Timezone: Europe/Paris Site: lat 50.25°, lon 8.49°, elevation 660 meters Astronomical darkness: Friday 2026-04-10 22:14 → Saturday 2026-04-11 04:40 (6h 26m) Moon Phase: 38% — Last Quarter • Rise 04:01 • Set 11:34 Score ≥80 = Good · 50–79 = OK · <50 = Poor — Score breakdown: Airmass 0–40 · Visibility 0–35 · Best-time 0–5 · Size 0–20 Grade Name Type Const Wdeg Hdeg MaxAlt° Airmass↓ Vis Best Local ----------------------------------------------------------------------------------------------------------------------- 100 MBM 54 Reflection Dra 10.000 6.667 80.4 1.01 395 2026-04-11 03:09 92 M 101 Galaxy UMa 0.467 0.433 86.0 0.99 395 2026-04-11 02:14 85 M 106 Galaxy CVn 0.317 0.133 86.9 0.99 395 2026-04-11 00:29 82 M 51 Galaxy CVn 0.183 0.117 86.8 0.99 395 2026-04-11 01:39 82 NGC 3718 Galaxy UMa 0.143 0.070 87.3 0.99 395 2026-04-10 23:44 81 M 63 Galaxy CVn 0.217 0.117 81.6 1.00 395 2026-04-11 01:24 81 M 108 Galaxy UMa 0.145 0.037 84.7 0.99 385 2026-04-10 23:24 81 M 109 Galaxy UMa 0.127 0.078 87.0 0.99 395 2026-04-11 00:09 81 NGC 3675 Galaxy UMa 0.098 0.062 83.2 1.00 355 2026-04-10 23:39 81 NGC 4449 Galaxy CVn 0.103 0.073 83.7 1.00 395 2026-04-11 00:39 81 NGC 4051 Galaxy UMa 0.083 0.067 84.1 1.00 395 2026-04-11 00:14 80 M 94 Galaxy CVn 0.183 0.150 80.7 1.01 395 2026-04-11 00:59 80 M 97 Planetary UMa 0.057 0.055 85.4 0.99 385 2026-04-10 23:24 80 NGC 4088 Galaxy UMa 0.097 0.037 89.6 0.98 395 2026-04-11 00:14 80 Hickson 68 GalaxyGrp CVn 0.283 0.200 80.0 1.01 395 2026-04-11 02:04 80 NGC 4100 Galaxy UMa 0.067 0.042 89.1 0.98 395 2026-04-11 00:19 79 Hickson 56 GalaxyGrp UMa 0.017 0.013 87.5 0.99 395 2026-04-10 23:44 79 NGC 4085 Galaxy UMa 0.042 0.017 89.7 0.98 395 2026-04-11 00:14 79 NGC 4217 Galaxy UMa 0.083 0.017 86.7 0.99 395 2026-04-11 00:29 79 NGC 5585 Galaxy UMa 0.083 0.067 83.6 1.00 395 2026-04-11 02:29 78 NGC 3184 Galaxy UMa 0.123 0.115 81.0 1.01 280 2026-04-10 22:29 78 NGC 4490 Galaxy CVn 0.105 0.050 81.2 1.01 395 2026-04-11 00:39 78 NGC 5907 Galaxy Dra 0.212 0.023 84.0 1.00 395 2026-04-11 03:24 77 M 102 Galaxy Dra 0.075 0.017 84.6 1.00 395 2026-04-11 03:14 77 Abell 1656 Galaxy Clus Com 1.667 1.000 67.6 1.08 385 2026-04-11 01:09 74 NGC 5371 Galaxy CVn 0.070 0.058 80.1 1.01 395 2026-04-11 02:04 73 NGC 4244 Galaxy CVn 0.277 0.045 77.4 1.02 385 2026-04-11 00:29 73 NGC 4036 Galaxy UMa 0.050 0.043 78.5 1.02 395 2026-04-11 00:14 72 NGC 4041 Galaxy UMa 0.058 0.042 78.3 1.02 395 2026-04-11 00:14 71 IC 4182 Galaxy CVn 0.095 0.078 77.2 1.02 395 2026-04-11 01:14 70 NGC 5033 Galaxy CVn 0.178 0.083 76.2 1.03 395 2026-04-11 01:24 69 NGC 3432 Galaxy LMi 0.113 0.028 76.2 1.03 295 2026-04-10 23:04 69 NGC 5005 Galaxy CVn 0.097 0.050 76.7 1.02 395 2026-04-11 01:19 69 NGC 6015 Galaxy Dra 0.083 0.037 78.0 1.02 385 2026-04-11 03:59 67 Abell 1367 Galaxy Clus Leo 1.000 0.833 59.4 1.16 270 2026-04-10 23:54 66 Virgo Cluster Galaxy Clus Vir 8.000 8.000 52.3 1.26 240 2026-04-11 00:39 66 NGC 4395 Galaxy CVn 0.217 0.167 73.1 1.04 375 2026-04-11 00:39 60 NGC 4631 Galaxy CVn 0.250 0.050 72.1 1.05 390 2026-04-11 00:54 60 Markarian's Chain GalaxyGrp Vir 2.000 0.333 52.8 1.25 245 2026-04-11 00:39 54 Leo Triplet GalaxyGrp Leo 0.677 0.846 53.0 1.25 205 2026-04-10 23:29 53 M 3 Globular CVn 0.300 0.300 68.0 1.08 385 2026-04-11 01:54 51 NGC 4274 Galaxy Com 0.100 0.067 69.2 1.07 355 2026-04-11 00:29 51 NGC 4314 Galaxy Com 0.067 0.050 69.5 1.06 360 2026-04-11 00:34 49 NGC 4245 Galaxy Com 0.050 0.033 69.2 1.07 350 2026-04-11 00:29 46 NGC 4559 Galaxy Com 0.178 0.073 67.6 1.08 360 2026-04-11 00:49 44 M 53 Globular Com 0.200 0.200 57.8 1.18 315 2026-04-11 01:24 43 NGC 4725 Galaxy Com 0.178 0.127 65.1 1.10 365 2026-04-11 00:59 41 M 64 Galaxy Com 0.167 0.083 61.3 1.14 355 2026-04-11 01:09 41 M 85 Galaxy Com 0.118 0.087 57.8 1.18 300 2026-04-11 00:34 41 NGC 4565 Galaxy Com 0.265 0.035 65.6 1.10 355 2026-04-11 00:49 40 M 100 Galaxy Com 0.123 0.105 55.4 1.21 285 2026-04-11 00:34 40 NGC 4293 Galaxy Vir 0.083 0.050 58.0 1.18 300 2026-04-11 00:34 40 NGC 4450 Galaxy Vir 0.083 0.050 56.7 1.19 300 2026-04-11 00:39 40 NGC 4494 Galaxy Com 0.067 0.058 65.4 1.10 350 2026-04-11 00:44 38 IC 3568 Planetary Cam 0.013 0.013 57.8 1.18 395 2026-04-11 00:44 38 Copeland's Septet GalaxyGrp Leo 0.067 0.050 61.4 1.14 285 2026-04-10 23:59 37 M 91 Galaxy Com 0.090 0.073 54.1 1.23 270 2026-04-11 00:44 37 M 98 Galaxy Com 0.158 0.047 54.5 1.23 270 2026-04-11 00:24 37 M 99 Galaxy Com 0.090 0.078 54.0 1.23 265 2026-04-11 00:29 36 M 88 Galaxy Com 0.115 0.062 54.0 1.23 265 2026-04-11 00:44 36 NGC 4548 Galaxy Vir 0.083 0.058 54.1 1.23 270 2026-04-11 00:44 36 NGC 4569 Galaxy Vir 0.167 0.083 52.8 1.25 250 2026-04-11 00:49 35 M 86 Galaxy Vir 0.148 0.097 52.6 1.26 240 2026-04-11 00:39 35 M 87 Galaxy Vir 0.138 0.110 52.0 1.27 240 2026-04-11 00:44 35 M 90 Galaxy Vir 0.158 0.073 52.8 1.25 250 2026-04-11 00:49 35 NGC 3344 Galaxy Leo 0.118 0.108 64.5 1.11 235 2026-04-10 22:54 34 M 84 Galaxy Vir 0.108 0.093 52.5 1.26 240 2026-04-11 00:34 34 Hickson 44 GalaxyGrp Leo 0.267 0.167 61.4 1.14 195 2026-04-10 22:29 34 NGC 4216 Galaxy Vir 0.133 0.033 52.8 1.25 250 2026-04-11 00:29 33 M 60 Galaxy Vir 0.127 0.103 51.2 1.28 225 2026-04-11 00:54 33 M 89 Galaxy Vir 0.085 0.078 52.2 1.26 240 2026-04-11 00:44 32 M 58 Galaxy Vir 0.098 0.078 51.4 1.28 225 2026-04-11 00:49 32 NGC 3628 Galaxy Leo 0.233 0.060 53.2 1.25 205 2026-04-10 23:29 32 NGC 4639 Galaxy Vir 0.050 0.033 52.9 1.25 245 2026-04-11 00:54 31 M 59 Galaxy Vir 0.090 0.062 51.3 1.28 225 2026-04-11 00:54 31 NGC 4579 Galaxy Vir 0.083 0.067 51.4 1.28 225 2026-04-11 00:49 30 M 65 Galaxy Leo 0.145 0.042 52.7 1.26 200 2026-04-10 23:29 30 M 66 Galaxy Leo 0.152 0.070 52.6 1.26 200 2026-04-10 23:29 26 M 95 Galaxy Leo 0.123 0.085 51.3 1.28 155 2026-04-10 22:54 26 M 96 Galaxy Leo 0.130 0.087 51.4 1.28 160 2026-04-10 22:59 26 M 105 Galaxy Leo 0.087 0.080 52.2 1.26 165 2026-04-10 22:59 25 M 49 Galaxy Vir 0.163 0.127 47.6 1.35 145 2026-04-11 00:39 24 NGC 4535 Galaxy Vir 0.117 0.100 47.8 1.35 150 2026-04-11 00:44 23 NGC 4698 Galaxy Vir 0.083 0.067 48.1 1.34 155 2026-04-11 00:59 ----------------------------------------------------------------------------------------------------------------------- Selection filters: • MIN_ALT = 45° — Only count visibility and scoring above this altitude. • MIN_DURATION_MIN = 15 min — Must stay ≥ MIN_ALT for at least this long. • MAX_AIRMASS = 2.00 — Must reach airmass ≤ this value (lower is better; 1.0 ≈ zenith). • EDGE_GUARD_MIN = 5 min — Best time must be ≥ this far from astro-dark edges. • REF_HOUR_LOCAL = 12:00; MIN_ALT_AT_REF = 30° — If 12:00 falls inside the window, altitude then must be ≥ 30°. • DEC_MAX_N = +90° — Declination cap disabled (no extra culling of far-north targets). • DIURNAL_SWING_MIN = 1.0° — Require at least this altitude swing in the window (rejects flat circumpolars).