Corrigendum in the "Results of Astronomical Observations at the Cape of Good Hope." Appendix D. p. 449

Herschel, John Frederick William

doi:10.1093/mnras/34.6.302

Cited by 12 publications

(24 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An examination of this resource has revealed an important new data set of η Carinae’s brightness in 1842–43, compiled by Smyth (1843), which has now been fully reduced. This data set was not summarized by Herschel (1847), and it was not available at the time Frew (2004) compiled the historical light curve for η Car. We also took the opportunity to examine relevant letters in the Royal Society Archives that were available on microfilm from the University Publications of America (Crowe 1990; Kesaris 1990).…”

Section: Observationsmentioning

confidence: 99%

“…Herschel (1847) had mistakenly recorded the wrong date (1843 Mar 19) for this observation when compiling his summary of the available data. The summary table in Herschel (1847, p. 36) records the observation as being made on 1842 Mar 19, but the specific wording in the text of Herschel (1847, p. 35) led Müller & Hartwig (1918) and Frew (2004) to assume that the year was in fact 1843. Furthermore, the extensive series of observations recorded in the letter by Maclear (1843) includes no such date.…”

Section: Observationsmentioning

confidence: 99%

“…Some of the other data have been modified from Frew (2004). In some cases, the descriptions of Herschel (1847) were found to be a brief summary of the data contained in the original letters. The new, original estimates of Maclear and Smyth have allowed a greater density of points to be plotted during the crucial early stages of the 1843 brightening (see Table 2).…”

Section: Observationsmentioning

confidence: 99%

See 2 more Smart Citations

A revised historical light curve of Eta Carinae and the timing of close periastron encounters

Smith

Frew

2011

Monthly Notices of the Royal Astronomical Society

108

191

View full text Add to dashboard Cite

The historical light curve of the 19th century ‘Great Eruption’ of η Carinae provides a striking record of the violent instabilities encountered by massive stars. In this paper, we report and analyse newly uncovered historical estimates of the visual brightness of η Car during its eruption, and we correct some mistakes in the original record. The revised historical light curve looks substantially different from previous accounts; it shows two brief precursor eruptions in 1838 and 1843 that resemble modern supernova impostors, while the final brightening in 1844 December marks the time when η Car reached its peak brightness. We consider the timing of brightening events as they pertain to the binary system in η Car. (1) The brief 1838 and 1843 events rose to peak brightness within weeks of periastron passages if the pre‐1845 orbital period was ∼5 per cent shorter than that at present due to the mass‐loss of the eruption. Each event lasted only ∼100 d. (2) The main brightening at the end of 1844 has no conceivable association with periastron, beginning suddenly more than 1.5 yr after periastron. It lasted ∼10 yr, with no obvious influence of periastron encounters during that time. (3) The 1890 eruption began to brighten at periastron, but took over 1 yr to reach maximum brightness and remained there for almost 10 yr. A second periastron passage mid‐way through the 1890 eruption had no visible effect. While the evidence for a link between periastron encounters and the two brief precursor events is compelling, the differences between the three cases above make it difficult to explain all three phenomena with the same mechanism.

show abstract

Section: Observationsmentioning

confidence: 99%

Section: Observationsmentioning

confidence: 99%

Section: Observationsmentioning

confidence: 99%

See 1 more Smart Citation

A revised historical light curve of Eta Carinae and the timing of close periastron encounters

Smith

Frew

2011

Monthly Notices of the Royal Astronomical Society

108

191

View full text Add to dashboard Cite

show abstract

“…1: J F W Herschel's original drawing of the solar disk, with sunspots, as observed at the Cape of Good Hope on 25 May 1837, together with his enlarged drawing of a sunspot showing its striated penumbra (Herschel, 1847). His annotation reads "best glimpses striated appearance of penumbra".…”

Section: The Magnetic Geometry Of a Sunspotmentioning

confidence: 99%

The puzzling structure of a sunspot

Tobias

Weiss

2004

Astron Geophys

View full text Add to dashboard Cite

Why does a sunspot look the way it does? Steven Tobias and Nigel Weiss find answers to this question, by relating new high-resolution observations to recent theoretical studies of the spot's magnetic field.2: Sunspot observed with the highest attainable resolution. This remarkable image of the solar surface was obtained in the CH G-band at 4305 Å, using adaptive optics on the Swedish 1 m Solar Telescope on La Palma (Scharmer et al. 2002). This enlargement shows penumbral filaments in detail, as well as some fine structure in the umbra of the sunspot. The tick marks are at intervals of 1000 km. (Royal

show abstract

“…Measurements of the integral brightness of the lunar disk as a function of phase angle have been performed by many observers [e.g., [22][23][24][25]. In 1916, Russell [26] surveyed the data of previous observers, deduced mean values, and determined a phase-angle variation of integral brightness.…”

Section: The Lunar Photometric Functionmentioning

confidence: 99%

A survey of lunar geology, 10 January through 10 June, 1966

Cook¹

1967

Open-File Report

View full text Add to dashboard Cite

Principal Investigator. The work reported here is consonant with and fulfills part of the objectives of a comparative multispectral remote-sensing program of the Infrared and Optical Sensor Laboratory. The goal of the program is to develop methods of improving and extending current re mote-sensing capabilities by studying the spectral characteristics of surface features of objects being sought. Improvements are being sought in the kinds and quantities of data obtainable and in the quality, speed, and economy of the image-interpretation process.

show abstract

Corrigendum in the "Results of Astronomical Observations at the Cape of Good Hope." Appendix D. p. 449

Cited by 12 publications

References 0 publications

A revised historical light curve of Eta Carinae and the timing of close periastron encounters

A revised historical light curve of Eta Carinae and the timing of close periastron encounters

The puzzling structure of a sunspot

A survey of lunar geology, 10 January through 10 June, 1966

Contact Info

Product

Resources

About