[HiDARG-MEMBERS] Nova

[Austin Smith]

>From the standpoint of a ham, the interesting point is that astronomers use this frequency to identify and observe far stars and galaxies.  Since the frequency is a matter of particle physics it will be a constant throughout the universe.  Therefore, any alien astronomer will be using the same technique and will be monitoring that frequency.  Any modulated signal or repetitive pattern of transmission (as opposed to random noise) that a ham could hear might be originating from an alien radio operator.  I believe the SETI people monitor 1,420 MHz for this very reason.  Of course, the signal might be 10,000,000 years old or more, so you are unlikely to get a response if you reply.

73,
ASm
WA5CAW



________________________________
From: HiDARG-Members <hidarg-members-bounces at hidarg.org> on behalf of Bob Weed <bweed at prodigy.net>
Sent: Thursday, August 12, 2021 10:55 AM
To: HiDARG Members <hidarg-members at hidarg.org>
Subject: Re: [HiDARG-MEMBERS] Nova

Fascinating information, Austin, even though it's over my head!

Bob, W7SCY

On Thursday, August 12, 2021, 06:06:06 AM PDT, Austin Smith <asmith73 at hotmail.com> wrote:


I don't know how broad banded the signal would be.  Following is a heavily edited quotation from the Encyclopedia Britannica.  For the full description, search for "21-centimetre radiation" or "cold hydrogen frequency".

**************
21-centimetre radiation, electromagnetic radiation of radio wavelength emitted by cold, neutral, interstellar hydrogen atoms. According to the rules of quantum mechanics, such atoms radiate their acquired energy in the form of low-energy photons that correspond to a wavelength of 21 centimetres, or a frequency of 1,420 megahertz. This transition, called a hyperfine transition, occurs roughly every 10 million years. Although the transition occurs very rarely, there is so much hydrogen in the Milky Way Galaxy that 21-centimetre hydrogen emission is easily observable. The 21-centimetre radiation readily penetrates the clouds of interstellar dust particles that obstruct optical observations deep into the galactic centre and thus allows the mapping of the galaxy’s spiral structure.
********************

73,
ASm
WA5CAW
________________________________
From: HiDARG-Members <hidarg-members-bounces at hidarg.org> on behalf of Randy Tomer <w6ra.randy at gmail.com>
Sent: Wednesday, August 11, 2021 9:56 PM
To: HiDARG Members <hidarg-members at hidarg.org>
Subject: Re: [HiDARG-MEMBERS] Nova

Would 1296 work?

Randy

On Wed, Aug 11, 2021 at 4:38 PM Austin Smith <asmith73 at hotmail.com<mailto:asmith73 at hotmail.com>> wrote:
You will need to listen on 1,420 MHz (21 cm).

73,
ASm
WA5CAW

________________________________
From: HiDARG-Members <hidarg-members-bounces at hidarg.org<mailto:hidarg-members-bounces at hidarg.org>> on behalf of Randy Tomer <w6ra.randy at gmail.com<mailto:w6ra.randy at gmail.com>>
Sent: Wednesday, August 11, 2021 11:53 AM
To: HiDARG Members <hidarg-members at hidarg.org<mailto:hidarg-members at hidarg.org>>
Subject: Re: [HiDARG-MEMBERS] Nova

Can we bounce VHF signals off of it?

73
Randy

On Mon, Aug 9, 2021 at 4:02 PM John Britt Baldwin <johnbritt.baldwin at gmail.com<mailto:johnbritt.baldwin at gmail.com>> wrote:

[https://gallery.mailchimp.com/0c5fce34d5ca05f64a13d085d/images/2c55767c-48ac-43a9-a87d-c9319458f7a9.jpg]
Space Weather News for Aug. 9, 2021
https://spaceweather.com<https://spaceweather.us11.list-manage.com/track/click?u=0c5fce34d5ca05f64a13d085d&id=7d5dd834c9&e=716ff4edb0>
https://www.spaceweatheralerts.com<https://spaceweather.us11.list-manage.com/track/click?u=0c5fce34d5ca05f64a13d085d&id=71f1cf0747&e=716ff4edb0>

RARE NAKED-EYE NOVA: Yesterday, a star in the constellation Ophiuchus exploded. Although it is 5000 light years away, the blast is bright enough to see with the unaided eye after sunset. Get the full story with observing tips at @ Spaceweather.com<https://spaceweather.us11.list-manage.com/track/click?u=0c5fce34d5ca05f64a13d085d&id=a395ebee09&e=716ff4edb0>.

Aurora Alerts: Sign up for Space Weather Alerts<https://spaceweather.us11.list-manage.com/track/click?u=0c5fce34d5ca05f64a13d085d&id=6f8f0e5f8a&e=716ff4edb0> and get instant professional notifications of auroral activity.
[https://mcusercontent.com/0c5fce34d5ca05f64a13d085d/images/b777abbd-d76a-a50d-3ffd-51c9463de9dc.jpg]<https://spaceweather.us11.list-manage.com/track/click?u=0c5fce34d5ca05f64a13d085d&id=eb9982c2f3&e=716ff4edb0>
Above: Exploding star RS Oph photographed during the early hours of Aug. 9th by Ernesto Guido, Marco Rocchetto & Adriano Valvasori. At the time, the nova's visual magnitude was +5 and it has continued to brighten since then.
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