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Images of Celestial Objects

M87 Galaxy — M87 Galaxy

May 14, 2025 21:56(JST)

Instrument : TriCCS

Exposure : g, r, i-bands each 600seconds

Field of view : 13.0x7.9arcmin

© Okayama Astronomical Observatory, Kyoto University / University of Tokyo

High Res. (2220x1352pix, 1.5MB)

C/2025 K1 ATLAS — C/2025 K1 ATLAS breakup

November 19, 2025, 29:19(JST)

Instrument : TriCCS

Exposure : g, r, i-bands each 100seconds

Field of view : 12.3x7.2arcmin

© Okayama Astronomical Observatory, Kyoto University / University of Tokyo

M57 Ring Nebula — M57 Planetary Nebula (Ring Nebula)

August 30, 2025, 21:37(JST)

Instrument : TriCCS

Exposure : g, r, i-bands each 300seconds

Field of view : 13.0x7.9arcmin

© Okayama Astronomical Observatory, Kyoto University / University of Tokyo

High Res. (2224x1347pix, 722KB)

NGC 6015 Galaxy — NGC 6015 Galaxy

August 30, 2025, 22:03(JST)

Instrument : TriCCS

Exposure : g, r, i-bands each 600seconds

Field of view : 12.8x7.8arcmin

© Okayama Astronomical Observatory, Kyoto University / University of Tokyo

High Res. (2178x1344pix, 820KB)

CRL 2688 Protoplanetary Nebula — CRL 2688 Protoplanetary Nebula

August 30, 2025, 23:40(JST)

Instrument : TriCCS

Exposure : g, r, i-bands each 300seconds

Field of view : 13.0x7.9arcmin

© Okayama Astronomical Observatory, Kyoto University / University of Tokyo

High Res. (2224x1347pix, 723KB)

Cassiopeia A Supernova Remnant — Cassiopeia A Supernova Remnant

August 30, 2025, 23:59(JST)

Instrument : TriCCS

Exposure : g, r, i-bands each 600seconds

Field of view : 12.8x7.8arcmin

© Okayama Astronomical Observatory, Kyoto University / University of Tokyo

High Res. (2195x1330pix, 761KB)

NGC 7331 Galaxy — NGC 7331 Galaxy

August 30, 2025, 22:45(JST)

Instrument : TriCCS

Exposure : g, r, i-bands each 300seconds

Field of view : 12.9x20.7arcmin

© Okayama Astronomical Observatory, Kyoto University / University of Tokyo

High Res. (2218x3552pix, 1.58MB)

FU Orionis — FU Orionis

Decmber 29, 2025, 21:39(JST)

Instrument : TriCCS

Exposure : g, r, i-bands each 600seconds

Field of view : 24.2x14.3arcmin

© Okayama Astronomical Observatory, Kyoto University / University of Tokyo

High Res. (4145x2452pix, 2.3MB)

NGC 1068 Galaxy — NGC 1068 Galaxy

January 13, 2025, 20:01(JST)

Instrument : TriCCS

Exposure : g, r, i-bands each 520seconds

Field of view : 20.0x13.5arcmin

© Okayama Astronomical Observatory, Kyoto University / University of Tokyo

High Res. (3435x2318pix, 317KB)

Cosmic Horseshoe — SDSS J114833.14+193003.2 Gravitational lens (Cosmic Horseshoe)

May 14, 2025, 22:17(JST)

Instrument : TriCCS

Exposure : g, r, i-bands each 900seconds

Field of view : 13.6x7.9arcmin

© Okayama Astronomical Observatory, Kyoto University / University of Tokyo

High Res. (2335x1350pix, 3.3MB)

NGC 6543 Cat's Eye Nebula — NGC 6543 Protoplanetary Nebula (Cat's Eye Nebula)

June 19, 2025, 23:23(JST)

Instrument : TriCCS

Exposure : g, r, i-bands each 600seconds

Field of view : 13.0x7.9arcmin

© Okayama Astronomical Observatory, Kyoto University / University of Tokyo

High Res. (2220x1350pix, 1.2MB)

Abell 39 Protoplanetary Nebula — Abell 39 Protoplanetary Nebula

June 19, 2025, 22:30(JST)

Instrument : TriCCS

Exposure : g, r, i-bands each 600seconds

Field of view : 20.7x12.9arcmin

© Okayama Astronomical Observatory, Kyoto University / University of Tokyo

High Res. (3555x2217pix, 3.9MB)

M60 Galaxy, NGC 4647 Galaxy — M60 Galaxy, NGC 4647 Galaxy

April 29, 2025, 22:44(JST)

Instrument : TriCCS

Exposure : g, r, i-bands each 420seconds

Field of view : 23.8x14.5arcmin

© Okayama Astronomical Observatory, Kyoto University / University of Tokyo

High Res. (4078x2486pix, 6.8MB)

M46 Open Cluster, NGC 2438 Protoplanetary Nebula — M46 Open Cluster, NGC 2438 Protoplanetary Nebula

Decmber 29, 2024, 24:16(JST)

Instrument : TriCCS

Exposure : g, r, i-bands each 300seconds

Field of view : 24.5x20.8arcmin

© Okayama Astronomical Observatory, Kyoto University / University of Tokyo

High Res. (4192x3562pix, 3.3MB)

NGC 1501 Oyster Nebula — NGC 1501 Protoplanetary Nebula (Oyster Nebula)

Dcember 29, 2024, 22:50(JST)

Instrument : TriCCS

Exposure : g, r, i-bands each 600seconds

Field of view : 13.0x8.0arcmin

© Okayama Astronomical Observatory, Kyoto University / University of Tokyo

High Res. (2236x1368pix, 337KB)

NGC 6946 Galaxy — NGC 6946 Galaxy

July 21, 2024 25:48(JST)

Instrument : TriCCS

Exposure : g, r, i-bands each 540seconds

Field of view : 23.6x14.0arcmin

© Okayama Astronomical Observatory, Kyoto University / University of Tokyo

High Res. (4040x2392pix, 2.5MB)

NGC 6888 Crescent Nebula — NGC 6888 Wolf-Rayet Nebula (Crescent Nebula)

July 3, 2024, 23:09(JST)

Instrument : TriCCS

Exposure : g, r, i-bands each 300seconds

Field of view : 23.6x20.4arcmin

© Okayama Astronomical Observatory, Kyoto University / University of Tokyo

High Res. (4041x3501pix, 14.4MB)

3I/Atlas Interstellar Object

July 15, 2025, 22:05(JST)

Instrument : TriCCS

Exposure : g, r, i-bands each 60seconds x 10 frames played back at 2 frames per second (120x speed)

Field of view : 12.3x6.9arcmin

© Okayama Astronomical Observatory, Kyoto University / University of Tokyo

QSO B1422+231 Quasar — QSO B1422+231 Quasar

April 9, 2025, 22:46(JST)

Instrument : TriCCS

Exposure : g, r, i-bands each 540seconds

Field of view : 20.8x11.9arcmin

© Okayama Astronomical Observatory, Kyoto University / University of Tokyo

High Res. (3558x2043pix, 3.4MB)

Peculiar galaxies Stephan's Quintet — Peculiar galaxies 8 images

Arp 105, Arp 273, Arp 290

Arp 94, Arp 143, Arp 319

Arp 157, NGC 2146

© Okayama Astronomical Observatory, Kyoto University / University of Tokyo

High Res. (6382x3688pix, 8.3MB)

T Tauri — T Tauri

January 4, 2025, 23:19(JST)

Instrument : TriCCS

Exposure : g, r, i-bands each 540seconds

Field of view : 23.8x14.0arcmin

© Okayama Astronomical Observatory, Kyoto University / University of Tokyo

High Res. (4068x2446pix, 6.5MB)

M51 Whirlpool Galaxy — M51 Galaxy (Whirlpool Galaxy)
April 04, 2025, 26:26 (JST)
Instrument : TriCCS
Exposure : g, r, i-bands each 480seconds
Field of view : 13.2x18.9arcmin
© Okayama Astronomical Observatory, Kyoto University / University of Tokyo
High Res. (2270x3246pix, 4.0MB)

M1 Crab Nebula — M1 Supernova remnant (Crab Nebula)
December 18, 2024, 22:47 (JST)
Instrument : TriCCS
Exposure : g, r, i-bands each 540seconds
Field of view : 23.8x14.0arcmin
© Okayama Astronomical Observatory, Kyoto University / University of Tokyo
High Res. (4080x2408pix, 2.3MB)

Abell 2151 Hercules Cluster — Abell 2151 Galaxy cluster (Hercules Cluster)
July 4, 2024, 21:49(JST)
Instrument : TriCCS
Exposure : g, r, i-bands each 540seconds
Field of view : 23.1x20.2arcmin
© Okayama Astronomical Observatory, Kyoto University / University of Tokyo
High Res. (3953x3456pix, 12.2MB)

NGC 891 Galaxy — NGC 891 Galaxy
November 3, 2024, 19:58(JST)
Instrument : TriCCS
Exposure : g, r, i-bands each 360seconds
Field of view : 23.1x13.9arcmin
© Okayama Astronomical Observatory, Kyoto University / University of Tokyo
High Res.(3960x2390pix, 3.4MB)

NGC 6914 Star Forming Regions — NGC 6914 Star Forming Regions
July 5, 2024, 23:11(JST)
Instrument : TriCCS
Exposure : g, r, i-bands each 540seconds
Field of view : 23.6x26.7arcmin
© Okayama Astronomical Observatory, Kyoto University / University of Tokyo
High Res.(4056x4584pix, 6.1MB)

Sh 2-106 Star Forming Regions — Sh 2-106 Star Forming Regions
July 5, 2024, 22:15(JST)
Instrument : TriCCS
Exposure : g, r, i-bands each 540seconds
Field of view : 20.6x12.7arcmin
© Okayama Astronomical Observatory, Kyoto University / University of Tokyo
High Res.(3530x2170pix, 6.3MB)

NGC 4151 Galaxy — NGC 4151 Galaxy
May 4, 2024, 21:50(JST)
Instrument : TriCCS
Exposure : g, r, i-bands each 540seconds
Field of view : 23.4x13.8arcmin
© Okayama Astronomical Observatory, Kyoto University / University of Tokyo
High Res.(4007x2370pix, 7.8MB)

M101 Galaxy — M101 Galaxy
February 16, 2024, 25:47(JST)
Instrument : TriCCS
Exposure : g, r, i-bands each 300seconds
Field of view : 23.6x26.8arcmin
© Okayama Astronomical Observatory, Kyoto University / University of Tokyo
High Res.(4040x4600pix, 11.7MB)

Supernova SN 2023ixf in M101 — Supernova SN 2023ixf in M101
February 16, 2024, 25:47(JST)
Instrument : TriCCS
Exposure : g, r, i-bands each 300seconds
Field of view : 23.6x20.2arcmin
© Okayama Astronomical Observatory, Kyoto University / University of Tokyo
High Res.(5340x3460pix, 12.5MB)

JnEr1 Planetary Nebula — JnEr1 Planetary Nebula
April 25, 2024, 19:54(JST)
Instrument : TriCCS
Exposure : g, r, i-bands each 600seconds
Field of view : 20.5x12.5arcmin
© Okayama Astronomical Observatory, Kyoto University / University of Tokyo
High Res.(3516x2148pix, 7.0MB)

NGC 2392 Planetary Nebula — NGC 2392 Planetary Nebula
March 27, 2024, 20:19(JST)
Instrument : TriCCS
Exposure : g, r, i-bands each 300seconds
Field of view : 12.4x7.2arcmin
© Okayama Astronomical Observatory, Kyoto University / University of Tokyo
High Res.(2154x1292pix, 1.1MB)

M3 Globular Cluster — M3 Globular Cluster
March 16, 2024, 23:28 (JST)
Instrument : TriCCS
Exposure : g, r, i-bands each 300seconds
Field of View : 20.5x12.0arcmin
© Okayama Observatory, Kyoto University / University of Tokyo
High Res. (3510x2060pix, 19.5MB)

M13 Globular Cluster — M13 Globular Cluster
May 20, 2024, 23:11 (JST)
Instrument : TriCCS
Exposure : g, r, i-bands each 300seconds
Field of View : 20.5x12.0arcmin
© Okayama Observatory, Kyoto University / University of Tokyo
High Res.(3510x2060pix, 7.6MB)

M42 Orion Nebula — M42 Star Forming Regions (Orion Nebula)
February 10, 2024, 18:25:58 (JST)
Instrument : TriCCS
Exposure : g, r, i-bands each 47seconds
Field of view : 23.1x20.1arcmin
© Okayama Observatory, Kyoto University / University of Tokyo
High Res. (3930x3440pix, 10.3MB)

M68 Globular Cluster — M68 Globular Cluster
January 30, 2023, 28:13 (JST)
Instrument : TriCCS
Exposure time : g, r, i-bands each 210seconds
Field of view : 12.4x7.3arcmin
© Okayama Astronomical Observatory, Kyoto University / University of Tokyo

NGC3242 Jupiter Nebula — NGC3242 Planetary Nebula (Jupiter Nebula)
January 30, 2023, 27:09 (JST)
Instrument : TriCCS
Exposure : g, r, i-bands each 302seconds
Field of view : thumbnail 4.9x3.0arcmin / linked image 12.4x7.3arcmin
© Okayama Astronomical Observatory, Kyoto University / University of Tokyo

NGC6210 Planetary Nebula — NGC6210 Planetary Nebula
January 30, 2023, 29:22 (JST)
Instrument : TriCCS
Exposure time : g, r, i-bands each 61seconds
Field of view : thumbnail 4.9x3.0arcmin / linked image 12.4x7.2arcmin
© Okayama Astronomical Observatory, Kyoto University / University of Tokyo

Images of Telescopes and buildings

SEIMEI Telescope Homepage top image — SEIMEI Telescope (2023) Homepage top image
January 2024
High Res. (4272x2848pix, 2.8MB)

SEIMEI Telescope — SEIMEI Telescope (2023) 01
August 2023
High Res. (4272x2848pix, 6.8MB)

SEIMEI Telescope — SEIMEI Telescope (2023) 02
August 2023
High Res. (4272x2848pix, 6.9MB)

Geminids and SEIMEI Dome — Geminids and SEIMEI Dome
December 14, 2021. Composite photograph. Time-lapse video
High Res. (4928x3264pix, 8.8MB)

SEIMEI Dome at Night — SEIMEI Dome at Night
September 2021
High Res. (4000x6016pix, 13.4MB)

Okayama Astronomical Observatory — Okayama Astronomical Observatory
May 2018
High Res. (4000x6016pix, 13.4MB)

First Observation of SEIMEI Telescope — First Observation of SEIMEI Telescope
February 2019
High Res. (4272x2848pix, 7.6MB)

Primary mirror — Primary mirror 01

Primary mirror — Primary mirror 02

Primary mirror — Primary mirror 03

High Res. (4272x2848pix, 8.7MB)

SEIMEI Telescope immediately after completion — SEIMEI Telescope immediately after completion 01
July 2018
High Res. (2824x3158pix, 5.9MB)

SEIMEI Telescope immediately after completion — SEIMEI Telescope immediately after completion 02
July 2018
High Res. (3652x4000pix, 9.8MB)

SEIMEI Telescope immediately after completion — SEIMEI Telescope immediately after completion 03
July 2018
High Res. (4355x4000pix, 14.0MB)

Images of Instruments

Spectroscopic element — Spectroscopic element 01
Spectroscopic element installed in KOOLS-IFU
High Res. (4032x3024pix, 970KB)

Spectroscopic element — Spectroscopic element 02
Spectroscopic element installed in KOOLS-IFU
High Res. (4032x3024pix, 930KB)

Images of Events

Open Day 2023 — Open Day 2023 01

High Res. (4272x2848pix, 5.6MB)

Open Day 2023 — Open Day 2023 02

High Res. (4272x2848pix, 5.1MB)

Open Day 2022 — Open Day 2022 01

High Res. (6048x4024pix, 16.7MB)

Open Day 2019 — Open Day 2019 01

High Res. (4272x2848pix, 4.3MB)

Open Day 2019 — Open Day 2019 02

High Res. (4272x2848pix, 4.6MB)