Sh2-174 Valentine Rose Nebula
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Sh2-174, known as the Valentine Rose Nebula, is an unusual, large, and faint ancient planetary nebula in the constellation Cepheus, located approximately 1,000 light-years away. Its unique, off-center white dwarf star suggests interaction with the interstellar medium. The nebula is known for its distinct rose-like shape
Key Facts about Sh2-174:
- Object Type: Planetary Nebula.
- Location: Constellation Cepheus (near the North Star).
- Nickname: Valentine Rose Nebula.
- Size: Roughly 20 arc minutes in diameter.
- Magnitude: 14.75, making it a faint, difficult target to image.
- Structure: Extremely asymmetric; the white dwarf star (GD 561) is significantly off-center.
Characteristics and Observations:
- Asymmetry: Unlike most planetary nebulae where the remnant white dwarf lies in the center, Sh2-174’s white dwarf is on the edge of the nebula due to interaction with surrounding interstellar material.
- Discovery: Discovered on photographic plates by Stewart Sharpless in the 1960s, though confirmed as a planetary nebula much later.
- Imaging: Due to its low surface brightness, it requires long, deep exposures to capture the red/blue nebula details.
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