# Abell 33

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Planetary nebula in the constellation Hydra

Abell 33 Emission nebula Planetary nebula The Abell 33 nebula as seen from Mount Lemmon Observatory Observation data: J2000 epoch Right ascension 09h 39m 09.2s Declination −02° 48′ 35″ Distance 2.7 kly (0.83 kpc) ly Apparent magnitude (V) +12.9 Constellation Hydra Notable features Foreground star gives it a "diamond ring" effect Designations PNG 238.0+34.8, PK 238+34.1, ARO 65 See also: Lists of nebulae

**Abell 33** (Also called **A33** or the **Diamond ring nebula**) is a faint spherical [planetary nebula](/source/Planetary_nebula) located 2700 light years away in the [constellation of Hydra](/source/Hydra_(constellation)). It lies just behind the star [HD 83535](/source/HD_83535) which has no relation to the nebula.[1] The [star](/source/Star) HD 83535 is also responsible for the "[diamond ring](/source/Engagement_ring)" effect seen in the photograph.

The [nebula](/source/Nebula) gets its [coloration](/source/Color) from the [O III emissions](/source/Doubly_ionized_oxygen) ([doubly ionized oxygen](/source/Doubly_ionized_oxygen)). The nebula is faint making it difficult to be seen using a [telescope](/source/Telescope). The spherical shape of Abell 33 is mainly caused by its central star not having much of a spin.[2] The nebula shares similar morphology to another nebula with the same spherical shape, the [Owl Nebula](/source/Owl_Nebula) ([M 97](/source/Owl_Nebula)), but is much darker than the Owl Nebula.[3]

There is also a galaxy cluster known as Abell 33,[4] because there are two Abell astronomical catalogs, one for planetary nebulae,[5] and one for galaxy clusters.[6]

## References

1. **[^](#cite_ref-1)** ["Abell 33 Planetary Nebula in Hydra | Astrodonimaging.com"](https://astrodonimaging.com/gallery/abell-33-planetary-nebula-in-hydra/). Retrieved 2024-05-11.

1. **[^](#cite_ref-2)** ["Abell 33 – Astrodrudis"](https://astrodrudis.com/abell-33/). Retrieved 2023-10-27.

1. **[^](#cite_ref-3)** ["Planetary Nebula Abell 33 | Deep⋆Sky Corner"](https://www.deepskycorner.ch/obj/a33.en.php). *www.deepskycorner.ch*. Retrieved 2023-10-27.

1. **[^](#cite_ref-4)** [https://simbad.cds.unistra.fr/simbad/sim-id?Ident=abell+33&submit=submit+id](https://simbad.cds.unistra.fr/simbad/sim-id?Ident=abell+33&submit=submit+id)

1. **[^](#cite_ref-5)** [https://en.wikipedia.org/wiki/Abell_Catalog_of_Planetary_Nebulae](https://en.wikipedia.org/wiki/Abell_Catalog_of_Planetary_Nebulae)

1. **[^](#cite_ref-6)** [https://en.wikipedia.org/wiki/Abell_catalogue](https://en.wikipedia.org/wiki/Abell_catalogue)

- [http://www.caelumobservatory.com/gallery/abell33.shtml](http://www.caelumobservatory.com/gallery/abell33.shtml) [Archived](https://web.archive.org/web/20170512070210/http://www.caelumobservatory.com/gallery/abell33.shtml) 2017-05-12 at the [Wayback Machine](/source/Wayback_Machine)

- [http://www.skyhound.com/observing/archives/mar/A_33.html](http://www.skyhound.com/observing/archives/mar/A_33.html)

## External links

- Media related to [Abell 33](https://commons.wikimedia.org/wiki/Category:Abell_33) at Wikimedia Commons

v t e Constellation of Hydra List of stars in Hydra Hydra in Chinese astronomy Stars Bayer α (Alphard) β γ (Naga) δ ε (Ashlesha) ζ η θ ι (Ukdah) κ λ μ ν ξ ο π ρ σ (Minchir) τ1 τ2 υ1 (Zhang) υ2 φ1 φ2 φ3 χ1 χ2 ψ ω b1 b3 C F Flamsteed 1 2 3 6 (a) 9 10 12 (D) 14 15 17 19 20 21 23 24 25 26 27 (P) 28 29 33 (A) 34 37 44 47 48 50 51 (k) 52 (l) 54 (m) 55 56 57 58 (Solitaire) 59 60 10 Crt 17 Crt 20 Crt 2 Sex Variable R U V W TW EX HS KU LQ V361 V419 V421 V478 V484 HR 3378 3538 3749 (G) 3750 3858 (I) 3862 3919 3923 (Felis) 4162 4328 4339 (β Ant) 4445 5265 HD 72659 74156 82943 86226 86264 90156 (γ Ant) Other 2MASS 1114−2618 ESO 439-26 Gliese 328 Gliese 357 Gliese 433 Gliese 453 GJ 3634 HAT-P-30 HE 1256−2738 HE 1327−2326 LHS 2065 LHS 3003 LTT 3780 SDSS J090745.0+024507 WASP-25 WASP-36 WASP-84 WASP-166 (Filetdor) WISE 0855−0714 WISEA J1141−3326 Exoplanets Gliese 357 d HD 72659 b HD 74156 b c HD 82943 b c HD 86226 b HD 86264 b TW Hydrae b (unconfirmed) WASP-193b Star clusters Messier 48 Messier 68 NGC 5694 Price-Whelan 1 Nebulae Abell 33 Abell 35 NGC 3242 Southern Owl Nebula Galaxies Messier 83 NGC 2617 2642 2697 2708 2758 2835 2848 2865 2890 2935 2936 2937 2960 2962 2986 2992 3030 3052 3054 3081 3109 3124 3200 3285 3285B 3290 3305 3307 3308 3309 3311 3312 3313 3314 3315 3316 3336 3369 3383 3393 3402 3463 3464 3585 3621 3673 3717 3904 3923 3936 4980 4993 5042 5061 5078 5085 5101 5135 5260 5264 5495 5626 Other 3C 196.1 AM 1316−241 Arp 7 CTQ 327 ESO 510-G13 GAMA202627 GLEAM J0917−0012 Hydra A IC 535 MRC 1138−262 Peekaboo Galaxy PKS 1151−348 RX J0911.4+0551 SDSS J0841+0101 TN J0924−2201 Tololo 1247−232 ZwCl 1693 BCG Galaxy clusters Abell 754 Abell 3411 Abell 3412 Bullet Group Hickson 40 Astronomical events GW170817 Category

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