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Astronomical Transients - 2026
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2025
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2026
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Transients 2026 |
This page documents observations and images of Astronomical Transients (AT) with discovery dates in 2026.
(Note: Some images may roll over into the following 1-3 years)
(Note: Supernovae in 2026 are presented on a separate page : SN 2026 )
| Galactic Transients | M31 Transients | M33 Transients | Other Extragalactic Transients |
Galactic Transients (2026)
Name, type, discovery date
Extragalactic Transients (2026)
Name, type, discovery date, host galaxy (if relevant)
M31 Transients AT 2026gs - Transient (2026-01-08) in M31 (non-detection) M33 Transients Other Extragalactic Transients AT 2026X - Transient (2026-01-04) in M99 AT 2026cex - Transient (2026-01-30) in NGC 2398
| AT 2026ciw (Canes Venatici) Discovery Magnitude 15.2 (Other- Filter) vs Prior Non-Detection Limiting Magnitude 18.7 (Other- Filter) OT,no outbursts in MASTER history, nothing in VIZIER = ampl>7.8mag *PanSTARRs 24m limit in history) ( TNS 2026ciw ) |
| AT 2026ciw - 2026-02-27 (T+18.8d) Image below (2026-02-27.069) was taken 18.8 days after discovery of 2026ciw Position of earlier transient (not visible) is shown by white cross-hairs Non-Detection Limiting Magnitude +19.1 (Clear Filter) with adjacentfaint galaxies, PGC 48239, (catalog mag +16.9), PGC 2039645 (catalog mag +16.4), PGC 2039324 (catalog mag +17.2) |
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| Annotated CCD Image (100% size, linear scale, cropped) 2 x 180s exposure (average combine), 3x3 binning, Clear Filter 2026-02-27 01:43 UT (#1395217-18) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2 |
| AT 2026ciw - 2026-02-27 (T+19.7d) Image below (2026-02-27.947) was taken 19.7 days after discovery of 2026ciw Position of earlier transient (not visible) is shown by white cross-hairs Non-Detection Limiting Magnitude +19.0 (Clear Filter) |
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| Annotated CCD Image (100% size, linear scale, cropped) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2026-02-27 22:51 UT (#1396067-70) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2 |
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| AT 2026ceu (Lyra) AT 2026ceu (Type: CV?) discovered 2026-02-05.481 UT by GEOTS Alias: GEOTS-Balaji-2026-001 Discovery Magnitude 15.2 (Clear- Filter) vs Prior Non-Detection Limiting Magnitude 18 (Clear- Filter) Discovered in Lyr using 14" f/2.0 Astrograph at Golden Ears Observatory (MPC code U55). CV candidate with a 1.0 mag increase compared to the PS1 reference magnitude ( TNS 2026ceu ) |
| AT 2026ceu - 2026-02-28 (T+22.7d) Image below (2026-02-28.158) was taken 22.7 days after discovery of 2026ceu Position of earlier transient (very faint) is shown by white cross-hairs Measured Magnitude +14.7 (Clear Filter) - very uncetain photometry. Bright glare from Vega (mag 0.0) |
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| Annotated CCD Image (100% size, linear scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2026-02-28 03:57 UT (#1396213-17) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2 |
| AT 2026ceu - 2026-03-04 (T+26.6d) Image below (2026-03-04.089) was taken 26.6 days after discovery of 2026ceu Position of earlier transient (very faint) is shown by white cross-hairs Limiting Magnitude +15.8 (Clear Filter) |
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| Annotated CCD Image (100% size, linear scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2026-03-04 02:17 UT (#1399221-25) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2 |
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| AT 2026coj (Monoceros) AT 2026coj (Type: CV?) discovered 2026-02-08.809 UT by XOSS Alias: KATS26C004, TCP J08011102-0343141 Discovery Magnitude 15.1 (Clear- Filter) vs Prior Non-Detection Limiting Magnitude ( Filter) Cataclysmic variable candidate classified by XOSS. Details can be found at http://xjltp.china-vo.org/kats26c004.html ( TNS 2026coj ) |
| AT 2026coj - 2026-02-13 (T+5.1d) Image below (2026-02-13.910) was taken 5.1 days after discovery of 2026coj Position of earlier transient (fain but distinctt) is shown by white cross-hairs Measured Magnitude +14.55 (Clear Filter) |
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| Annotated CCD Image (100% size, linear scale, cropped) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2026-02-13 21:59 UT (#1393068-72) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2 |
| AT 2026coj - 2026-02-17 (T+9.2d) Image below (2026-02-17.992) was taken 9.2 days after discovery of 2026coj Position of earlier transient (faint, fading) is shown by white cross-hairs Measured Magnitude +15.13 (Clear Filter) |
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| Annotated CCD Image (100% size, linear scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2026-02-17 23:57 UT (#1394104-08) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2 |
| AT 2026coj - 2026-03-03 (T+23.1d) Image below (2026-03-03.927) was taken 23.1 days after discovery of 2026coj Position of earlier transient (faint) is shown by white cross-hairs Measured Magnitude +16.31 (Clear Filter) |
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| Annotated CCD Image (100% size, linear scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2026-03-03 22:23 UT (#1399117-21) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2 |
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| AT 2026cpv (Cygnus) AT 2026cpv (Type: HPM) discovered 2026-02-09.508 UT by MASTER Alias: MASTER OT J192256.61+460501.0 Discovery Magnitude 15.8 (Other- Filter) vs Prior Non-Detection Limiting Magnitude 19.7 (Other- Filter) star with proper motion and with 0.3mag variability per 1 hour ( TNS 2026cpv ) |
| AT 2026cpv - 2026-02-28 (T+18.5d) Image below (2026-02-28.042) was taken 18.5 days after discovery of 2026cpv Position of earlier transient (faint) is shown by white cross-hairs Measured Magnitude +15.65 (Clear Filter) |
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| Annotated CCD Image (100% size, linear scale, cropped) 2 x 180s exposure (average combine), 3x3 binning, Clear Filter 2026-02-28 01:05 UT (#1396107-09) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2 |
| AT 2026cpv - 2026-03-03 (T+21.6d) Image below (2026-03-03.111) was taken 21.6 days after discovery of 2026cpv Position of earlier transient (faint but distinct, stable) is shown by white cross-hairs Measured Magnitude +15.65 (Clear Filter) |
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| Annotated CCD Image (100% size, linear scale, cropped) 14 x 90s exposure (average combine), 3x3 binning, Clear Filter 2026-03-03 02:52 UT (#1398189-202) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2 |
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| AT 2026cqc (Cygnus) AT 2026cqc (Type: CV) discovered 2026-02-09.526 UT by MASTER Alias: MASTER OT J191527.78+542418.1 Discovery Magnitude 16.4 (Other- Filter) vs Prior Non-Detection Limiting Magnitude 17.8 (Other- Filter) variable star, no OT at 2023-07-03 06:33:19 with mlim=17.8 ( TNS 2026cqc ) |
| AT 2026cqc - 2026-02-28 (T+18.5d) Image below (2026-02-28.055) was taken 18.5 days after discovery of 2026cqc Position of earlier transient (faint) is shown by white cross-hairs Estimated Magnitude +16.4 (Clear Filter) |
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| Annotated CCD Image (100% size, linear scale, cropped) 4 x 60s exposure (average combine), 3x3 binning, Clear Filter 2026-02-28 01:22 UT (#1396112-16) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2 |
| AT 2026cqc - 2026-03-04 (T+22.5d) Image below (2026-03-04.075) was taken 22.5 days after discovery of 2026cqc Position of earlier transient (very faint) is shown by white cross-hairs Measured Magnitude +16.6 (Clear Filter) |
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| Annotated CCD Image (100% size, linear scale, cropped) 5 x 60s exposure (average combine), 3x3 binning, Clear Filter 2026-03-04 01:51 UT (#1399206-10) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2 |
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| AT 2026dfh (Canis Minor) AT 2026dfh (Type: CV?) discovered 2026-02-11.762 UT by XOSS Alias: KATS26C007 Discovery Magnitude 16.63 (Clear- Filter) vs Prior Non-Detection Limiting Magnitude ( Filter) Cataclysmic variable candidate classified by XOSS. Details can be found at http://xjltp.china-vo.org/kats26c007.html ( TNS 2026dfh ) |
| AT 2026dfh - 2026-03-02 (T+19.2d) Image below (2026-03-02.917) was taken 19.2 days after discovery of 2026dfh Position of earlier transient (not visible) is shown by white cross-hairs Non-Detection Limiting Magnitude +16.7 (Clear Filter) Poor quality image (bright moonlit sky background, single frame) |
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| Annotated CCD Image (100% size, linear scale, cropped) 180s exposure (single frame), 3x3 binning, Clear Filter 2026-03-02 22:01 UT (#1398043) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2 |
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| M31 with AT 2026gs (Andromeda) AT 2026gs (Type: unk) discovered 2026-01-08.786 UT by Jingyuan Zhao Alias: PNV J00425201+4114292 Discovery Magnitude 18.37 (Clear- Filter) vs Prior Non-Detection Limiting Magnitude ( Filter) Jianlin Xu, Jingyuan Zhao, Mi Zhang report discovery of a possible nova in M31. Image obtained by 0.43-m f/6.8 Corrected Dall-Kirkham robotic telescope at Alnitak Remote Observatories in Nerpio, Spain, exposured 200s with Clear filter, around 2026 Jan. 08.78633 UT, mag = 18.37 CV. Observations were made using Alnitak Remote Observatories robotic telescope network, Alnitak Research Telescope Access (ARTA) program. ( TNS 2026gs ) |
| M31 with AT 2026gs - Reference Image Position of AT 2026gs (not visible in this exposure) is shown by blue circle Limits of M31 Spiral Galaxy is shown by pale cyan ellipse |
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| Annotated CMOS Image (16% size) 10s exposure, 1x1 binning 2026-03-02 20:26 UT TS 80mm APO, ZWO ASI178MC |
| M31 with AT 2026gs - 2026-03-02 (T+53.1d) Image below (2026-03-02.852) was taken 53.1 days after discovery of 2026gs |
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| Annotated CCD Image (70% size, square root scale) 2 x 180s exposure (average combine), 3x3 binning, Clear Filter 2026-03-02 20:32 UT (#1398031-33) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2 |
| M31 with AT 2026gs - 2026-03-02 (T+53.1d) Image below (2026-03-02.852) was taken 53.1 days after discovery of 2026gs Position of earlier transient (not visible) is shown by white cross-hairs Non-Detection Limiting Magnitude +16.5 (Clear Filter) |
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| Annotated CCD Image (125% size, square root scale, cropped) 2 x 180s exposure (average combine), 3x3 binning, Clear Filter 2026-03-02 20:32 UT (#1398031-33) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2 |
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| M99 with AT 2026X (Coma Berenices) AT 2026X (Type: unk) discovered 2026-01-04.664 UT by Yuan-Sheng Tsai Discovery Magnitude 17.8 (L- Filter) CDK17+Poseidon M ( TNS 2026X ) |
| M99 - Spiral Galaxy |
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| Annotated CCD Image (50% size, square root scale) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2026-01-13 23:57 UT (#1390170-74) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2 |
| M99 - Detail |
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| Annotated CCD Image (100% size, square root scale, cropped) Image details as above |
| M99 with AT 2026X - 2026-01-13 (T+9.3d) Image below (2026-01-13.992) was taken 9.3 days after discovery of 2026X Position of earlier transient (not separately distinguishable) is shown by white cross-hairs |
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| Annotated CCD Image (100% size, square root scale, cropped) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2026-01-13 23:57 UT (#1390170-74) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2 |
| M99 - Earlier Image (2025-03-29) |
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| Annotated CCD Image (100% size, square root scale, cropped) 2 x 180s exposure (average combine), 3x3 binning, Clear Filter 2025-03-29 00:13 UT (#1306065-66) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2 |
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| NGC 2398 w/AT 2026cex (Gemini) AT 2026cex discovered 2026-01-30.405 UT by Masaki Tsuboi Discovery Magnitude 15.8 (Clear- Filter) vs Prior Non-Detection Limiting Magnitude 17.8 (Clear- Filter) Offsets:104.7" W and 50.5" N of NGC 2398 ( TNS 2026cex ) |
| NGC 2398 - Spiral Galaxy |
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| Annotated CCD Image (50% size, square root scale) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2026-02-13 21:39 UT (#1393062-65) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2 |
| AT2026cex - 2026-02-13 (T+14.5d) Image below (2026-02-13.897) was taken 14.5 days after discovery of 2026cex Position of earlier transient (faint) is shown by white cross-hairs Measured Magnitude +17.38 (Clear Filter) Transient object is not seen in DSS2 image in Aladin It looks too far away from NGC 2398 to be associated with it. |
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| Annotated CCD Image (150% size, square root scale, cropped) 4 x 180s exposure (average combine), 3x3 binning, Clear Filter 2026-02-13 21:39 UT (#1393062-65) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2 |
| AT2026cex - 2026-02-17 (T+18.5d) Image below (2026-02-17.917) was taken 18.5 days after discovery of 2026cex Position of earlier transient (faint) is shown by white cross-hairs Measured Magnitude +17.44 (Clear Filter) |
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| Annotated CCD Image (150% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2026-02-17 22:09 UT (#1394060-64) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2 |
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| This Web Page: | Astronomical Transients - 2026 |
| Last Updated : | 2026-03-05 |
| Site Owner : | David Richards |
| Home Page : | David's Astronomy Web Site |
