# NGC 5694

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Globular cluster in the constellation Hydra

NGC 5694 The core of NGC 5694 imaged by the Hubble Space Telescope Observation data (J2000 epoch) Class VII[1] Constellation Hydra Right ascension 14h 39m 36.5s[2] Declination −26° 32′ 18.0″[2] Distance 114,100ly[1] Apparent magnitude (V) 10.2[1] Apparent dimensions (V) 3.6′[1] Physical characteristics Metallicity [Fe/H] = –1.74[3] dex Estimated age 13.44 Gyr[3] Other designations Caldwell 66 See also: Globular cluster, List of globular clusters

**NGC 5694** (also known as **Caldwell 66**) is a [globular cluster](/source/Globular_cluster) in the [constellation](/source/Constellation) [Hydra](/source/Hydra_(constellation)). It was discovered by German-British astronomer [William Herschel](/source/William_Herschel) on 22 May 1784.[4]

## Characteristics

This globular cluster is located at a distance of 114,000 light-years (35,000 pc) from the [Sun](/source/Sun) and 96,000 light-years (29,000 pc) from the [Galactic Center](/source/Galactic_Center)[5] and is one of the oldest known globular clusters in the [Milky Way Galaxy](/source/Milky_Way_Galaxy), forming nearly 12 billion years ago.[6]

Its chemical composition is highly peculiar, being highly (to nearly solar levels) enriched in [alpha elements](/source/Alpha_process), suggesting an extragalactic origin before being captured by the Milky Way.[7]

## Noctua

NGC 5694 is located below the tail of the former constellation [Noctua](/source/Noctua_(constellation)), which included faint stars within the modern [IAU borders](/source/IAU_designated_constellations) of Libra, Hydra, and Virgo.

## See also

- [NGC 4372](/source/NGC_4372)

## References

1. ^ [***a***](#cite_ref-seds_1-0) [***b***](#cite_ref-seds_1-1) [***c***](#cite_ref-seds_1-2) [***d***](#cite_ref-seds_1-3) ["Results for NGC 5694"](http://spider.seds.org/ngc/ngc.cgi?N5694). *SEDS NGC Catalog Online*. Retrieved 2010-12-07.

1. ^ [***a***](#cite_ref-simbad_2-0) [***b***](#cite_ref-simbad_2-1) ["NGC 5694"](http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+5694). *[SIMBAD](/source/SIMBAD)*. [Centre de données astronomiques de Strasbourg](/source/Centre_de_donn%C3%A9es_astronomiques_de_Strasbourg). Retrieved 2010-12-07.

1. ^ [***a***](#cite_ref-mnras404_3_1203_3-0) [***b***](#cite_ref-mnras404_3_1203_3-1) Forbes, Duncan A.; Bridges, Terry (May 2010), "Accreted versus in situ Milky Way globular clusters", *[Monthly Notices of the Royal Astronomical Society](/source/Monthly_Notices_of_the_Royal_Astronomical_Society)*, **404** (3): 1203–1214, [arXiv](/source/ArXiv_(identifier)):[1001.4289](https://arxiv.org/abs/1001.4289), [Bibcode](/source/Bibcode_(identifier)):[2010MNRAS.404.1203F](https://ui.adsabs.harvard.edu/abs/2010MNRAS.404.1203F), [doi](/source/Doi_(identifier)):[10.1111/j.1365-2966.2010.16373.x](https://doi.org/10.1111%2Fj.1365-2966.2010.16373.x), [S2CID](/source/S2CID_(identifier)) [51825384](https://api.semanticscholar.org/CorpusID:51825384).

1. **[^](#cite_ref-selig_4-0)** Seligman, Courtney. ["New General Catalogue Objects: NGC 5694"](https://cseligman.com/text/atlas/ngc56a.htm#5694). *Celestial Atlas*. Retrieved 19 January 2026.

1. **[^](#cite_ref-harris_5-0)** Harris, W.E. (1996). ["A Catalog of Parameters for Globular Clusters in the Milky Way"](http://physwww.physics.mcmaster.ca/%7Eharris/mwgc.dat). *The Astronomical Journal*. **112**: 1487. [Bibcode](/source/Bibcode_(identifier)):[1996AJ....112.1487H](https://ui.adsabs.harvard.edu/abs/1996AJ....112.1487H). [doi](/source/Doi_(identifier)):[10.1086/118116](https://doi.org/10.1086%2F118116).

1. **[^](#cite_ref-ngc-ic-project_6-0)** ["NGC/IC Project"](https://web.archive.org/web/20120520010558/http://www.ngcicproject.org/ngcicdb.asp). *Results for NGC 5694*. Archived from [the original](http://www.ngcicproject.org/ngcicdb.asp) on 2012-05-20. Retrieved 2010-12-07.

1. **[^](#cite_ref-7)** Mucciarelli, A.; Bellazzini, M.; Catelan, M.; Dalessandro, E.; Amigo, P.; Correnti, M.; Cortés, C.; d'Orazi, V. (2013), "NGC 5694: Another foster son of the Galactic halo★", *Monthly Notices of the Royal Astronomical Society*, **435** (4): 3667–3680, [arXiv](/source/ArXiv_(identifier)):[1308.6653](https://arxiv.org/abs/1308.6653), [doi](/source/Doi_(identifier)):[10.1093/mnras/stt1558](https://doi.org/10.1093%2Fmnras%2Fstt1558)

## External links

- Media related to [NGC 5694](https://commons.wikimedia.org/wiki/Category:NGC_5694) at Wikimedia Commons

- NGC 5694 on [WikiSky](/source/WikiSky): [DSS2](http://www.wikisky.org/?object=NGC+5694&img_source=DSS2), [SDSS](http://www.wikisky.org/?object=NGC+5694&img_source=SDSS), [GALEX](http://www.wikisky.org/?object=NGC+5694&img_source=GALEX), [IRAS](http://www.wikisky.org/?object=NGC+5694&img_source=IRAS), [Hydrogen α](http://www.wikisky.org/?object=NGC+5694&img_source=HALPHA), [X-Ray](http://www.wikisky.org/?object=NGC+5694&img_source=RASS), [Astrophoto](http://www.wikisky.org/?object=NGC+5694&img_source=IMG_all), [Sky Map](http://www.wikisky.org/?object=NGC+5694), [Articles and images](http://www.wikisky.org/starview?object=NGC+5694)

v t e Astronomical catalogs NGC NGC 5689 NGC 5690 NGC 5691 NGC 5692 NGC 5693 NGC 5694 NGC 5695 NGC 5696 NGC 5697 NGC 5698 NGC 5699 Caldwell C57 C58 C59 C60 C61 C62 C63 C64 C65 C66 C67 C68 C69 C70 C71 C72 C73 C74 C75

v t e Caldwell catalogue List C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 C13 C14 C15 C16 C17 C18 C19 C20 C21 C22 C23 C24 C25 C26 C27 C28 C29 C30 C31 C32 C33 C34 C35 C36 C37 C38 C39 C40 C41 C42 C43 C44 C45 C46 C47 C48 C49 C50 C51 C52 C53 C54 C55 C56 C57 C58 C59 C60 C61 C62 C63 C64 C65 C66 C67 C68 C69 C70 C71 C72 C73 C74 C75 C76 C77 C78 C79 C80 C81 C82 C83 C84 C85 C86 C87 C88 C89 C90 C91 C92 C93 C94 C95 C96 C97 C98 C99 C100 C101 C102 C103 C104 C105 C106 C107 C108 C109 See also Messier Catalogue Catalogue of Nebulae and Clusters of Stars New General Catalogue Index Catalogue Revised New General Catalogue Herschel 400 Catalogue Category Commons Portal

v t e New General Catalogue 5001 to 6000 5001 to 5100 5001 5002 5003 5004 5005 5008 5010 5011 5018 5020 5023 5024 5026 5030 5032 5033 5034 5042 5050 5053 5054 5055 5068 5078 5084 5085 5087 5090 5091 5098 5101 to 5200 5101 5102 5112 5114 5121 5128 5135 5139 5144 5161 5162/5174 5164 5170 5177 5185 5189 5194 5195 5198 5201 to 5300 5201 5204 5221 5223 5229 5235 5236 5238 5247 5248 5251 5252 5253 5256 5257 5258 5260 5264 5272 5273 5278 5279 5281 5286 5291 5300 5301 to 5400 5307 5308 5314 5315 5316 5322 5331 5334 5335 5343 5363 5364/5317 5371 5377 5384 5390 5394 5395 5398 5401 to 5500 5406 5408 5410 5416 5419 5422 5426 and 5427 5448 5455 5457 5460 5461 5466 5468 5470 5471 5473 5474 5475 5477 5483 5485 5486 5490 5493 5495 5500 5501 to 5600 5501 5502/5503 5504 5506 5508 5514 5516 5523 5529 5530 5532 5533 5535 5539 5541 5544 5545 5548 5557 5559 5566 5575/5578 5579 5582 5584 5585 5591 5597 5601 to 5700 5601 5605 5609 5613 5614 5615 5617 5619 5626 5629 5630 5634 5640 5641 5643 5653 5662 5665 5668 5676 5678 5679 5682 5683 5694 5701 to 5800 5701 5705 5713 5714 5719/5658 5722 5728 5746 5749 5750 5752 5753 5754 5755 5765 5772 5774 5775 5777 5778 5784 5790 5792 5793 5801 to 5900 5806 5820 5821 5822 5823 5824 5829 5837 5838 5844 5846 5850 5854 5856 5857 5861 5866 5875 5876 5879 5882 5885 5886 5890 5896 5897 5898 5901 to 6000 5904 5906 5907 5910 5915 5917 5920 5921 5925 5927 5928 5929 5930 5936 5939 5940 5949 5953 5957 5962 5963 5964 5965 5966 5970 5979 5980 5982 5985 5986 5988 5996 5999 6000 Astronomical catalog List of NGC objects 5001–6000

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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Adapted from the Wikipedia article [NGC 5694](https://en.wikipedia.org/wiki/NGC_5694) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/NGC_5694?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.