NGC 2903 is a barred spiral galaxy in
the constellation Leo. NGC 2903 is
100 kly across and 30 Mly away.
Hover over the picture for an annotated version
Date: 14 February 2026
FOV: cropped to 30' × 20'; the apparent size
of NGC 2903 is about 11.5′ × 5.3′
Rotation: 89.727°
Telescope: Orion 127mm Mak-Cass (1382mm, nominally 1540mm, f/12.1)
Guiding: ZWO ASI120MM mini mono guide camera,
Stellarvue FO50G-IW f/4 guide scope
Computer: ASIair pro Raspberry Pi
Mount: ZWO AM5
Camera: ZWO ASI071MC Pro Cooled (-10°C) Color CMOS with gain 90
Pixel size: 4.78 μm
Resolution: 0.714 arcsec/pixel
Stacking: sixty-eight 300 second frames using Pixinsight
Calibration: 20 flats, 20 dark flats, and 20 darks
Total Time: 5 hours 40 minutes
Processing: Pixinsight – SPPC, DBE, SPCC, BlurXT, NoiseXT, DynCrop → Linear
MStr, GHS, HST, PMath MStr + GHS + HST → Stars, Sat,
StarXT, MStr, GHS, HST, PMath MStr + GHS + HST → Starless,
CurvesTr, HDRMST4PhLm, PMath ~(~Stars*~Starless) → Blend, scale
Location: Kopernik Observatory near Vestal, NY
