#1998ky26 — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #1998ky26, aggregated by home.social.
-
2026-09-12 15:00:00 UTC (Delta: 2026-09-05)
WHERE IS HAYABUSA2♯?
- Barycentric speed: 28.64 km/s (-0.51 km/s)
- Earth flyby: December 2027🪨 Relative to 1998 KY26
- Distance (km): 199,354,400.75 km (+9,026,981.48 km)
- Distance (AU): 1.33 (+0.06)
- Light travel time: 11 min 4.97 s (+30.11 s)🌎 Relative to Earth
- Distance (km): 65,166,423.93 km (+580,881.27 km)
- Distance (AU): 0.44 (+0.00)
- Light travel time: 3 min 37.37 s (+1.94 s) -
2026-09-05 15:00:00 UTC (Delta: 2026-08-29)
WHERE IS HAYABUSA2♯?
- Barycentric speed: 29.15 km/s (-0.56 km/s)
- Earth flyby: December 2027🪨 Relative to 1998 KY26
- Distance (km): 190,327,419.27 km (+8,274,613.91 km)
- Distance (AU): 1.27 (+0.06)
- Light travel time: 10 min 34.86 s (+27.60 s)🌎 Relative to Earth
- Distance (km): 64,585,542.67 km (-135,866.45 km)
- Distance (AU): 0.43 (-0.00)
- Light travel time: 3 min 35.43 s (-0.45 s) -
2026-08-29 15:00:00 UTC (Delta: 2026-08-22)
WHERE IS HAYABUSA2♯?
- Barycentric speed: 29.72 km/s (-0.61 km/s)
- Earth flyby: December 2027🪨 Relative to 1998 KY26
- Distance (km): 619,939,442.50 km (-4,671,036.16 km)
- Distance (AU): 4.14 (-0.03)
- Light travel time: 34 min 27.90 s (-15.58 s)🌎 Relative to Earth
- Distance (km): 64,714,917.79 km (-927,666.25 km)
- Distance (AU): 0.43 (-0.01)
- Light travel time: 3 min 35.87 s (-3.09 s) -
2026-08-22 15:00:00 UTC (Delta: 2026-08-15)
WHERE IS HAYABUSA2♯?
- Barycentric speed: 30.33 km/s (-0.65 km/s)
- Earth flyby: December 2027🪨 Relative to 1998 KY26
- Distance (km): 427,768,183.27 km (-11,742,340.57 km)
- Distance (AU): 2.86 (-0.08)
- Light travel time: 23 min 46.88 s (-39.17 s)🌎 Relative to Earth
- Distance (km): 65,642,584.04 km (-1,760,516.16 km)
- Distance (AU): 0.44 (-0.01)
- Light travel time: 3 min 38.96 s (-5.87 s) -
2026-08-15 15:00:00 UTC (Delta: 2026-08-08)
WHERE IS HAYABUSA2♯?
- Barycentric speed: 30.98 km/s (-0.68 km/s)
- Earth flyby: December 2027🪨 Relative to 1998 KY26
- Distance (km): 356,633,563.10 km (+3,640,160.74 km)
- Distance (AU): 2.38 (+0.02)
- Light travel time: 19 min 49.60 s (+12.14 s)🌎 Relative to Earth
- Distance (km): 67,403,100.20 km (-2,622,650.05 km)
- Distance (AU): 0.45 (-0.02)
- Light travel time: 3 min 44.83 s (-8.75 s) -
2026-08-08 15:00:00 UTC (Delta: 2026-08-01)
WHERE IS HAYABUSA2♯?
- Barycentric speed: 31.66 km/s (-0.70 km/s)
- Earth flyby: December 2027🪨 Relative to 1998 KY26
- Distance (km): 352,993,402.36 km (+4,469,759.25 km)
- Distance (AU): 2.36 (+0.03)
- Light travel time: 19 min 37.50 s (+14.91 s)🌎 Relative to Earth
- Distance (km): 70,025,750.24 km (-3,502,913.77 km)
- Distance (AU): 0.47 (-0.02)
- Light travel time: 3 min 53.59 s (-11.68 s) -
2026-08-01 15:00:00 UTC (Delta: 2026-07-25)
WHERE IS HAYABUSA2♯?
- Barycentric speed: 32.34 km/s (-0.71 km/s)
- Earth flyby: December 2027🪨 Relative to 1998 KY26
- Distance (km): 348,505,782.60 km (+5,338,412.52 km)
- Distance (AU): 2.33 (+0.04)
- Light travel time: 19 min 22.53 s (+17.81 s)🌎 Relative to Earth
- Distance (km): 73,554,265.01 km (-4,359,482.27 km)
- Distance (AU): 0.49 (-0.03)
- Light travel time: 4 min 5.36 s (-14.54 s) -
2026-07-25 15:00:00 UTC (Delta: 2026-07-18)
WHERE IS HAYABUSA2♯?
- Barycentric speed: 33.06 km/s (-0.71 km/s)
- Earth flyby: December 2027🪨 Relative to 1998 KY26
- Distance (km): 343,167,370.08 km (+6,260,364.05 km)
- Distance (AU): 2.29 (+0.04)
- Light travel time: 19 min 4.72 s (+20.88 s)🌎 Relative to Earth
- Distance (km): 77,913,747.28 km (-5,179,992.74 km)
- Distance (AU): 0.52 (-0.03)
- Light travel time: 4 min 19.90 s (-17.28 s) -
2026-07-18 15:00:00 UTC (Delta: 2026-07-11)
WHERE IS HAYABUSA2♯?
- Barycentric speed: 33.76 km/s (-0.68 km/s)
- Earth flyby: December 2027🪨 Relative to 1998 KY26
- Distance (km): 336,907,006.03 km (+7,216,921.62 km)
- Distance (AU): 2.25 (+0.05)
- Light travel time: 18 min 43.84 s (+24.07 s)🌎 Relative to Earth
- Distance (km): 83,093,740.02 km (-5,935,658.66 km)
- Distance (AU): 0.56 (-0.04)
- Light travel time: 4 min 37.18 s (-19.80 s) -
#ESO:
"
Könnte Hayabusa2 auf 1998 KY26 aufsetzen?
"
"Neue Studie zeigt, dass der Zielasteroid der Weltraummission kleiner und schneller ist als gedacht"https://www.eso.org/public/germany/news/eso2515/
18.9.2025
#Astronomie #Asteroid #1998KY26 #Hayabusa2 #Japan #JAXA #Raumfahrt #Raumsonde #SpaceFlight #VLT
-
I have a 3D print of the old #TeamRadar #1998KY26 shape model, which was always suspiciously symmetric - because it turned out to be aliased.
Maybe I should order a new one.
QT Agata Rożek @agastro.bsky.social
2025 September 18Check out our tiny rock featured by @esoastronomy !
Now available in Nature Comms: https://www.nature.com/articles/s41467-025-63697-4
We measured the size using the new lightcurve shape models and old radar data #TeamRadar
https://bsky.app/profile/agastro.bsky.social/post/3lz44rubvus26
-
the paper
Santana-Ros et al: "#Hayabusa2 extended mission target asteroid #1998KY26 is smaller and rotating faster than
previously known."https://www.eso.org/public/archives/releases/sciencepapers/eso2515/eso2515a.pdf
-
RE: https://mastodon.social/@esoastronomy/115224504925649507
TIL a touchdown was in the "menu". Rotating at that speed and still holding up, shouldn't it be rather compact?
-
Additional background information on dark comets:
#TeamRadar observed the dark comet #1998KY26 in 1998: https://echo.jpl.nasa.gov/asteroids/ostro+1999_ky26_science.pdf . It is a lumpy ball ~30 m across.
The #Hayabusa2 spacecraft is now on its way there, with arrival in 2031 July.
-
Discussed at #ACM2023 today.
QT Michael Busch 2022 Dec 19 @michael_w_busch
Today on the arXiv:
Seligman et al. 2023, "Dark Comets? Unexpectedly Large Nongravitational Accelerations on a Sample of Small Asteroids" - arxiv.org/pdf/2212.08115…
Suggests outgassing from asteroid #1998KY26, to be visited by Hayabusa 2, at a level #TeamRadar could not detect.
-
Addendum:
Seligman et al. 2023 discuss at length other things that can push small asteroids around: thermal fracturing throwing dust out, asymmetric meteoroid bombardment, etc.
Resolving this will probably have to wait for @[email protected]/@haya2e_jaxa
to get to #1998KY26. -
Addendum:
Seligman et al. 2023 discuss at length other things that can push small asteroids around: thermal fracturing throwing dust out, asymmetric meteoroid bombardment, etc.
Resolving this will probably have to wait for @[email protected] / @[email protected] to get to #1998KY26.
-
@astrokiwi For the NEAs in this sample; there are options on thermal fracturing, asymmetric meteoroid bombardment, etc. that would push the rock piles around a little bit without outgassing - Seligman et al. rightly discussed the possibilities at length (comparing to Bennu).
Some may not work - e.g. #1998KY26 spins fast, so thermal swings are low.
But that seems qualitatively different than #ʻOumuamua?
-
How could a ~30 m near-Earth asteroid like #1998KY26 hold on to volatiles long enough to still be outgassing?
Hmm...
-
Today on the arXiv:
Seligman et al. 2023, "Dark Comets? Unexpectedly Large Nongravitational Accelerations on a Sample of Small Asteroids" - https://arxiv.org/pdf/2212.08115.pdf
Suggests outgassing from asteroid #1998KY26, to be visited by Hayabusa 2, at a level #TeamRadar could not detect.