidemarium (sorta shady but you can get it) at the end of R. Hesiodus. Not to mention that the rilles in Hesiodus themselves are showing... in the 4.5-inch!

23:35:43 David North
Aldebaran Is Gone!

11:35:45 by my watch, dead bang. No lingering at all. It just went off like a light.

No problem seeing the red tint on that sucker!

23:42:21 Jane Houston
Bill Arnett wrote:

> Indeed! Check Sinus Iridum. Right now it is two great arcs reaching
> out into the night. Soon the Sun will rise on their joining to form
> a "lunar prominence"! I just hope it happens before the Moon sets
> for us.

Sinus Iridum is one of my favorite sketching targets. Tonight with the terminator running right through the middle of the bay, the sun illuminating the mountainous arms surrounding the mountains. With the surface features like an undulating wave, visible even in binos. I'm looking at it right now. Aldebaran is closing in, too - same field of view with the moon right now! Well the shortwave radio is nowhere to be found so I'll just record my times to Bob Marley Radio.

> I counted 26 craters inside Clavius earlier. The seeing has
> deteriorated somewhat since then but Clavius is still fabulous. And
> Copernicus!

Yowza! Great count!

> The only downside is my thermometer reading 35F :-(

Here, it's a balmy 47F.

Aldebaran occultation has begun! It's 11:24:50 exactly! Gorgeous!! More on the other side. Now I'm gonna enjoy the moon for a while!

11:34:50 I meant! Just call me a lunatic!

23:45:23 Bill Arnett
Bing!

23:57:25 Jay Freeman
Aldebaran disappeared more or less on schedule, and the Moon looked more or less like a pile of rocks, which is more or less what it usually looks like...

-- Jay Freeman, Deep Sky Weasel

PS: This was the first time I had had the Brandon 98 out since I repainted it. I hope some of you will be at the SJAA meeting this Saturday, 30 January, to give me a hard time about the new color scheme.

23:58:41 David North
Jay: >>Aldebaran disappeared more or less on schedule<<

Oh, you were watching! I can't imagine why...

>>and the Moon looked more or less like a pile of rocks...<<

That's your head getting in the way.

>>I hope some of you will be at the SJAA meeting
this Saturday, 30 January, to give me a hard time about the
new color scheme.<<

Wouldn't miss it for anything.

00:03:56 Jay Freeman
> > Aldebaran disappeared more or less on schedule...

> Oh, you were watching! I can't imagine why...

I had it backwards; I thought the star was going to occult the Moon -- that would have made it nice and dark.

> > and the Moon looked more or less like a pile of rocks...

> That's your head getting in the way.

No, no, I could see right through the holes.

00:10:48 Bill Arnett
>...I thought the star was going to occult the Moon --
>that would have made it nice and dark...

We're in big trouble if a star comes between us and the Moon :-)

Now for the reappearance. Should be at about 12:37 at the same lunar latitude as Petavius.

00:12:51 Mark Wagner
> Aldebaran disappeared more or less on schedule, and the Moon looked
> more or less like a pile of rocks, which is more or less what it
> usually looks like...

But Jay.... had you taken out something more than a measely 98mm scope, you might have noticed that mag 14 UGC galaxy being occulted too ;-)

00:13:23 David North
jay: >>I thought the star was going to occult the Moon<<

You got to have a special UHC* to see that.

*Unusually Hard Cranium

00:25:32 Jane Houston
> Now for the reappearance. Should be at about 12:37 at the same lunar
> latitude as Petavius.

Ok, now who else besides me has a red night- light on (in the bathroom) to preserve your night vision?? It's nice to know that some of you are sharing the sky with me!

00:46:03 Morris Jones
At least I got to see Aldebaran reappear. Luckily Jane left behind her short-tube 80, and I found a camera tripod ...

00:48:03 Jane Houston
12:37 to the second. there it reappeared. Now everybody ( is anybody out there??) please go and look at Sinus Iridum! Be-you- tee- full Jane

00:48:01 Morris Jones
> please go and look at Sinus Iridum! Be-you- tee- full Jane

Yes, I've never quite seen anything like that.

So that's what they mean by a sinus infection.

00:50:33 Bill Arnett
>!2:37 to the second. there it reappeared.

:-) Why is something so simple so cool?

>> Ok, now who else besides me has a red night- light on (in the bathroom) to
>> preserve your night vision??

Who needs night vision for watching the Moon?

> It's nice to know that some of you are sharing the
> sky with me!

A strange way to share an evening but what the heck, it works doesn't it!