#Narrowband

[shaythempronouns]

IC 5070 - the Pelican Nebula (SHO)

One of the brightest targets in the late summer sky, and a great target for narrowband, as it's bright across all three common astronomical emission bands (sulfur, hydrogen, and oxygen)

Shot at 600mm (f/4) with a Newtonian telescope from Bortle 7 skies. Total integration time: 8 hours (2h Sii, 2h Ha, 4h Oiii)

[vainaspaver]

Elephants Trunk Nebula by huntapix

[still-searching-for-et]

SH2-174. The Valentine Rose Nebula. 32hrs of exposure from my backyard.

Some controversy over what the nature of the nebula is. Great scientific study in the below article.

https://iopscience.iop.org/article/10.1088/0004-637X/799/2/198/meta

My acquisition details:

https://astrob.in/57cgka/0/

[the0phrastus]

I spent most of the night capturing OIII (Oxygen 3) and SII (Sulfur 2) data in the IC1396 region in Cepheus, enough to combine with last week's Ha (Hydrogen-alpha) data to create a SHO color image, mapping sulfur to red, hydrogen to green, and oxygen to blue in RGB. I've balanced the RGB intensity, but left green for Ha a bit higher. Hydrogen is the most abundant element in the universe—by a very wide margin, and without balancing the Ha, OIII, SII channel values, most nebulae would be overwhelmingly green. That said, I do like to keep more hydrogen green in my images, making them a bit truer to the emission values of most deep sky objects.

[guelfoalexander]

https://ui.adsabs.harvard.edu/abs/1993ApJ…415..218H/abstract

Five Years of Project META: an All-Sky Narrow-Band Radio Search for Extraterrestrial Signals

Horowitz, Paul

Sagan, Carl

Abstract:

We have conducted a five-year search of the northern sky (delta between 30 and 60 deg) for narrow-band radio signals near the 1420 MHz line of neutral hydrogen, and its second harmonic, using an 8.4 x 10 exp 6 channel Fourier spectrometer of 0.05 Hz resolution and 400 kHz instantaneous bandwidth. The observing frequency was corrected both for motions with respect to three astronomical inertial frames, and for the effect of Earth's rotation, which provides a characteristic changing Doppler signature for narrow-band signals of extraterrestrial origin. Among the 6 x 10 exp 13 spectral channels searched, we have found 37 candidate events exceeding the average detection threshold of 1.7 x 10 exp -23 W/sq m, none of which was detected upon reobservation. The strongest of these appear to be dominated by rare processor errors. However, the strongest signals that survive culling for terrestrial interference lie in or near the Galactic plane. We describe the search and candidate events, and set limits on the prevalence of supercivilizations transmitting Doppler-precompensated beacons at H I or its second harmonic. We conclude with recommendations for future searches, based upon these findings, and a description of our next-generation search system.

Publication: 

Astrophysical Journal v.415, p.218 Pub Date: September 1993  DOI: 10.1086/173157   

[chandupalle]

Narrowband IoT (NB-IoT) Chipset Market Size, Share, Industry Report & Trend Analysis

[wishtree123]

Global Narrowband IoT (NB-IoT) Market - WishTree Insight

Global Narrowband IoT (NB-IoT) Market - Market Size, Share & Industry Trends, Growth Analysis Report by Product Type, By Consumption and Forecast 2022 – 2032. Narrowband IoT (NB-IoT) is a low-power wide-area network (LPWAN) technology that is specifically designed for Internet of Things (IoT) devices and applications.

For more details visit: https://wishtreeinsight.com/reports-details/global-narrowband-iot-nb-iot-market-wishtree-insight

[pebblegalaxy]

Keysight Launches E7515R Solution for CIoT Technologies, Including 5G RedCap

Keysight Technologies, a leading technology company, has launched a wireless test platform designed specifically for all cellular internet of things (CIoT) technologies, including the 5G RedCap specification. The E7515R solution is a network emulation platform that provides chipset, device, and module makers with streamlined capabilities for RedCap without the additional features needed to test a…

[inefekt]

Summer Milky Way at Lake Ninan, Western Australia

Nikon d810a - 50mm - ISO 6400 - f/2.8 Foreground: 13 x 10 seconds Sky: 43 x 30 seconds iOptron SkyTracker Nantong Foric H-Alpha 20nm narrowband filter

[shaythempronouns]

IC 5146 - the Cocoon Nebula (HaRGB)

An especially fun target to shoot, because it's a combination emission and reflection nebula. The red in its center is ionized hydrogen, which emits a deep red glow, but the areas around the nebula with fewer stars are filled with dust, which reflects nearby starlight to produce the pale blue glow at the nebula's apparent edges.

Shot at 1600mm with a 200mm RC telescope and a ZWO ASI533MM Pro. 2h of Ha integrated exposure time, plus 1h each of RGB data.

All images on my blog, unless noted, are shot from my backyard in Bortle 7 skies.

[apod]

2024 September 17

Melotte 15 in the Heart Nebula Image Credit & Copyright: Richard McInnis

Explanation: Cosmic clouds form fantastic shapes in the central regions of emission nebula IC 1805. The clouds are sculpted by stellar winds and radiation from massive hot stars in the nebula's newborn star cluster, Melotte 15. About 1.5 million years young, the cluster stars are scattered in this colorful skyscape, along with dark dust clouds in silhouette against glowing atomic gas. A composite of narrowband and broadband telescopic images, the view spans about 15 light-years and includes emission from ionized hydrogen, sulfur, and oxygen atoms mapped to green, red, and blue hues in the popular Hubble Palette. Wider field images reveal that IC 1805's simpler, overall outline suggests its popular name - the Heart Nebula. IC 1805 is located about 7,500 light years away toward the boastful constellation Cassiopeia.

∞ Source: apod.nasa.gov/apod/ap240917.html

[thefirststarr]

Blown by fast winds from a hot, massive star, this cosmic bubble is huge. SH2-308, also known as The Dolphin-head Nebula, is cataloged as Sharpless 2-308 and lies 5,000 light-years away toward the constellation Canis Major and covers a diameter of 60 light-years at its estimated distance. The massive star that created the bubble, a Wolf-Rayet star, is the bright one near the center of the nebula. Wolf-Rayet stars have over 20 times the mass of the Sun and are thought to be in a brief, pre-supernova phase of massive star evolution. Fast winds from this Wolf-Rayet star create the bubble-shaped nebula as they sweep up slower moving material from an earlier phase of evolution. The windblown nebula has an age of about 70,000 years. Relatively faint emission captured by narrowband filters in the deep image is dominated by the glow of ionized oxygen atoms mapped to a blue hue.

Image Credit & Copyright: Prabhu Kutti

[theofficialastronomy101]

The first photo shows the Sun's chromosphere in stunning 250MP 8K. This is the hydrogen alpha wavelength and requires a very narrowband filter that notches out every other wavelength except Ha. In this view you see solar flares, prominences on the limb and surface activity. The second is a photo of the Sun's photosphere, which is the view we get using a regular broadband filter. In this view, we see sunspots, granulation and faculae.

[the0phrastus]

Orion Core in hydrogen-alpha: two-panel mosaic of Orion's Belt, the Horsehead Nebula, and M42, the Orion Nebula--and everything going on around these. This is a big chunk of space and the center of the Constellation Orion. The three bright stars in a line on the left is Orion's Belt. ZWO ASI2600MM-Pro, 3nm Ha, William Optics SpaceCat51 Apo refractor. My astro stuff here: https://SaltwaterWitch.com