Get Ready for Stargazing in October, the Clearest Month
Get Ready for Stargazing in October, the Clearest Month
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In what month is the clearest of the year? study of the stars? The clearest time for the Pacific Northwest is around July; for the Midwest, August; for the Great Plains, it seems that it goes from July to October. But the most striking pattern is in the great region from New England, south and west to the Gulf states and Texas, where long-term weather records show that October is by far the clearest month of the year.
In the city of New York, for example, October usually has 12 days clear, more than in any other month in that location. The orientals can thank high pressure systems, that migrate from the west and tend to stop and spread during the month of October in the vicinity of West Virginia.
In addition to the clarity of the sky, the lack of fog leads to transparent views. This allows us to glimpse those weak stars near the threshold of visibility at a glance that can make the October nights so impressive. The strong, cold fronts that fall periodically into southern Canada often clean the atmosphere, with rainy rains traveling in front of them and fresh, dry and clean air behind them, providing a few days of excellent transparency. In fact, in contrast to the cloudy skies of late summer, we now give away days when the sky appears richer or deeper in blue and nights with some of the best observations of the year.
The[[The best events of the night sky of October 2018 (star observation maps)]
Enjoy the views of both summer and winter.
In addition, the ambient night air temperatures are comfortable. Yes, some nights can be a little cold, but just think a month or two before and imagine trying to observe in freezing or sub-freezing conditions.
In addition, October offers you the best of the summer and winter skies.
Right after sunset, we still have an excellent view of the summer milky way It extends from almost the head, towards the southwest horizon. With binoculars, we can sweep through the fields of bright stars in Cygnus, the swan, to the clouds of dazzling stars around the center of our galaxy in Sagittarius, the archer.
And if you get up before dawn, you can enjoy a preview of the sky in the middle of winter, with Orion, the hunter and his brilliant retinue of Taurus, the bull; Gemini, the twins; and flashes like white blue Sirius, the brightest of all the stars, and yellow-white. Capella, shining from a point almost directly above. Take a look at the beautiful Pleiades and Hyades star clusters with binoculars, or look at what many think is the sky's masterpiece, the Great Orion Nebula, a vast gas nebula that is often described in the observation guides of stars as one of the most wonderful telescopic objects in the heavens.
If this is not a sufficient incentive for you to dust off your telescope and go out to observe the stars, you only need to see what happens once we make the transition from October to November.
No wonder - November-November!
The 19th century English poet, Thomas Hood, wrote a poem that, I believe, best summarizes in November:
No sun, no moon!
Not tomorrow not noon
No dawn, no sunset, no appropriate time of the day.
Without heat, without joy, without healthy facility,
Do not feel comfortable in any member -
No shadow, no shine, no butterflies, no bees,
Without fruits, without flowers, without leaves, without birds! -
November!
And when it comes to stargazing ... well, as you can imagine from Hood's words, the general conditions deteriorate rapidly. The statistics clearly show that clear sky coverage in much of North America quickly takes a turn for the worse. In fact, once we entered November, we entered a prolonged period of widespread cloud cover.
According to the local climatological data of the National Oceanic and Atmospheric Administration of the United States, the most cloudy month falls between November and May for 98 percent of the meteorological stations sampled.
In other words, from November to April, approximately 25 to 35 percent of the United States sees more than 70 percent of cloud coverage in several months. In contrast, in October, only small portions of Maine and the Pacific Northwest endure such conditions.
The inconveniences of October
As a final note, however, I must point out that in some years, even October can be cruel to stargazers.
Unfortunately, those same "good weather" high-pressure cells that predominate during the early autumn in the East can sometimes work against sky watchers. These fronts also tend to produce light winds that, combined with the decreasing level of solar radiation reaching the Earth, sometimes create what is known as a "temperature inversion". At those times, a layer of hot and stagnant air puts an effective lid on the lower layers of the atmosphere, preventing the pollutants produced by man from venting upwards in the usual way.
This results in a layer of smog that thickens during the night and early morning hours. Just that October weather pattern occurred 53 years ago, unfortunately excluding pre-dawn views for most observers east of the Mississippi when the spectacular Ikeya-Seki Comet appeared. Ironically, this was the brightest comet of the twentieth century.
Joe Rao is an instructor and guest professor at the Hayden Planetarium in New York. He writes about astronomy for the Natural History magazine, the Farmers' Almanac and other publications, and is also an on-camera meteorologist for Verizon FiOS1 News in the Lower Hudson Valley of New York. Follow us on Twitter @Spacedotcom and in Facebook. Original article about Space.com.
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