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NGC 5527 (12,202 of 18,816)

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NGC 5527

NGC 5527, MCG+06-31-081, LEDA 50868, GC 3821

RA: 14h 14m 27.3s
Dec: +36° 24′ 15″

Con: Bo÷tes
Ch: MSA:627, U2:110, SA:7

Ref: NGC/IC

(reference key)

Type: galaxy, Sbc

Mag: B=15.2, V=14.4

Size: 0.8′ x 0.7′
PA: 160°

History and Accurate Positions for the NGC/IC Objects (Corwin 2004)

NGC 5527 is probably the object called "NGC 5524" by virtually everybody. Found by LdR on 19 April 1855, it has just the one observation recorded under LdR's entry for NGC 5529. That observation reads, "[NGC 5529], long narrow ray with a S, R, vF neb sf; another vF about 15' np [5529]; and another eeF about 6' p and 1' n of this last." Dreyer adds the note, "The positions given in the G.C. for 2 R. novae, [5524] and [5527], are not in accordance with this."

In the observation, it's clear that there are four nebulae in the field. One of these, the "S, R, vF neb sf" is neither in GC nor NGC (it is one of several nebulae known to Dreyer that he did not include in NGC). The other three nebulae, N5524, N5527, and N5529 are arranged along a curve according to LdR's description. It is also clear that the new objects can have only approximate positions as no micrometric positions for them were measured at Birr Castle.

An additional problem concerns the adopted positions and descriptions. The positions are by JH for GC and, as Dreyer noted, do not correspond with the description given by LdR. Dreyer switched the positions for NGC, but still got LdR's descriptions of brightness reversed -- the faintest object is clearly the western most of the objects, i.e. NGC 5524.

Given all this, it is reasonable to suppose that the brightest object northwest of NGC 5529 is NGC 5527, and that a still fainter object is west- northwest of it. This makes N5527 = CGCG 191-067 (it is 17.2 arcmin from N5529), but leaves the position for NGC 5524 vacant. The object was taken to be a star by Carlson, and was noted in MCG as "Not found." There is a very faint galaxy in the right direction from N5527 that LdR might have seen, but it is almost 13 arcmin away, not 6+ arcmin as in the observation. There is also a somewhat brighter triple star on to the northwest of N5527 (14 11 42.2, +36 43 48; B1950.0, mean of the three DSS positions), but it is 9.5 arcmin from the galaxy, and is probably too bright to be called "eeF." The stars are also pretty well separated: the northern star is 30 arcsec away from the southern.

The final possibility, the one I've adopted, is the double star 7.9 arcmin west-southwest of N5527. This is a reasonable choice if LdR's description reads "... another eeF about 6' p and 1' s...." The second star of this pair is much fainter than the brighter, but may have added just a hint of nebulosity to the object. While this identity is a (reasonable) guess, it is still the best of the available options.

Published comments

Sulentic & Tifft (1973)

The RNGC (Sulentic and Tifft 1973) notes that this is a 16.0 mag galaxy. Their coded description reads VF,DIF.

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