Astronomy:NGC 7094

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NGC 7094
Nebula
File:NGC 7094 PanS.jpg
The planetary nebula NGC 7094 as observed by the Pan-STARRS astronomical survey.
Observation data: J2000 epoch
Right ascension21/36/52.970[1]
Declination12/47/19.10[1]
Distance5400 +320−285 ly[2] ly   (1655 +97−87 pc[2] pc)
Apparent magnitude (V)13.4[3] · [4]
Apparent diameter1.57′[3] · [4]
ConstellationPegasus
Physical characteristics
Radius0.393[5] pc
Absolute magnitude (V)0.10 +0.54−0.72
Dimensions2.34 +0.15−0.13 ly
Notable features[5]
DesignationsPK 62+9.1
CS=16.0 [3]
WD 2134+125
IRAS 21344+1233
G066.7-28.2
2MASS J21365296+1247190
WISE J213652.95+124719
Gaia DR3 1770058865674512896[6]
NVSS J213652+124728
2CXO J213652.9+124718[1]
See also: Lists of nebulae

NGC 7094 is a planetary nebula located in the constellation of Pegasus. NGC 7094 was discovered by the American astronomer Lewis Swift on 10 October 1884.[7]

Observation

With an apparent visual magnitude of 13.4, a telescope with an aperture of at least 250 mm (9.8 in) is required to observe it.[4]

File:NGC 7094 Stellarium.jpg
Location of NGC 7094 in the Pegasus constellation (Stellarium).
File:NGC 7094 PanS Position.jpg
Position of NGC 7094 relative to a star in Pegasus and the globular cluster M15.

The nebula NGC 7094 is located about 3.4 degrees northwest of Enif (Epsilon Pegasi) and about 1.8 degrees northeast of the globular cluster M15.

Characteristics

Distance, size, and velocity

The online software Aladin Lite allows querying astronomical data from several catalogs, including the "GAIA EARLY DATA RELEASE 3 (GAIA EDR3)".[8] The parallax of NGC 7094 is 0.6042 ± 0.0336 ms (0.0006042 ± 3.36×10−5 s),[2] corresponding to a distance of 1655 +97−87 pc.

The Simbad database lists four distance values:[6] 1.382 ± 0.276 kpc (4.51 ± 0.90 kly),[9] 1,655.081 ± 92.0403 pc (5,398.152 ± 300.195 ly),[10] 1,626.2807 ± 155.2491 pc (5,304.218 ± 506.355 ly)[11] and 1,358 pc (4,430 ly).

The apparent size of the nebula is 1.57 arcminutes, which corresponds to a physical size of 2.34 +0.15−0.13 ly. The nebula's radius is estimated at 0.393 pc.[5]

Two highly uncertain velocity values are reported in Simbad: 2 ± 72 km/s (1.2 ± 44.7 mi/s)[12] and −1 ± 34 km/s (−0.62 ± 21.13 mi/s).[13]

Age

The age of NGC 7094 is approximately 7770 years.[5]

Central star

The central star of NGC 7094 is a PG 1159 star, which is a transitional star evolving toward a white dwarf stage.[14]

Its visual magnitude is 13.59, with an estimated mass of 1.791 M⊙. Its surface temperature reaches 110 kK (109,730 °C; 197,540 °F) (Log(Teff)=5.04) and its luminosity is 5129 L⊙ (Log(L/L⊙)=3.71).[5]

References

  1. ↑ 1.0 1.1 1.2 "Results for object NGC 7094" (in en). NASA/IPAC Extragalactic Database. https://ned.ipac.caltech.edu/byname?objname=NGC+7094&hconst=67.8&omegam=0.308&omegav=0.692&wmap=4&corr_z=1. 
  2. ↑ 2.0 2.1 2.2 "NGC 7094" (in en). Aladin Lite, Centre de données astronomiques de Strasbourg. https://aladin.cds.unistra.fr/AladinLite/?target=NGC%207094. 
  3. ↑ 3.0 3.1 3.2 "Data from "Revised NGC and IC Catalog by Wolfgang Steinicke", NGC 7000 to 7099" (in en). Astronomy course website, Cégep de Valleyfield. https://astrovalleyfield.com//AstronomieCompl/NGC%20et%20autres/WolfgangS/N7000_exc_web.htm. 
  4. ↑ 4.0 4.1 4.2 "NGC 7094 - Planetary Nebula in Pegasus" (in en). The Sky Live. https://theskylive.com/sky/deepsky/ngc7094-object. 
  5. ↑ 5.0 5.1 5.2 5.3 5.4 González-Santamaría, I.; Manteiga, M.; Manchado, A.; Ulla, A.; Dafonte, C.; López Varela, P. (2021). "Planetary nebulae in Gaia EDR3: Central star identification, properties, and binarity". Astronomy & Astrophysics 656: A51. doi:10.1051/0004-6361/202141916. https://www.aanda.org/articles/aa/pdf/2021/12/aa41916-21.pdf. 
  6. ↑ 6.0 6.1 "NGC 7094 -- Planetary Nebula" (in en). Simbad. https://simbad.u-strasbg.fr/simbad/sim-id?Ident=%402740651&Name=NGC++7094&submit=display+all+measurements#lab_meas. 
  7. ↑ Courtney Seligman. "Celestial Atlas Table of Contents, NGC 7050-7099" (in en). http://cseligman.com/text/atlas/ngc70a.htm#7094. 
  8. ↑ ESA, ed. "GAIA EARLY DATA RELEASE 3 (GAIA EDR3)" (in en). https://www.cosmos.esa.int/web/gaia/earlydr3. 
  9. ↑ Stanghellini, L.; Haywood, M. (2010). "The Galactic structure and chemical evolution traced by the population of planetary nebulae". The Astrophysical Journal 714 (2): 1096–1107. doi:10.1088/0004-637X/714/2/1096. 
  10. ↑ Brown, A.G.A. et al. (2021). "Gaia Early Data Release 3, Summary of the contents and survey properties". Astronomy & Astrophysics 649 (A1): 20 pages. doi:10.1051/0004-6361/202039657. 
  11. ↑ Brown, A.G.A. et al. (2018). "Gaia Data Release 2. Summary of the contents and survey properties". Astronomy & Astrophysics 616 (A1): 22 pages. doi:10.1051/0004-6361/201833051. 
  12. ↑ Luo, Yangping; Nemeth, Peter; Wang, Kun; Wang, Xi; Han, Zhanwen (2021). "Hot subdwarf Atmospheric parameters, Kinematics, and Origins -- Based on 1587 hot subdwarf stars observed in Gaia DR2 and LAMOST DR7". The Astrophysical Journal Supplement Series 256 (2): 34. doi:10.3847/1538-4365/ac11f6. 
  13. ↑ Luo, Yangping; Németh, Péter; Deng, Licai; Han, Zhanwen (2019). "Hot Subdwarf Stars Observed in Gaia DR2 and LAMOST DR5". The Astrophysical Journal 881 (1): 16 pages. doi:10.3847/1538-4357/ab298d. 
  14. ↑ Ziegler, M.; Rauch, T.; Reiff, E.; Werner, K.; Kruk, J. W.; Oliveira, C. M. (2007). "UV and FUV Spectroscopy of the Hybrid PG 1159-Type Central Star of NGC 7094". Hydrogen-Deficient Stars ASP Conference Series 391: 125. 



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