HALLEY’S COMET

Photograph taken on May 4, 1910, by Professor E. E. Barnard at the

Yerkes Observatory, Williams Bay, Wisconsin

]

Then came May 4, a bitterly cold morning; but the stars shone brightly

and there was every hope of the comet being visible from the tower

heights. These hopes were confirmed, for on stepping out on to the

parapet the writer saw the comet in all its splendor. The hazy-looking

object seen on September 17, 1909, had developed into a full-grown comet

with a head shining as a star of about the second magnitude, and

surrounded by a nucleus. Extending outward like the beam of a

searchlight gleamed the tail nearly fifteen degrees in length. Calling

down to the janitor to make known the good news, the balcony was soon

filled with eager members of the _Times_ staff, who were thus enabled to

obtain a view of the comet. By means of a field-glass thoughtfully

provided by Mr. Van Anda, it was possible to see a further extension of

the train, making it in all thirty degrees in length. Spurts of light

like tiny waves seemed to flow out from the nucleus to a distance of two

or three degrees. At twenty minutes to four, the writer, on looking

downward at the horizon, was startled by what appeared to be a streak of

flame, but as it rose higher it proved to be the crescent moon, which

with the comet and the planet Venus, completed a wonderful trio. The

comet remained visible, resembling a bright star with a slender stream

of silvery mist trailing a few degrees after. By four o’clock it had

faded in the light of approaching dawn. A glance at the photograph of

Halley’s comet obtained by Professor Barnard at the Yerkes Observatory

on May 4 will give an idea of its splendor.

For the next few mornings observations of the comet were disappointing,

owing to heavy mists in the eastern skies. The comet was almost

completely hidden from view, except on the morning of May 8, when

occasional glimpses were obtained of it through rifts in the clouds. On

May 10, the nucleus of the comet, from which extended a diminutive train

eight degrees in length and fan-like in appearance, could be seen for a

few brief moments, after which it remained hidden behind clouds until

dawn, making further observations impossible.

It was not until the morning of Friday, May 13, that the comet once more

deigned to reveal itself to the straining eyes of the lonely watcher on

the tower. The first glimpse was obtained at ten minutes past three. The

comet then resembled a faint white streak drifting in the sky. A minute

or so later the planet Venus came into view, gaining in brilliancy as it

rose above the mists near the horizon. At twenty-five minutes past three

the train of the comet was twenty degrees in length, and by half past

three it extended to a distance of thirty-five degrees, or seven times

the distance between the pointers (Alpha and Beta in Ursa Major). It

spread out like a partly opened fan, its greatest width at the extreme

end being about five degrees or more. The nucleus shone brightly as a

star of the second magnitude, but by half past three it began to grow

less distinct, and at twenty minutes past four the comet had faded from

view on the arrival of the first few streaks of dawn.

The comet was barely visible the next few mornings, though watched for

anxiously, since there was always the possibility that it might reveal

itself, but these hopes were not realized. A glance at the cloudy skies

on the morning of May 18 suggested the impossibility of seeing the

comet, and for the first time since the morning of May 1, the writer

missed her vigil at the tower.

Interest was revived, however, on learning that Professor Barnard had

seen that morning

“a narrow twilight (which later proved to be the tail of the comet)

which seemed to extend along the eastern horizon.... The head of the

comet could not be seen when it rose, with either the five-inch or

the forty-inch telescope, because of the thick sky near the

horizon.... The observations show that the tail was at least 109°

long on that date. (_Astrophysical Journal_, vol. XXXIX, no 5, pp.

387–388, June, 1914.)

Now despite the fact that an astronomer at Columbia University had

declared the comet would be in the evening sky, and it was useless

looking for it in the morning sky of May 19, the writer decided,

nevertheless, to watch for the comet at about the usual hour, and with

the most gratifying results.

The parapet surrounding the tower was crowded to its utmost capacity by

a favored few on the eventful evening of May 18, awaiting they knew not

what, for a report had gone forth that we were scheduled to pass through

the train of the comet. Below us we could see comet parties in progress

on the roof gardens of some of the leading hotels. Sounds of merriment

occasionally reached us, but by half past ten we—that is, Miss L., who

had offered to share the lonely vigil with the writer until dawn—were

the only watchers on the tower. The hush of a great silence had

gradually fallen over the city, and in silence, too, we watched the

eastern sky for any further trace of the comet.

Notes made by the writer on this occasion record 11.10, red flash

(auroral); 11.22, flash resembling an arch of glowing white surmounted

by a crest of crimson. The display occurred above a low-lying bank of

mist and rose to about five degrees above the horizon. It was not of any

considerable breadth, and resembled rather a glow of color against the

dark background of the sky than a wide band of light. The moon, which

was shining brightly, interfered seriously with the observations of

auroral displays which appeared faint in its light. About 12.15 a mist

appeared to spread over the city, and the air had become damp and

chilly. By 1.30 the mist had cleared away. At 2 o’clock a meteor flashed

across the eastern sky, downward in the direction of the star Gamma in

the constellation Pegasus. It was bluish-green in color, pear-shaped in

appearance, leaving a streak five degrees in length behind it as it

flashed to within ten degrees above the horizon. It remained visible for

about five seconds, and the display was vivid while it lasted. At 2.30

the moon, low down in the western sky, appeared of a ruddy hue as it

“sank in a sea of gloom.”

Turning eastward, we saw a soft glow in the sky spreading from below

Pegasus and upward as far as the stars of Cassiopeia. At 2.34 a glow of

grayish hue extended over the northeastern sky. At 2.43 a bright meteor

was seen by Miss L., but she made no note of its direction, except that

it was eastward, and a brief glimpse obtained by the writer showed its

color as bluish.

At 2.45 streamers, which later proved to be the comet, were observed

reaching from the eastern horizon, below Gamma Pegasi, and curving

upward through Aquarius as far as Altair, and brighter in appearance

than the Milky Way. At its widest part, just beneath the first-magnitude

star Altair, the width of the band was about ten degrees, and throughout

its length it had a brilliancy equal to that of the Milky Way, near

which it terminated. The path of this band of light was very nearly that

along which the comet was last seen, and the writer was convinced that

it was the outer boundary of the tail through which the earth was

passing. Beneath this streamer, and apparently resting along the

southeastern horizon, was a secondary band resembling a haze-like misty

streamer. This was not as clearly defined as was the upper band, and,

moreover, it merged into the mists of the horizon.

In connection with a sketch made by the writer on this occasion, and

shown to Professor Barnard, he referred to it as follows in his account

of “Visual Observations of Halley’s Comet in 1910,” published in the

_Astrophysical Journal_ for June, 1914:

“With the exception of a sketch by Miss Mary Proctor in New York

City, and a newspaper account by Professor D. P. Todd of Amherst

(whose observation seemed to refer to May 16th), I have seen no

reference from northern observers to the second, fainter and broader

tail shown in my drawings of May 17 and 18, south of the bright beam

and separated from it by a distinct dark space, perhaps ten degrees

wide. The head of the comet was of course invisible, being below the

horizon.”

This was all the more pleasing to the writer, as doubts had been

expressed in no uncertain terms by a well-known authority, according to

the following statement published in an afternoon paper. “Some one

thinks she saw the comet in the eastern sky, when it is really in the

west.” One can imagine the anxious time experienced while awaiting

confirmation of the observation, but it came in due course from Yerkes,

Lick, Argentine Republic, South Africa, and the writer felt rewarded for

the many dreary waits in the tower during the “wee sma’ hours” since May

1.

On the morning of May 20, the writer again watched from the _Times_

tower, in the hope of seeing some straggling streamers trailing along

the sky, denoting the presence of the comet. Between half past two and a

quarter past three a ghostly apparition resembling a slender band of

light was seen extending upward, though almost parallel with the

northeastern horizon. It seemed to rest on a darker band of luminous

haze beneath. Surely this was the last fragment of the train of the

comet, outlined faintly against the dark void of space.

That same morning Professor Barnard at Yerkes detected a hazy luminous

streak about five degrees broad extending from Aquilæ to the east and

onward toward Alpha Pegasi. “This resembled the comet’s tail,” recorded

Professor Barnard,

“but was doubtless a strip of haze. I looked at it several times,

taking it for a strip of haze, but it did not seem to move. There

were masses of moving haze overhead toward the north. To all

appearance it looked like the comet’s tail of the mornings of May 18

and 19. I cannot be certain that it was not haze, but it was a

singular coincidence of position, appearance, etc., if it was. It

remained visible for fully fifteen or twenty minutes.”

[Illustration:

The romance of comets · 第 14 / 21 题