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#spectrum

2 posts1 participant0 posts today
TomKrajci 🇺🇦 🏳️‍🌈 🏳️‍⚧️

Will I find weird star colors in non-typical stars?

1st photo - Zeta Herculis and Beta Draconis - high metallicity stars. North is to the left and captures the keystone asterism in Hercules in the upper right of the frame and the head of Draco in the lower left. High metallicity stars have more absorption features in their spectra compared to low metallicity stars.

To my eye, they don't exhibit weird color that is different than all the other stars in the frame.

en.wikipedia.org/wiki/Metallic

2nd photo - finder chart with these two stars circled in red.

3rd photo - Omicron Draconis is a star with emission lines in its spectrum. It's an RS Canum Venaticorum type of star and that is one of their defining characteristics. Again, it's color does not stand out as weird.

en.wikipedia.org/wiki/Emission

4th photo - finder chart.

I plan to image other emission line stars after monsoon ends.

#NewMexico#Photography#Astrophotography
TomKrajci 🇺🇦 🏳️‍🌈 🏳️‍⚧️

A star with a weird color - Nova Lupi 2025 (V462 Lupi)

1st photo is not annotated. Can you find the nova?

2nd photo is annotated.

3rd photo was deliberately mis-focused so that stars were larger disks instead of small points. This makes it easier to see the color.

Note that there are plenty of orange stars and plenty of blue stars...but the nova has a unique color. To my eye it's a pale purple.

Why does the nova have a weird color?

4th image was taken from facebook.com/photo/?fbid=17712 it's a spectrum of the nova. Most stars have a blackbody radiation distribution, but novae (that's the Latin form, plural) have strong emission lines at discrete colors. That can make a weird color compared to most stars.

Image taken with a camera on a fixed tripod.

en.wikipedia.org/wiki/V462_Lup

#Nova#Photography#Astrophotography
Replied in thread
Kevin Karhan :verified:

@stman @vidak @50htz @theruran @forthy42 I don't think #RONJA's development was actively sabotaged.

In fact, @BNetzA did extend frequency allocations for #BFWA useage and dedicaded the 5,8 GHz band to to #WISP|s that want to provide #broadband in rural areas.

  • So it's not the fault of RONJA or it's devs, but the fault of WiFi and proprietary solutions to have caught up.

Personally, I do wish for #OpticalLinks more because they are not just less prone to eavesdropping, but also less taxing on the increasingly scarce resource that is #RadioSpectrum and that we should be more mindful of, espechally since the solution to overcrowded #spectrum is rather obnoxious as in "dialing up power consumption to implement ever more complex coding schemes"...

  • Not to mention it's easier to secure an optical link and I think that it would be best if said system could universally tunnel any data, from Serial to USB and from 10/100M Ethernet to anything else, as having a "Universal Visible-light Optical Link" (maybe even call it "#UVOL", cuz "VOL" and "UVLOL" or "ULOL" may be too much of a bad take) could really do wounders.

Even if it can only do like 12Mbit/s for USB 2.0 it'll still be practical for many use-cases.

  • As you said: You want to focus on the "modem" part first...
Ubiquiti Store airFiber 60 Long-Range - Ubiquiti StoreLong-range 60 GHz radio system that pairs in PtP mode or connects to a Wave AP as a client in PtMP mode.
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