sponsored by psychohistorian.org
|Citation||Melotte, P.J. (1926) New nebulae shown on Franklin-Adams Chart plates. MNRAS, 86(8), 636-638.|
By P. J. Melotte. (Plate 15.)
The following nebulae, which do not appear to have been recorded elsewhere, were noted when drawing up the Catalogue of Star Clusters shown on Franklin-Adams Charts Plates. They were also independently noted by Dr. Lundmark when examining the same plates. The positions given are for the epoch 1900.0.
Extended Nebula in Vela.
Centre (1900.0) R.A. 8h 31m. Dec. −44° 20′.
(1 reseau interval is equal to 1°.)
R.A. 5h 21m.4
Dec. +8° 19′
R.A. 5h 15m.9 Dec. +8° 13′
Diffuse nebula on south preceding side of B.D. +8°, 933 (mag. 6.5) with which it appears to be associated. The brightest part is roughly pear-shaped, with the pointed end in the direction of the star. There is a noticeable falling-off in star density in the area surrounding the nebula, particularly to the south-west, where there is a strongly marked vacant space over one degree square. A fifteenth magnitude star is near the centre of the brightest part of the nebula, approximately 5′ west and 4′ south of B.D. 8°,933. The nebula is well shown on F.A. Chart 121, where it falls near the edge of the plate, and it also appears on Chart 97, but somewhat fainter. The fact that this nebula has not been noted before might be explained if it proved to be variable.
R.A. 8h 33m
Dec. −44° 21′
R.A. 8h 30m. Dec. −44° 0′. (See Plate 15.)
Large extended nebula in Vela. The nebula lies between R.A. 8h 22m and 8h 39m, and extends from Dec. −42° 0′ to −46° 30′. It consists of a number of bright nebulous streaks, some of the brightest of which outline an area, seven square degrees in extent, roughly oval in form. The brightest part lies between the two stars at α 8h 26m.0, δ −44° 23′ (mag. 5.1) and α 8h 34m.2, δ −42° 38′ (mag. 4.1), e Velorum, where there are several branches of the nebula. There is much bright diffuse nebula to the south of the area indicated by the limits given above, but its appearance on the plate is confused by the densely crowded star-field. A number of stars in the region are nebulous or show traces of nebulosity near them, of which the following may be noted :–
|6.4||8 25.7||−43 50||−43, 2636||5.5||8 37.3||−46 17||−46, 2805|
|8.2||8 26.0||−41 11||−41, 2599||6.0||8 37.9||−46 57||−46, 2819|
|5.9||8 26.0||−44 23||−44, 2667||6.0||8 38.5||−45 3||−44, 2936|
|8.0||8 26.2||−43 46||−43, 2645||7.9||8 40.9||−40 55||−40, 2824|
|6.4||8 25.9||−47 36||−47, 2296||4.8||8 42.5||−45 40||−45, 3014|
|7.3||8 28.0||−47 32||−47, 2348||5.2||8 34.8||−42 43||−42, 2754|
|9.4||8 31.8||−40 19||−40, 2666*|
* N.G.C. 2626.
The magnitudes and numbers are from the Cape Photographic Durchmusterung.
R.A. 11h 08m
Dec. −77° 39′
R.A. 11h 5.3m. Dec. −77° 7′.
Nebulous star surrounded with bright nebula (C.P.D. −76°, 654, mag. 8.5). Falls near centre of a vacant area 2.2 square degrees in extent. There is a small patch of nebula near a twelfth magnitude star at α 11h 3m, δ −76° 48′. A bright nebula (H.A., lx. 6, p. 161, No. 352) is at the northern end of the vacant area. The obscuration is well defined amongst the surrounding star-field and contains some traces of faint nebulosity in addition to those given above.
R.A. 00h 02m
Dec. −15° 26′
R.A. 23h 56m.9. Dec. −15° 59′.
Faint nebula, 10′ x 2′.5. A faint star (mag. 15.5) is at the centre, and another star (mag. 16) falls at the southern edge. The nebula is condensed towards the centre, and the southern half appears brighter than the northern. The star distribution in the surrounding area is irregular, the region on the following side being almost devoid of stars. The appearance of this nebula and of Barnard's Nebula, N.G.C. 6822, is strikingly similar on the plates. The galactic co-ordinates are: Long. 47°, Lat. −74°.
Document type: Journal article.
Document source: Private collection, AS
Keyed in: AS
Online version: 2010 July 13
DOCdb is still in beta-release.
Known issues, feature requests, and updates on bug fixes, are here:
Found a bug? Have a comment or suggestion to improve DOCdb? Please let us know!
DOCdb is a free online resource that exists to promote deep sky observing.
You could help by sharing your observations, writing an article, digitizing and proof-reading historical material, and more.
Everything on DOCdb.net is © 2004-2010 by Auke Slotegraaf, unless stated otherwise or if you can prove you have divine permission to use it. Before using material published here, please consult the Creative Commons Attribution-Non-Commercial-Share Alike 2.5 License. Some material on DOCdb is copyright the individual authors. If in doubt, don't reproduce. And that goes for having children, too. Please note that the recommended browser for DOCdb is Firefox 3.x. You may also get good results with K-Meleon. Good luck if you're using IE. A successful experience with other browsers, including Opera and Safari, may vary.