Mz 1

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**Menzel 1**
Observation data (Epoch J2000)
Planetary nebula	Lists of nebulae

Right ascension	15^h 34^m 17.002^s^[1]
Declination	-59° 09′ 09.05″^[1]
Distance	3,400 ± 500 ly (1,050 ± 150 pc)^[2]
Apparent magnitude (V)	12.0^[3]
Apparent dimensions (V)	76″^[2] × 23″^[3]
Constellation	Norma
Physical characteristics
Radius	0.63 ± 0.09 ly^[a]
Absolute magnitude (V)	1.9 ± 0.3^[b]
Notable features
Other designations	ESO 135-11^[1]

Mz 1 (Menzel 1) is a bipolar planetary nebula (PN) in the constellation Norma.

1 Characteristics
2 History
3 External links
4 Notes
5 References

[edit] Characteristics

Menzel 1 is a bright PN that has a prominent central ring of enhanced emission. One model of its structure is a 3 dimensional hour-glass shape with a smoothly decreasing density starting from the waist or equator as measured outwardly to the poles. It is radially expanding at a rate of about 23 km/s and estimated to be around 4,500 to 10,000 years old and has its polar axis oriented at an angle of around 40° from the plane of the sky. Its central star is estimated to have a mass of 0.63 ± 0.05 M_⊙. In 1992 Schwarz, Corradi, & Melnick published narrow band images of Mz 1 in Hα and [OIII]. H₂ emission was observed in Mz 1 by Webster, Payne, Storey, Dopita (1988). However, despite its relative brightness, Mz 1 has only been studied in a few papers. (Monteiro et al. 2005)

[edit] History

Mz 1 was discovered by Donald Howard Menzel in 1922.(Menzel 1922)

[edit] External links

[edit] Notes

^{^} 3,400 ± 500^[2] ly distance × sin( 76″^[2] diameter_angle / 2 ) = 0.63 ± 0.09 ly. radius
^{^} 12.0^[3] apparent magnitude - 5 * (log₁₀(1,050 ± 150^[2] pc distance) - 1) = 1.9 ± 0.3 absolute magnitude