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Type: galaxy (Seyfert), Sb
Mag: B=11.03, V=10.1
Size: 6.76′ x 4.786′
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Dunlop, J. (1828) A Catalogue of Nebulae and Clusters of Stars in the Southern Hemisphere, Observed at Paramatta in New South Wales. Phil. Trans. Roy. Soc., 118, 113-151. [1828RSPT..118..113D]
This object is possibly Dunlop 296, discovered by James Dunlop from Paramatta, New South Wales, using a 9-inch f/12 telescope. He described it as "a faint ill-defined nebula, with a small bright point in the preceding side, which I suspect to be a star; there are several similar small stars in the field."
John Herschel recorded it as "B, L, pmE, svmbM to a nucleus; 2.5' long, 1.5' broad; a star 12th mag involved." On a second occassion he called it "B, L, mE, first gradually then psmbM, 4' long, 1,5' broad."
Table IV: !! 2-br spiral, iF.
Reynolds, J.H. (1921) The spiral nebulae in the zone -40° to -90° (from the Franklin-Adams Plates). MNRAS, 81, 598.
p 600: "The following spirals call for special description on account of their size:
Irregular, S-shaped, with considerable hazy extension."
table p601 6x4, "B, S type"
(Sulentic and Tifft 1973) notes that this is a 11.5 mag galaxy.
(1975(Astrophysical Journal, 202, 563-582) notes that this galaxy is a member of the Dorado Group. Members include NGC 1515, NGC 1533, NGC 1536, NGC 1543, NGC 1546, NGC 1553, NGC 1566, NGC 1574, NGC 1596, NGC 1617 and IC 2056. Possible additional members include NGC 1559, NGC 1602, NGC 1672, NGC 1688, NGC 1703 & NGC 1705
de Vaucouleurs, G. (1975) Nearby groups of galaxies. In: Kuiper, G. (ed) Stars and Stellar Systems. Volume 9: Galaxies and the Universe. Chapter 14, p557.
Part of the Dorado cloud complex (NGC 1566, NGC 1433, NGC 1672 groups). ... the southern group, NGC 1672, is partly covered by the LMC.
Brightest members: 1559 ( B(0) = 11.06), 1672 ( B(0) = 11.29), 1688 ( B(0) = 12.66), 1796 ( B(0) = 13.18), NGC 1703 (no mag given).
("Galaxies and the Universe", Chapter 14 - Nearby Groups of Galaxies) notes that the five brightest members of the NGC 1672 Group, a part of the Dorado Cloud complex, are NGC 1559, NGC 1672, NGC 1688, NGC 1796 & NGC 1703.
"Survey of bright galaxies south of -35° declination", Mem. Mount Stromlo, No. 13. (photographic study, plates taken with the 30-inch Reynolds reflector, 20-inch diaphragm).
Hartung notes: "only the brighter central region is visible with 30cm as a fairly bright haze 3' x 2' in pa 60 deg, with a well-defined small nucleus. 15cm shows the general form but it is only a faint hazy spot with 10.5cm."
15cm - nice fairly br, lg modlosfcbr spir @ 80x, sev *s sup. 140x: spir struc clearly vis: br bar elong pa90 contains vbr sub*ar nuc. wk Srn arm goes S then E from W end of bar, ends N of m13 * nr V=15.0 * (T&B, vis at 140x). brtr Nrn arm goes N then W from E end of bar, covering V=12.8 and V=12.4 *s. ends nr V=12.4 *, but brtr patch NW shown on T&B chart also vis. 5' diam overall. BS, 11Nov1993, LCO.
ASV Journal Vol 24 No 3 June 1971: "perceptible in 3-inch."
[amastro] posting, Apr 30, 2008
04 45 42.5 -59 14 50 V = 9.7; Size 6.6x5.5; Surf Br = 13.4; PA = 170d
24" (4/5/08): this gorgeous barred spiral appeared very bright and large with the main body elongated E-W, ~3.5'x2.0'. An obvious spiral arm is attached at the east end of the E-W bar and hooks to the north, wrapping around a star to the NE of the bar. Three additional fainter stars are sandwiched to the west of the brighter star, between the arm and the bar. A second arm begins to emerge on the west side, barely sweeping towards the south, but then quickly terminates. So the second "arm" is really more of a hooking appendage off the west end. The central bar itself is sharply concentrated with a dramatic, brilliant nucleus, ~25" diameter, that increases gradually to the center. This galaxy is a member of the Dorado group which includes N1515, N1533, N1536, N1543, N1546, N1553, N1566, N1574, N1596, N1617 and IC 2056. Possible additional members include N1559, N1602, N1672, N1688, N1703 and N1705.
1997 November 3/4, Jonkershoek. 11x80 tripod-mounted, seeing 4, transparency 3, darkness 3, lim mag = 6.0 (naked eye, pole) "Stonesthrow north of kappa Dor. Readily seen as an irregularly round glow, within a narrow triangle of 9.5 magnitude stars. About 45 arcseconds across."
1997 November 25, Jonkershoek. 11x80 tripod-mounted, seeing 4, transparency 3, darkness 3, lim mag = 6.0 (naked eye, pole), very strong SE wind (gale force along the coast) "Found while sweeping, confirmed on starmap. Third of three in a short curve, other two being stars. Small, round nebulous glow, distinctly seen with averted vision."
Location: Pietersburg South 23o 53. East 29o 28.
Sky conditions: Clear.
Date: 4 Julie 1997.
Field of view: 52.7 arc minutes.
ASSA-DSO - Report J
NGC 1672 Mag 11 size 4
Small, fairly bright, uneven roundish galaxy with a bright central region in a star rich field.
12-inch f/10 SCT (EP: 2-inch 40mm SW 76x 53' fov; 2-inch 32mm SW 95x 42' fov; 2-inch 14mm UW 218x 23' fov)
Round in appearance with a soft yet slightly brighter centre. Ruff –looking northwestern section, which seems frayed (218x). Situated within a lovely star field with faint stars fairly close by and scattered in the field of view. To complete the picture is a 6.7 magnitude star, about 12' arc min. northeast.
Sky Conditions:The fainter parts of the Milky Way are barely visible.Haziness only visible on the horizon.Atmosphere stable with little interference.
This galaxy has an oval shape which looks almost like an out of focus baked bean at 75x.The nucleus of this galaxy is tightly concentrated in the center whereby there are plenty of darker areas within the far outskirts of this galaxy.The nucleus of this galaxy grows very bright in the center compared to the far outskirts of this galaxy.This galaxy measures 6.2'x 1.2'with PA NE-to-SW.Challenge Rating:Moderately Difficult.Chart:No.122,NSOG Vol.3
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