M31 - Galaxy - Skylook.org

M31

Andromeda Galaxy

Galaxia Andromeda Magnitude 3.44

Uneko ikusgarritasuna

Altuera

52.5°

Azimuta

289.1°

Good viewing conditions
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Objektuaren xehetasunak

Propietatea Balioa

Rise/Set Times

Irteera-ordua

23:25

Trantsito-ordua

08:34

Ezarpenak

17:43

Observing Recommendations

Equipment Needed:
Difficulty: Easy
Magnification: Low to Moderate (50-150x)

Observing Tips:

  • Visible to the naked eye under dark skies
  • Look for spiral structure or dust lanes with larger telescopes
  • Best viewed during new moon for contrast
  • Great viewing conditions - fine detail should be visible

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Data Sources

Deep sky object data is compiled from authoritative astronomical catalogs including NGC (New General Catalogue), IC (Index Catalogue), Messier, and Caldwell. Primary source: OpenNGC.

Coordinate Systems

Right Ascension (RA): Celestial longitude measured in hours, minutes, and seconds (0h to 24h).

Declination (Dec): Celestial latitude measured in degrees, arcminutes, and arcseconds (-90 to +90 degrees).

Magnitude-eskala

The astronomical magnitude scale is logarithmic. Lower values = brighter objects. The formula relating magnitude difference to brightness ratio:

\[m_1 - m_2 = -2.5 \times \log_{10}\left(\frac{F_1}{F_2}\right)\]

where m is magnitude and F is flux.

Observing Recommendations

Recommendations are calculated based on:

  • Altuera: Objects above 30 degrees altitude are easier to observe
  • Magnitude: Brighter objects (lower magnitude) are easier to see
  • Ilargi-fasea: Dark skies (new moon) improve visibility of faint objects

Rise and Set Times

Calculated using Skyfield astronomical library with observer's location and date. Times shown in local timezone. Objects are considered visible when altitude is above 0 degrees.

Best Viewing Time

Determined by finding when the object reaches maximum altitude (culmination) during nighttime hours. Calculated as:

\[t_{\text{best}} = \arg\max_{t \in \text{night}} h(t)\]

where h(t) is altitude as a function of time.