David's Astronomy - Images 2026-04-18 (S1423)

David's Astronomy Pages
Images - Session 1423 (2026-04-18)

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Objects Session Notes

24P/Schaumasse - Comet

29P/Schwassmann-Wachmann - Comet

C/2022 N2 (PANSTARRS) - Comet

C/2025 K1 (ATLAS) - Comet  (non-detection)

AT 2026eva - Type CV? Transient

AT 2026hix - Type CV? Transient  (non-detection)

AT 2026hzf - Unconfirmed Transient  (non-detection)

AT 2026jcv - CV Type Transient

AT 2026juw - CV Type Transient

AT 2026jyw - Transient

M31N 2026-04a? - Extragalactic Nova in M31  (non-detection)

NGC 4914 - Elliptical Galaxy with Type Ia Supernova 2026fjc

PCG 1221+5548 - Compact Galaxy Group

PCG 1516+0257 - Compact Galaxy Group

UGCA 338 - Spiral Galaxy (PGC 45958)

UGC 5607 - Spiral Galaxy with Type Ia Supernova 2026kc

Variable Stars (photometric monitoring)

- T CrB, AM Her, BL Lac

Nearby Stars (astrometric monitoring)

- CN Leo (Wolf 359)

- All-Night Session (6.2 hr)

- 12" LX200 + ST-10XME for imaging

- TS 80mm APO + ZWO ASI178MC for guiding & imaging

- Ambient Temperature: 2.5°C (min)

- CCD Temperature:  -20°C

- Notes from 2026-04-18 >>

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24P/Schaumasse - Comet

24P/Schaumasse - 2026-04-18 (passing through Virgo) Sun Distance 1.73 AU Earth Distance 0.76 AU (113.7 million km)		24P/Schaumasse - 2026-04-18 Detail Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra -51.2 arcsec/hr, Dec -17.0 arcsec/hr)

Annotated CCD Image (50% size, square root scale) 2 x 60s exposure (average combine), 3x3 binning, Clear Filter 2026-04-18 23:22 UT (#1423075-76) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2		Annotated CCD Image (125% size, square root scale, cropped) 8 x 60s exposure (average combine), 3x3 binning, Clear Filter 2026-04-18 23:26 UT (#1423075-82) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of Comet_24P_Schaumasse on Comets 2026 Page >>

29P/Schwassmann-Wachmann - Comet

29P/Schwassmann-Wachmann - 2026-04-18 (passing through Leo) Sun Distance 6.31 AU Earth Distance 5.53 AU (827.2 million km)		29P/Schwassmann-Wachmann - 2026-04-18 Detail Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra -9.0 arcsec/hr, Dec 4.5 arcsec/hr) Measured M2 Magnitude +13.73 (Clear Filter)

Annotated CCD Image (50% size, log scale) 7 x 90s exposure (average combine), 3x3 binning, Clear Filter 2026-04-18 22:46 UT (#1423057-63) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2		Annotated CCD Image (125% size, log scale, cropped) Image details as left

Images of Comet_29P_Schwassmann-Wachmann on Comets 2026 Page >>

C/2022 N2 (PANSTARRS) - Comet

C/2022 N2 (PANSTARRS) - 2026-04-18 (passing through Taurus) Sun Distance 4.45 AU Earth Distance 5.14 AU (769.1 million km) Target not centered		C/2022 N2 (PANSTARRS) - 2026-04-18 Detail Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra 39.6 arcsec/hr, Dec 4.0 arcsec/hr)

Annotated CCD Image (50% size, square root scale) 7 x 60s exposure (average combine), 3x3 binning, Clear Filter 2026-04-18 21:33 UT (#1423015-21) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2		Annotated CCD Image (125% size, square root scale, cropped) 7 x 60s exposure (average combine), 3x3 binning, Clear Filter 2026-04-18 21:33 UT (#1423015-21) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of C2022_N2_PANSTARRS on Comets 2026 Page >>

C/2025 K1 (ATLAS) - Comet (non-detection)

C/2025 K1 (ATLAS) - 2026-04-19 (passing through Cepheus) Sun Distance 4.75 AU Earth Distance 5.17 AU (774.1 million km) Expected position of comet (not visible) is shown by white circle		C/2025 K1 (ATLAS) - 2026-04-19 Detail Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra 9.4 arcsec/hr, Dec 17.1 arcsec/hr)

Annotated CCD Image (50% size, square root scale) 4 x 30s exposure (average combine), 3x3 binning, Clear Filter 2026-04-19 01:19 UT (#1423120-24) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2		Annotated CCD Image (125% size, square root scale, cropped) 19 x 30s exposure (average combine), 3x3 binning, Clear Filter 2026-04-19 01:26 UT (#1423120-39) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of C2025_K1_ATLAS on Comets 2026 Page >>

AT 2026eva - Type CV? Transient

AT 2026eva (Orion)
AT 2026eva (Type: CV?) discovered 2026-03-03.154 UT by GEOTS
Alias: GEOTS-Balaji-2026-002
Discovery Magnitude 16.6 (Clear- Filter)
vs Prior Non-Detection Limiting Magnitude 18 (Clear- Filter)
Discovered in Ori using 14" f/2.0 Astrograph at Golden Ears Observatory (MPC code U55). Group reports a variable star candidate not currently archived in the VSX database. Analysis of ASAS-SN (All-Sky Automated Survey for SuperNovae) light curves reveals a brightness fluctuation exceeding 1.0 magnitude, suggesting a potential long-period variable or high-amplitude eclipsing system.
( TNS 2026eva )

AT 2026eva - 2026-04-18 (T+46.7d)
Image below (2026-04-18.884) was taken 46.7 days after discovery of 2026eva
Position of earlier transient (faint) is shown by white cross-hairs
Measured Magnitude +16.39 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped)
2 x 180s exposure (average combine), 3x3 binning, Clear Filter
2026-04-18 21:18 UT (#1423008-10)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2026eva on Transients 2026 Page >>

AT 2026hix - Type CV? Transient (non-detection)

AT 2026hix (Canis Minor)
AT 2026hix (Type: CV?) discovered 2026-03-25.730 UT by XOSS
Alias: KATS26F003
Discovery Magnitude 16.23 (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/kats26f003.html
( TNS 2026hix )

AT 2026hix - 2026-04-18 (T+24.2d)
Image below (2026-04-18.906) was taken 24.2 days after discovery of 2026hix
Position of earlier transient (not visible) is shown by white cross-hairs
Non-Detection Limiting Magnitude +18.7 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, Clear Filter
2026-04-18 21:54 UT (#1423025-29)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2026hix on Transients 2026 Page >>

AT 2026hzf - Unconfirmed Transient (non-detection)

AT 2026hzf (Libra)
AT 2026hzf (Type: unconf) discovered 2026-03-31.398 UT by Firstlight Bot
Alias: FL_ZTF26aaqvnas_3376397562915015009
Discovery Magnitude 15.516 (g-ZTF Filter)
vs Prior Non-Detection Limiting Magnitude 18.959 (g-ZTF Filter)
firstlight auto (objId=ZTF26aaqvnas candid=3376397562915015009 fid=1)
( TNS 2026hzf )

AT 2026hzf - 2026-04-19 (T+18.6d)
Image below (2026-04-19.014) was taken 18.6 days after discovery of 2026hzf
Position of earlier transient (not visible) is shown by white cross-hairs
Non-Detection Limiting Magnitude +19.6 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped)
4 x 180s exposure (average combine), 3x3 binning, Clear Filter
2026-04-19 00:28 UT (#1423099-103)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2026hzf on Transients 2026 Page >>

AT 2026jcv - CV Type Transient

AT 2026jcv (Ophiuchus)
AT 2026jcv (Type: CV) discovered 2026-04-09.864 UT by XOSS
Alias: KATS26G002
Discovery Magnitude 16.87 (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/kats26g002.html
( TNS 2026jcv )

AT 2026jcv - 2026-04-19 (T+9.2d)
Image below (2026-04-19.113) was taken 9.2 days after discovery of 2026jcv
Position of earlier transient (very faint) is shown by white cross-hairs
Measured Magnitude +18.12 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped)
4 x 60s exposure (average combine), 3x3 binning, Clear Filter
2026-04-19 02:45 UT (#1423169-73)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2026jcv on Transients 2026 Page >>

AT 2026juw - CV Type Transient

AT 2026juw (Cygnus)
AT 2026juw (Type: CV) discovered 2026-04-16.318 UT by GEOTS
Alias: GEOTS-Balaji-2026-005, IRAS 19523+4538
Discovery Magnitude 13.8 (Clear- Filter)
vs Prior Non-Detection Limiting Magnitude 18 (Clear- Filter)
Discovered in Cyg using 14" f/2.0 Astrograph at Golden Ears Observatory (MPC code U55). Group reports the discovery of a variable star displaying significant variability, characterized by periods of quiescence interspersed with episodic flaring activity. The object has increased in brightness by approximately 1.8 magnitudes compared to its last recorded observation on March 30, 2025. Period analysis of ZTF light curves performed with Peranso suggests a periodicity of roughly 323 days.
( TNS 2026juw )

AT 2026juw - 2026-04-19 (T+2.7d)
Image below (2026-04-19.045) was taken 2.7 days after discovery of 2026juw
Position of earlier transient (distinct) is shown by white cross-hairs
Measured Magnitude +12.44 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped)
5 x 60s exposure (average combine), 3x3 binning, Clear Filter
2026-04-19 01:08 UT (#1423113-17)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2026juw on Transients 2026 Page >>

AT 2026jyw - Transient

AT 2026jyw (Ophiuchus)
AT 2026jyw (Type: unk) discovered 2026-04-17.498 UT by MASTER
Alias: MASTER OT J170428.77-215420.0
Discovery Magnitude 15.9 (Other- Filter)
vs Prior Non-Detection Limiting Magnitude 19.1 (Other- Filter)
MASTER-OAGH
( TNS 2026jyw )

AT 2026jyw - 2026-04-19 (T+1.6d)
Image below (2026-04-19.096) was taken 1.6 days after discovery of 2026jyw
Position of earlier transient (faint) is shown by white cross-hairs
Measured Magnitude +15.71 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, Clear Filter
2026-04-19 02:27 UT (#1423162-66)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2026jyw on Transients 2026 Page >>

M31N 2026-04a? - Extragalactic Nova in M31 (non-detection)

M31 with M31N 2026-04a? (Andromeda)
M31N 2026-04a? (Type: EGN?) discovered 2026-04-08.079 UT by Kamil Hornoch et al.
Alias: PNV J00433836+4115324
[ Messier Objects ]

M31 w/M31N 2026-04a? - Cam2 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

Annotated CMOS Image (16% size)
10s exposure, 1x1 binning
2026-04-19 0`:36 UT
TS 80mm APO + ZWO ASI178MC

M31 with M31N 2026-04a? - 2026-04-19 (T+11.0d)
Image below (2026-04-19.068) was taken 11.0 days after discovery of M31N 2026-04a?

Annotated CCD Image (70% size, square root scale)
5 x 180s exposure (average combine), 3x3 binning, Clear Filter
2026-04-19 01:47 UT (#1423142-46)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

M31 with M31N 2026-04a? - 2026-04-19 (T+11.0d)
Image below (2026-04-19.068) was taken 11.0 days after discovery of M31N 2026-04a?
Position of earlier transient (not visible) is shown by white cross-hairs
Non-Detection Limiting Magnitude +18.4 (Clear Filter)

Annotated CCD Image (125% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, Clear Filter
2026-04-19 01:47 UT (#1423142-46)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of M31N 2026-04a? (in M31) on Transients 2026 Page >>

NGC 4914 - Elliptical Galaxy with Type Ia Supernova 2026fjc

NGC 4914 with SN 2026fjc (Canes Venatici)
SN 2026fjc (Type: Ia) discovered 2026-03-12.080 UT by ATLAS
Alias: ATLAS26cwi, ZTF26aakqkpn, GOTO26ceh, WFST260310bkxqt
Discovery Magnitude 18.475 (wide-ATLAS Filter)
vs Prior Non-Detection Limiting Magnitude 19.35 (orange-ATLAS Filter)
( TNS 2026fjc )

NGC 4914 with SN 2026fjc - 2026-04-18 (T+37.9d)
Image below (2026-04-18.984) was taken 37.9 days after discovery of 2026fjc
Position of earlier supernova (faint) is shown by white cross-hairs
Estimated Magnitude +15.4 (Clear Filter)

Annotated CCD Image (125% size, log scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, Clear Filter
2026-04-18 23:46 UT (#1423085-89)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2026fjc (in NGC 4914) on Supernovae 2026 Page >>

PCG 1221+5548 - Compact Galaxy Group

PCG 1221+5548 (Ursa Major)
Palomar Compact Galaxy Catalogue, radius 37 arcsec, mag 15.4
[ PCG Groups ]

PCG 1221+5548 - Compact Galaxy Group

Annotated CCD Image (50% size, square root scale)
5 x 180s exposure (average combine), 3x3 binning, Clear Filter
2026-04-19 00:08 UT (#1423092-96)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

PCG 1221+5548 - Detail

Annotated CCD Image (150% size, square root scale, cropped)
Image details as above

3 components
- A (PGC 2514866, catalog mag +17.0)
- B (PGC 2515140, catalog mag +18.0)
- C (SDSS J122142.42+554832.7)

Annotated CCD Image (150% size, square root scale, cropped)
Image details as above

PCG 1221+5548 (Ursa Major)

Annotated negative CCD Image (150% size, square root scale, cropped)
Image details as above

PCG 1516+0257 - Compact Galaxy Group

PCG 1516+0257 (Serpens)
Palomar Compact Galaxy Catalogue, radius 15 arcsec, mag 15.2
[ PCG Groups ]

PCG 1516+0257 - Compact Galaxy Group

Annotated CCD Image (50% size, square root scale)
5 x 180s exposure (average combine), 3x3 binning, Clear Filter
2026-04-19 00:49 UT (#1423106-10)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

PCG 1516+0257 - Detail

Annotated CCD Image (175% size, square root scale, cropped)
Image details as above

Annotated CCD Image (175% size, square root scale, cropped)
Image details as above

Annotated negative CCD Image (175% size, square root scale, cropped)
Image details as above

UGCA 338 - Spiral Galaxy (PGC 45958)

UGCA 338 (Virgo)
Alias: PGC 45958 (catalog mag +13.9)
[ UGCA Galaxies ]

UGCA 338 - Spiral Galaxy

Annotated CCD Image (50% size, square root scale)
4 x 180s exposure (average combine), 3x3 binning, Clear Filter
2026-04-18 23:09 UT (#1423068-71)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGCA 338 (Virgo)

Annotated CCD Image (125% size, square root scale, cropped)
Image details as above

UGCA 338 (Virgo)

Annotated negative CCD Image (125% size, square root scale, cropped)
Image details as above

UGC 5607 - Spiral Galaxy with Type Ia Supernova 2026kc

UGC 5607 with SN 2026kc (Sextans)
SN 2026kc (Type: Ia) discovered 2026-01-10.087 UT by ATLAS
Alias: ATLAS26aej, GOTO26dc, ZTF26aaaehuj
Discovery Magnitude 18.78 (L-GOTO Filter)
vs Prior Non-Detection Limiting Magnitude 19.5 (L-GOTO Filter)
( TNS 2026kc )

UGC 5607 with SN 2026kc - 2026-04-18 (T+98.8d)
Image below (2026-04-18.921) was taken 98.8 days after discovery of 2026kc
Position of earlier supernova (very faint) is shown by white cross-hairs
Measured Magnitude +17.8 (Clear Filter)

Annotated CCD Image (150% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, Clear Filter
2026-04-18 22:15 UT (#1423033-37)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2026kc (in UGC 5607) on Supernovae 2026 Page >>