Timezone: Europe/Paris
Site: lat 50.25°, lon 8.49°, elevation 660 meters
Astronomical darkness: Thursday 2026-05-14 23:50 → Friday 2026-05-15 02:54  (3h 04m)
Moon Phase: 3% — New Moon  •  Rise 04:07  •  Set 18:20

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      
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97     MBM 54                           Reflection   Dra   10.000   6.667    80.4     1.01      190    2026-05-15 00:55
82     M 101                            Galaxy       UMa   0.467    0.433    86.0     0.99      190    2026-05-15 00:00
69     NGC 5585                         Galaxy       UMa   0.083    0.067    83.6     1.00      190    2026-05-15 00:15
67     NGC 5907                         Galaxy       Dra   0.212    0.023    84.0     1.00      190    2026-05-15 01:10
66     M 102                            Galaxy       Dra   0.075    0.017    84.6     1.00      190    2026-05-15 01:05
62     M 13                             Globular     Her   0.333    0.333    76.2     1.03      190    2026-05-15 02:40
59     Abell 2151                       Galaxy Clus  Her   1.500    1.000    57.4     1.18      190    2026-05-15 02:00
58     NGC 6015                         Galaxy       Dra   0.083    0.037    78.0     1.02      190    2026-05-15 01:45
50     Abell 2218                       Galaxy Clus  Dra   0.100    0.100    74.1     1.04      190    2026-05-15 02:30
29     Abell 39                         Planetary    Her   0.048    0.048    67.6     1.08      190    2026-05-15 02:25
23     NGC 6210                         Planetary    Her   0.007    0.007    63.5     1.12      190    2026-05-15 02:40
21     IC 4593                          Planetary    Her   0.028    0.027    51.8     1.27      165    2026-05-15 02:10
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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).