Astronomers Warn Starlink Satellites Could Have a 'Fatal' Impact on Astrophotography - PetaPixel | Canada News Media
Connect with us

Science

Astronomers Warn Starlink Satellites Could Have a 'Fatal' Impact on Astrophotography – PetaPixel

Published

 on


Hundreds of astronomers, satellite operators, and dark-sky advocates recently joined forces to call out a problem that impacts all three groups: the growing number of SpaceX ‘Starlink‘ satellites in orbit, and how these ‘constellations’ could actively hurt scientific progress and have a ‘fatal’ impact on some forms of astrophotography.

If you’ve been following PetaPixel for any length of time, you’ve already seen this issue crop up. We first reported on it in March, when NASA published a similar warning, and just last month a photographer’s image of comet Neowise went viral after it was ruined by light trails from the SpaceX satellites.

But this week’s report from the Satellite Constellations 1 (SATCON1) workshop offers a more comprehensive description of the issue at hand, why it’s a problem, how it’s a problem, and what regulators and satellite manufacturers can do to help.

The full report runs to 108 pages, including a great deal of technical detail on the challenges inherent in trying to either avoid or automatically remove the light trails caused by these satellite constellations, as well as the scale of the problem. For some the impact is described as “negligible,” for others it’s “fatal.”

And while most of the report concerns itself with the impact on scientific observations, they do address photography… and the news isn’t great. According to the report, the impact on “narrow-field” astrophotography using telescopes and telephoto lenses is rated as “significant but (potentially) tolerable,” but for wide-angle shooters the impact is worse:

A significant fraction of night photography is now done with wide-angle lenses that capture wide swaths of the sky. Also, most images are also created with relatively long shutter speeds ranging from 15-30 seconds for static cameras to many minutes on tracking mounts.

[…]

Given an average of two satellite trails per square degree per 60-second exposures near the horizon, as indicated by simulations, we do not see how wide-field astrophotography can be performed to current standards with the projected density and brightness of the steady-state configurations of the Starlink2 and OneWeb constellations. We rate this impact as fatal.

A wide-field image (2.3 degrees across) from the Dark Energy Camera on the Víctor M. Blanco 4-m telescope at the Cerro Tololo InterAmerican Observatory, on 18 November 2019. Several Starlink satellites crossed the field of view. | Image Credit: DECam DELVE Survey/CTIO/AURA/NSF.

In the end, the astronomers offer nine potential solutions to the low-Earth orbit satellite (LEOsat) problem:

  1. Fewer satellites
  2. Fainter satellites
  3. Lower-altitude satellites
  4. Smaller satellites
  5. Satellites that are visible in a smaller fraction of the nighttime
  6. High-precision satellite attitude information
  7. Improved scheduling capabilities for observatories
  8. Improved image processing capabilities
  9. Novel sensors for the future

Some of these are less practical than others, and a proper solution will probably involve a mixture of several. Whatever we do, the astronomers want to make this clear that this is an important issue, and one that needs to be addressed if we don’t want to significantly hamper scientific discovery using ground-based telescopes… as well as astrophotography.

Sure, that last one is a bit of an “add-on” problem, but for the readers of this site, we’d sure like it taken into consideration.

(via DPReview)


Image credits: Header photo by Paxton Tomko, CC0

Let’s block ads! (Why?)



Source link

Continue Reading

Science

The body of a Ugandan Olympic athlete who was set on fire by her partner is received by family

Published

 on

 

NAIROBI, Kenya (AP) — The body of Ugandan Olympic athlete Rebecca Cheptegei — who died after being set on fire by her partner in Kenya — was received Friday by family and anti-femicide crusaders, ahead of her burial a day later.

Cheptegei’s family met with dozens of activists Friday who had marched to the Moi Teaching and Referral Hospital’s morgue in the western city of Eldoret while chanting anti-femicide slogans.

She is the fourth female athlete to have been killed by her partner in Kenya in yet another case of gender-based violence in recent years.

Viola Cheptoo, the founder of Tirop Angels – an organization that was formed in honor of athlete Agnes Tirop, who was stabbed to death in 2021, said stakeholders need to ensure this is the last death of an athlete due to gender-based violence.

“We are here to say that enough is enough, we are tired of burying our sisters due to GBV,” she said.

It was a somber mood at the morgue as athletes and family members viewed Cheptegei’s body which sustained 80% of burns after she was doused with gasoline by her partner Dickson Ndiema. Ndiema sustained 30% burns on his body and later succumbed.

Ndiema and Cheptegei were said to have quarreled over a piece of land that the athlete bought in Kenya, according to a report filed by the local chief.

Cheptegei competed in the women’s marathon at the Paris Olympics less than a month before the attack. She finished in 44th place.

Cheptegei’s father, Joseph, said that the body will make a brief stop at their home in the Endebess area before proceeding to Bukwo in eastern Uganda for a night vigil and burial on Saturday.

“We are in the final part of giving my daughter the last respect,” a visibly distraught Joseph said.

He told reporters last week that Ndiema was stalking and threatening Cheptegei and the family had informed police.

Kenya’s high rates of violence against women have prompted marches by ordinary citizens in towns and cities this year.

Four in 10 women or an estimated 41% of dating or married Kenyan women have experienced physical or sexual violence perpetrated by their current or most recent partner, according to the Kenya Demographic and Health Survey 2022.

The Canadian Press. All rights reserved.

Source link

Continue Reading

News

The ancient jar smashed by a 4-year-old is back on display at an Israeli museum after repair

Published

 on

 

TEL AVIV, Israel (AP) — A rare Bronze-Era jar accidentally smashed by a 4-year-old visiting a museum was back on display Wednesday after restoration experts were able to carefully piece the artifact back together.

Last month, a family from northern Israel was visiting the museum when their youngest son tipped over the jar, which smashed into pieces.

Alex Geller, the boy’s father, said his son — the youngest of three — is exceptionally curious, and that the moment he heard the crash, “please let that not be my child” was the first thought that raced through his head.

The jar has been on display at the Hecht Museum in Haifa for 35 years. It was one of the only containers of its size and from that period still complete when it was discovered.

The Bronze Age jar is one of many artifacts exhibited out in the open, part of the Hecht Museum’s vision of letting visitors explore history without glass barriers, said Inbal Rivlin, the director of the museum, which is associated with Haifa University in northern Israel.

It was likely used to hold wine or oil, and dates back to between 2200 and 1500 B.C.

Rivlin and the museum decided to turn the moment, which captured international attention, into a teaching moment, inviting the Geller family back for a special visit and hands-on activity to illustrate the restoration process.

Rivlin added that the incident provided a welcome distraction from the ongoing war in Gaza. “Well, he’s just a kid. So I think that somehow it touches the heart of the people in Israel and around the world,“ said Rivlin.

Roee Shafir, a restoration expert at the museum, said the repairs would be fairly simple, as the pieces were from a single, complete jar. Archaeologists often face the more daunting task of sifting through piles of shards from multiple objects and trying to piece them together.

Experts used 3D technology, hi-resolution videos, and special glue to painstakingly reconstruct the large jar.

Less than two weeks after it broke, the jar went back on display at the museum. The gluing process left small hairline cracks, and a few pieces are missing, but the jar’s impressive size remains.

The only noticeable difference in the exhibit was a new sign reading “please don’t touch.”

The Canadian Press. All rights reserved.

Source link

Continue Reading

News

B.C. sets up a panel on bear deaths, will review conservation officer training

Published

 on

 

VICTORIA – The British Columbia government is partnering with a bear welfare group to reduce the number of bears being euthanized in the province.

Nicholas Scapillati, executive director of Grizzly Bear Foundation, said Monday that it comes after months-long discussions with the province on how to protect bears, with the goal to give the animals a “better and second chance at life in the wild.”

Scapillati said what’s exciting about the project is that the government is open to working with outside experts and the public.

“So, they’ll be working through Indigenous knowledge and scientific understanding, bringing in the latest techniques and training expertise from leading experts,” he said in an interview.

B.C. government data show conservation officers destroyed 603 black bears and 23 grizzly bears in 2023, while 154 black bears were killed by officers in the first six months of this year.

Scapillati said the group will publish a report with recommendations by next spring, while an independent oversight committee will be set up to review all bear encounters with conservation officers to provide advice to the government.

Environment Minister George Heyman said in a statement that they are looking for new ways to ensure conservation officers “have the trust of the communities they serve,” and the panel will make recommendations to enhance officer training and improve policies.

Lesley Fox, with the wildlife protection group The Fur-Bearers, said they’ve been calling for such a committee for decades.

“This move demonstrates the government is listening,” said Fox. “I suspect, because of the impending election, their listening skills are potentially a little sharper than they normally are.”

Fox said the partnership came from “a place of long frustration” as provincial conservation officers kill more than 500 black bears every year on average, and the public is “no longer tolerating this kind of approach.”

“I think that the conservation officer service and the B.C. government are aware they need to change, and certainly the public has been asking for it,” said Fox.

Fox said there’s a lot of optimism about the new partnership, but, as with any government, there will likely be a lot of red tape to get through.

“I think speed is going to be important, whether or not the committee has the ability to make change and make change relatively quickly without having to study an issue to death, ” said Fox.

This report by The Canadian Press was first published Sept. 9, 2024.

The Canadian Press. All rights reserved.

Source link

Continue Reading

Trending

Exit mobile version