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In the Sky this Week – April 27, 2021

By Robert Trembley  |  27 Apr 2021  |  Sacred Space Astronomy

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Mars Helicopter Flies Three Times!

The Ingenuity rovercraft has flown three times now in Mars’ atmosphere – the 3rd time lifting to 16 feet, and translating horizontally 164 feet – just over half the length of a football field!

The #MarsHelicopter is really “spreading its wings” now – even pushing beyond my camera's field of view. Watch my view of Flight #3, as Ingenuity takes off on a long run (164 ft/50 m) down its flight zone and back. https://t.co/ESQu9PIL9S pic.twitter.com/PzEoD3XoHA

— NASA's Perseverance Mars Rover (@NASAPersevere) April 25, 2021

This week, I’m attending the 2021 Planetary Defense Conference online (#2021PDC). I’ve always wanted to attend this particular conference – I’m thrilled to be able to attend remotely! One of the exercises of this conference is the “discovery” of fictitious asteroid 2021 PDC, with a 5% chance to impact the Earth. Presenters covered how impact percentages are calculated, and how they figure out impact location probabilities – all with very nice graphics! Over the course of the week, with “new observations” the impact percentage will be refined. I’ll discuss this more in my Asteroids section below.

  • The Sky
  • The Moon
  • The Sun
  • Asteroids
  • Fireballs
  • The Solar System
  • Spacecraft News
  • Exoplanets
  • Aurora
  • Light Pollution
  • The Universe

Jupiter and Saturn appear in the southeastern predawn sky all week; the Third Quarter Moon joins the pair of planets on May 3rd, and appears near the planet Saturn.

Southeastern predawn sky all week
Jupiter and Saturn in the southeastern predawn sky; on May 3rd, the Third Quarter Moon appears near Saturn. Credit: Bob Trembley / Stellarium.

The Moon appears in the early morning southern sky with the star Arcturus and Spica on April 27th.

Early morning southern sky
The Moon, Antares and Spica in the early morning southern sky on April 27th. Credit: Bob Trembley / Stellarium.

The Moon appears in conjunction with the star Antares the early morning southern sky on April 29th.

Early morning southern sky
The Moon appears in conjunction with the star Antares the early morning southern sky on April 29th. Credit: Bob Trembley / Stellarium.

Mars appears above the western horizon after sunset all week. The constellation Orion is setting with the Sun – Summer is coming!

Mars above the western horizon at sunset. Credit: Bob Trembley / Stellarium.

The Moon is a Waning Gibbous – rising after sunset, visible high in the sky after midnight, and visible to the southwest after sunrise.

The Third Quarter Moon occurs on May 3rd – rising around midnight, and visible to the south after sunrise.

Moon
The Moon from April 27 – May 3, 2021. Visualizations by Ernie Wright / NASA’s Scientific Visualization Studio.

If you click on the Moon image above, or click this link, you will go to NASA’s Moon Phase and Libration, 2021 page – it will show you what the Moon looks like right now. If you click the image on that page, you will download a high-rez TIFF image annotated with the names of prominent features – helpful for logging your lunar observations!

Moon News:

In 1968, the Apollo 8 astronauts made history by leaving low-Earth orbit and traveling to the Moon. The views of the Moon were spectacular – but the astronauts were overwhelmed by the sight of their home planet. #EarthDay#ConnectedByEarth pic.twitter.com/IBLsoPrE49

— NASA Moon (@NASAMoon) April 22, 2021

Sunspots AR2018, AR2020, and AR2021 are crowded unusually close together. Credit: SDO/HMI/SpaceWeather.com.

The Sun still has 2 spots, and something is blowing Coronal Mass Ejections toward the Earth! SpaceWeather.com reports:

“INCREASING SOLAR ACTIVITY: In the past 36 hours alone, the sun has produced 3 relatively bright coronal mass ejections (CMEs). Watch the movie. So far they are flying to the left and right of Earth, with none landing a solid blow. One of the CMEs, launched by the ‘fire fountain eruption’ described below, might weakly sideswipe Earth on April 30th, but the forecast is uncertain.

Intense coronal loop activity continues from last week; the southern coronal hole has diminished, and the northern coronal hole has grown in size.

https://sdo.gsfc.nasa.gov/assets/img/dailymov/2021/04/26/20210426_1024_0193.mp4
The Sun seen in 193 angstroms on April 26, 2021

Prominence activity, everywhere! Watch the southern hemisphere – a filament crawls over the Sun’s face!

https://sdo.gsfc.nasa.gov/assets/img/dailymov/2021/04/26/20210426_1024_0304.mp4
The Sun seen in 304 angstroms on April 26, 2021
Videos courtesy of NASA/SDO and the AIA, EVE, and HMI science teams.
You can view the Sun in near real-time, in multiple frequencies here: SDO-The Sun Now.
You can create your own time-lapse movies of the Sun here: AIA/HMI Browse Data.
You can browse all the SDO images of the Sun from 2010 to the present here: Browse SDO archive.

 

Solar Activity on Facebook – Run by Volunteer NASA/JPL Solar System Ambassador Pamela Shivak

Sun
SOLARACTIVITY PICTURE OF THE DAY for April 27th 2021 is ISS solar transit image by Mehmet Ergün. Details: “Planned 2 weeks ago, 35KG equipment, about 300 KM by car, about 10 hours of time .. Everything only for 1 second!. Equipment: DayStar Gemini, FlatCap, SharpStar 121SDQ, Rainbow RST-135, QHY174M, Baader D-ERF, TS 0,5 2” Reducer, Hinode Solar Guider, Software: Sharpcap, AS3, Registax, PS, LR, Location: Einöd / Germany. Date: 04/25/2021 11:29 UTC+2

Solar Corona

Solar wind speed is 456.4 km/sec, with a density of 3.8 protons/cm3 at 1035 UT.

Near real-time animation of the corona and solar wind from the Solar & Heliospheric Observatory (SOHO):

SOHO LASCO C2 Latest Image
Animated LASCO C2 Coronograph showing the solar corona above the Sun’s limb (the white circle). Credit: NASA/JPL-Caltech-SOHO

Sun News:

A coronal mass ejection erupted from the Sun on April 17 and passed Mars overnight on April 21-22. NASA monitors eruptions like this as they can trigger particle and radiation events that pose a risk to astronauts and sensitive spacecraft electronics. https://t.co/VR2lFPhGkA pic.twitter.com/UMe7aWH7ZB

— NASA Sun & Space (@NASASun) April 22, 2021

  • Near-Earth Objects (NEOs) discovered this month: : 61 (-204) this year: 762 (-214), all time: 25,552 (-239)
  • Potentially hazardous asteroids: 2181 (updated 2021-04-20)
  • Total Minor Planets discovered (NASA): 1,075,796 (+2226)
  • Total Minor Planets discovered (MPC): 1,069,907 (+26,860 updated 2021-04-27)

Upcoming Earth-asteroid encounters:

Asteroid Date(UT) Miss Distance Velocity (km/s) Diameter (m)
2021 GG11 2021-Apr-27 4.8 LD 14.8 84
2021 HF2 2021-Apr-27 19 LD 17.7 37
2021 GT9 2021-Apr-28 10.9 LD 5.9 17
2021 HQ1 2021-Apr-28 18.1 LD 4.5 19
2021 HH 2021-Apr-29 14.4 LD 16.5 34
2021 HU 2021-Apr-29 9.7 LD 10.9 31
2021 EZ4 2021-Apr-29 14.9 LD 2.5 21
2021 HA 2021-Apr-30 7.8 LD 5.9 27
2021 HB1 2021-Apr-30 12.2 LD 10.7 33
2021 HA3 2021-Apr-30 7.8 LD 13.7 67
2019 VT3 2021-May-01 12.1 LD 5.9 8
2021 HH1 2021-May-01 16.2 LD 15.2 76
2021 HT1 2021-May-03 13.4 LD 11.3 19
2021 AF8 2021-May-04 8.8 LD 9.4 344
2018 JP 2021-May-05 10.7 LD 7.8 12
2021 AE4 2021-May-06 18.5 LD 9.1 153
2021 HF1 2021-May-07 12.4 LD 2.8 10
2021 GM10 2021-May-10 12.7 LD 5.8 37
2021 GK1 2021-May-11 1.5 LD 2 13
2015 KJ19 2021-May-14 15.1 LD 23 118
478784 2021-May-18 15.8 LD 5 27
2021 HJ2 2021-May-22 16.1 LD 8.2 69
2021 FN4 2021-May-24 6.1 LD 8.3 86
2013 VO11 2021-May-25 3.5 LD 10.2 8
2018 LB 2021-Jun-01 2.9 LD 7.7 22
Notes: LD means “Lunar Distance.” 1 LD = 384,401 km, the distance between Earth and the Moon. Table from SpaceWeather.com

Asteroid News: Planetary Defence Conference 2021

I mentioned in the intro that I’m attending this conference online – I’ve been listening to day #2 while I been writing this post.

Starting Day 2 of the Planetary Defence Conference 2021!
In focus today, legal & policy issues, disruption and deflection options.
Follow the discussion through link 👉 https://t.co/0xT7qewRPQ#2021PDC pic.twitter.com/LedqGDJB2C

— UNOOSA (@UNOOSA) April 27, 2021

As I mentioned above, an ongoing feature of the convention is the discovery of a fictitious asteroid with a possibility of impacting the Earth. Presenters showed several graphics and an Imperial Boatload of statistics!

Polls were given to attendees after each presentation – I groused in chat the the 2nd poll question was “unfair,” because (A) a 5% chance might indeed be low (but I’m going to worry about it anyway), and (C) 6 months IS WAY too short of a time to mount a deflection mission to the asteroid from scratch. Option (B) mentioned Bruce Willis… and got the squinty eye from me.

Who makes the Announcement?

An interesting topic that came up was that with social media, the information about a potential asteroid impact will be available online before the International Asteroid Warning Network (IAWN) or any of its signatories have time to event comment. It may be very easy to “lose the narrative” with the widespread propensity for misinformation; how do “we” (the scientists) get the narrative back? Who will be the “Expert Voices” for different countries?

One of the scientists was asked if any of their models took into account the economic impact of the announcement of an imminent impact – she answered NO, their task was to refine impact probabilities and calculate populations affected; economic considerations was not their job… I had to think: “Not my circus, not my monkeys!”

How would you avoid panic, with only 6 months notice? A lot of the bits are NOT in place yet. Not knowing how the decisions will be made is frustrating to scientists.

Something that was not brought up was possible (almost certain) politicizing of an imminent impact.

Two asteroid missions were discussed:

DART Mission – what I found interesting was WHY the double asteroid was chosen: because it will be much quicker to see how much the orbit of the impactee has changed after the impact -vs- a Sun-orbiting asteroid, which could take months or years to determine any change.

OSIRIS-Rex mission – where some interesting aspects of cratering resulting from different size and velocity impactors were covered. BOY, was there a LOT of technical talk!

Oh my goodness! They are talking about NUKES! as I am listening right now! They are discussing how much mass could be launched and delivered to an incoming asteroid in a short period of time, and the myriad legal aspects of nuclear devices in space.

On April 26, 2021, the NASA All Sky Fireball Network reported 3 fireballs!
(3 sporadics)

In this diagram of the inner solar system, all of the fireball orbits intersect at a single point–Earth. The orbits are color-coded by velocity, from slow (red) to fast (blue). Credit: SpaceWeather.com

Fireball News:

Wow! Looks like this is also on the @amsmeteors Pending Reports Fireball Log. 💫 @BaileyA71989494 https://t.co/hp0cTv0DUk

— Jaime Brush, M.S. (@jaime_brush) April 24, 2021

If you see a bright meteor or a fireball, please REPORT IT to the American Meteor Society and the International Meteor Organization!

Position of the planets & several spacecraft in the inner solar system on April 27th.

Inner Solar System
Position of the planets and several spacecraft in the inner solar system on April 27th, 2021 – the orbit of comet 67/P Churyumov-Gerasimenko is highlighted. Credit: Bob Trembley / NASA Eyes on the Solar System

Position of the planets in the middle solar system:

Middle Solar System
Position of the planets in the middle solar system on April 27th, 2021 – the orbit of dwarf planet Ceres is highlighted. Credit: Bob Trembley / NASA Eyes on the Solar System.

Position of the planets, and a several transneptunian objects in the outer solar system.

Outer Solar System
Position of the planets and several transneptunian objects (TNO) in the outer solar system on April 27th, 2021- the orbit of TNO Arrokoth is highlighted. Credit: Bob Trembley / NASA Eyes on the Solar System

International Space Station:

The @SpaceX #CrewDragon Endeavour with four astronauts approaches the station less than one day after launching from @NASAKennedy. More pix… https://t.co/LqHZaG3ny4 pic.twitter.com/lGrX526QSl

— International Space Station (@Space_Station) April 27, 2021

Two @SpaceX #CrewDragon vehicles are docked to the station for the first time. It's also the second visit for Crew-2 Endeavour. More… https://t.co/c6G2Zu14dW pic.twitter.com/ZrC0pZEG9R

— International Space Station (@Space_Station) April 24, 2021

HiRISE – on the Mars Reconnaissance Orbiter:

HiPOD 26 Apr 21: Exposure of Rocky Fill in Roemer Crater

This image highlights relief of the rocky fill in an ancient, 120-km diameter impact crater in Noachis Terra. The crater was recently named for @uarizona astronomer Elizabeth Roemer (1929-2016).https://t.co/aXpPZ47i3p pic.twitter.com/JSZtrjaYoq

— HiRISE: Beautiful Mars (NASA) (@HiRISE) April 26, 2021

Hubble Space Telescope:

The interaction of two doomed stars has created this diamond necklace of cosmic proportions (the Necklace Nebula) featured in our latest Picture of the Week.

🔗 https://t.co/KuyP4PVxOT

Credit: @ESA / @Hubble_Space / @NASA , K. Noll pic.twitter.com/4XnDnFVx6T

— HUBBLE (@HUBBLE_space) April 26, 2021

Landsat:

More than 100 million cubic meters of ash spewed from a volcano on the Caribbean island of St. Vincent recently. The darkened western coastline in a @USGSLandsat image captured Sunday offers a sense of the ash’s extent.
Find imagery at https://t.co/86O1czz4SR pic.twitter.com/qViPUv4ZbQ

— Earth Resources Observation and Science Center (@USGS_EROS) April 26, 2021

Climate:

From Alaska to the Maldives, changes in one part of our home planet affect another, because we're all #ConnectedByEarth. Here are beautiful @NASA images of major places that have experienced change, from ice melt to sea level rise to coral bleaching and hurricanes. #EarthDay2021 pic.twitter.com/LuQIYXtq7q

— NASA Climate (@NASAClimate) April 22, 2021

See a list of current NASA missions here: https://www.jpl.nasa.gov/missions/?type=current

Exoplanet

ex·o·plan·et /ˈeksōˌplanət/, noun: a planet orbiting a star other than the Sun.

All Exoplanets 4375
Confirmed Planets Discovered by Kepler 2394
Kepler Project Candidates Yet To Be Confirmed 2366
Confirmed Planets Discovered by K2 426
K2 Candidates Yet To Be Confirmed 889
Confirmed Planets Discovered by TESS 122
TESS Project Candidates Integrated into Archive (2021-03-27 13:00:02) 2647  (+2)
Current date TESS Project Candidates at ExoFOP 2647  (+2)
TESS Candidates Yet To Be Confirmed 1448 (-5)

Data from the NASA Exoplanet Archive
* Confirmed Planets Discovered by TESS refers to the number planets that have been published in the refereed astronomical literature.
* TESS Project Candidates refers to the total number of transit-like events that appear to be astrophysical in origin, including false positives as identified by the TESS Project.
* TESS Project Candidates Yet To Be Confirmed refers to the number of TESS Project Candidates that have not yet been dispositioned as a Confirmed Planet or False Positive.

Exoplanet News

We've discovered thousands of exoplanets (planets beyond our solar system).
🌋 Lava planets? ✅
🥚Egg-shaped worlds✅
☀️☀️Planets with multiple suns✅
⚫️Planets with no sun at all! ✅https://t.co/pU45zxl1xx pic.twitter.com/cEfVpFEDP2

— NASA Exoplanets (@NASAExoplanets) April 26, 2021

Visit NASA’s Eyes on Exoplanets site and explore exoplanets in 3D: https://eyes.nasa.gov/apps/exo/#/

Aurora Borealis. Taken by Harlan Thomas  on April 25, 2021 @ NorthWest of Calgary, Alberta

SpaceWeather.com Realtime Aurora Gallery: https://spaceweathergallery.com/aurora_gallery.html

Teaming up with @IDADarkSky and @denveraudubon, @AudubonRockies has launched Lights Out Colorado—a new program making it safer for the millions of birds that migrate through and to Colorado. Learn why it’s critical to turn off lights and how you can help. https://t.co/DBSP3TtX8w

— Audubon Society (@audubonsociety) April 26, 2021

There has been explosive growth in the commercial greenhouse industry, contributing significantly to light pollution.

On the IDA blog, @KWalzar explains: "This technology can benefit society, but it doesn’t need to be at the expense of the night." https://t.co/QiuYWh2eBA

— IDA Dark-Sky (@IDADarkSky) April 26, 2021

Visit an International Dark Sky Park: https://www.darksky.org/our-work/conservation/idsp/parks/

If you live in Michigan, visit the Michigan Dark Skies site: https://sites.lsa.umich.edu/darkskies/

Hubble – Beautiful Universe: NGC 1300

NGC 1300. Credits: NASA, ESA, and The Hubble Heritage Team (STScI/AURA);
Acknowledgment: P. Knezek (WIYN)

One of the largest Hubble Space Telescope images ever made of a complete galaxy is being unveiled today at the American Astronomical Society meeting in San Diego, Calif.

The Hubble telescope captured a display of starlight, glowing gas, and silhouetted dark clouds of interstellar dust in this 4-foot-by-8-foot image of the barred spiral galaxy NGC 1300. NGC 1300 is considered to be prototypical of barred spiral galaxies. Barred spirals differ from normal spiral galaxies in that the arms of the galaxy do not spiral all the way into the center, but are connected to the two ends of a straight bar of stars containing the nucleus at its center.

At Hubble’s resolution, a myriad of fine details, some of which have never before been seen, is seen throughout the galaxy’s arms, disk, bulge, and nucleus. Blue and red supergiant stars, star clusters, and star-forming regions are well resolved across the spiral arms, and dust lanes trace out fine structures in the disk and bar. Numerous more distant galaxies are visible in the background, and are seen even through the densest regions of NGC 1300.

In the core of the larger spiral structure of NGC 1300, the nucleus shows its own extraordinary and distinct “grand-design” spiral structure that is about 3,300 light-years (1 kiloparsec) long. Only galaxies with large-scale bars appear to have these grand-design inner disks – a spiral within a spiral. Models suggest that the gas in a bar can be funneled inwards, and then spiral into the center through the grand-design disk, where it can potentially fuel a central black hole. NGC 1300 is not known to have an active nucleus, however, indicating either that there is no black hole, or that it is not accreting matter.

The image was constructed from exposures taken in September 2004 by the Advanced Camera for Surveys onboard Hubble in four filters. Starlight and dust are seen in blue, visible, and infrared light. Bright star clusters are highlighted in red by their associated emission from glowing hydrogen gas. Due to the galaxy’s large size, two adjacent pointings of the telescope were necessary to cover the extent of the spiral arms. The galaxy lies roughly 69 million light-years away (21 megaparsecs) in the direction of the constellation Eridanus.

– NASA/ESA.


Stay safe, be well, and look up!


Software Apps used for this post:

NASA Eyes on the Solar System: an immersive 3D solar system and space mission simulator – free for the PC /MAC. I maintain the unofficial NASA Eyes Facebook page.
SpaceEngine: a free 3D Universe Simulator for Windows. Steam version with VR support available.
Stellarium: a free open source planetarium app for PC/MAC/Linux. It’s a great tool for planning observing sessions. A web-based version of Stellarium is also available.


Section header image credits:
The Sky – Stellarium / Bob Trembley
Observing Target – Turn Left at Orion / M. Skirvin
The Moon – NASA/JPL-Caltech
The Sun – NASA/JPL-Caltech
Asteroids – NASA/JPL-Caltech
Fireballs – Credited to YouTube
Comets – Comet P/Halley, March 8, 1986, W. Liller
The Solar System – NASA Eyes on the Solar System / Bob Trembley
Spacecraft News – NASA Eyes on the Solar System / Bob Trembley
Exoplanets – Space Engine / Bob Trembley
Light Pollution – NASA’s Black Marble
Aurora – Bob Trembley
The Universe – Universe Today

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