M45 - Open Cluster - Skylook.org

M45

Pleiades

Åben stjernehob Taurus Størrelsesklasse 1.2

Nuværende synlighed

Højde

71.0°

Azimut

217.8°

Excellent viewing conditions
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Objektdetaljer

Egenskab Værdi

Rise/Set Times

Tid for opgang

04:11

Tid for kulmination

11:39

Tid for nedgang

19:06

Observing Recommendations

Equipment Needed:
Difficulty: Easy
Magnification: Low (25-75x)

Observing Tips:

  • Visible to the naked eye under dark skies
  • Use low to moderate magnification
  • Look for color differences among stars
  • Great viewing conditions - fine detail should be visible

Om deep sky-data

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).

Magnitudeskala

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:

  • Højde: Objects above 30 degrees altitude are easier to observe
  • Størrelsesklasse: Brighter objects (lower magnitude) are easier to see
  • Månefase: 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.