It takes some imagination to see the object in many constellations

Weekly astronomy column from DRAO's Ken Tapping

  • Sep. 28, 2011 6:00 a.m.

There cannot be very many of us who have never spent summer evenings lying on the ground looking at the stars, especially when camping well away from town. When doing this, most of us would have also wondered how our ancestors managed, in those random scatterings of stars,  to see animals, heroes and mythical beasts.  These groupings of stars are called constellations. One thing almost all constellations have in common is they don’t look much like what they are supposed to represent. Aries looks nothing like a ram, Aquila nothing like an eagle, and Auriga, with its bright star Capella which is in the north east late these evenings, looks nothing like a charioteer. Actually there is a constellation high in the east these evenings that looks exactly as its name says it should; three faintish stars form a triangle, and the constellation is named Triangulum – The Triangle. Moreover, The “Big Dipper” does look like a pot with a handle, and in England is often referred to as “The Saucepan”. It is also called “The Plough”, because a little imagination makes it resemble the agricultural instrument. It also looks a bit like a wagon, without wheels or horses, and is called “Charles’ Wain” – Charles’ Wagon. However, this clustering of stars is not a constellation, it is only part of one. The constellation containing the stars of the Dipper is Ursa Major – “The Great Bear”.

If you look carefully at all the bright and faint stars in the constellation, it does look something like a large quadruped, with a long snout, but not much like a bear. In particular, no bear has a tail that long. Its neighbour, Ursa Minor, the “Little Bear”, with Polaris “The North Star”, or “Pole Star” at the end of its tail, also has a ridiculously long tail. It has been suggested that the bears have long tails because that’s how they were pulled up into the heavens

An additional thing about constellations is that they only look as they do from our viewing point. Stars looking close in the sky may actually be at very different distances from us. Imagine looking at the lights of a town at night from a point on a nearby hill. You can connect the lights, making “constellations.” However, if you move to another hill and look again, all your constellations will have gone, or changed into different patterns.

We have a nice demonstration in the library at our observatory. The constellation of Orion, “The Hunter,” has been set up using balls hanging on strings, arranged as they really are, with the stars at differing distances. If you look from the position of the little ball representing the Earth, you see the familiar shape of Orion, which is one of the few constellations that looks something like what it represents. However, shift your point of view and Orion vanishes; we just see an unfamiliar arrangement of stars. It’s interesting how we can use the constellations to navigate our ships, and to navigate spacecraft around the Solar System. However, it won’t work for interstellar travellers. Imagine what the big dipper might look like from the side. Imagine looking at the sky of some planet orbiting another star and seeing an exotic constellation, where one of its member stars is the Sun.

Jupiter rises around 9 p.m., Mars comes up around 2 a.m. The Moon will reach first quarter on the 3rd.

Ken Tapping is an astronomer with the National Research Council’s Herzberg Institute of Astrophysics, and is based at the Dominion Radio Astrophysical Observatory, Penticton.


Just Posted

Chance of showers and thunderstorm for Okanagan-Shuswap-Similkameen

Mostly cloudy day for the Okanagan-Shuswap and Similkameen regions

“Our community has had its heart broken”: Penticton celebrates life of David Kampe

Community and families members who knew Kampe give tearful addresses

B.C. Premier Horgan to make announcement in Keremeos

B.C. Premier John Horgan is scheduled to make an announcement in Keremeos

Okanagan-Shuswap weather: Unsettled skies dominate the week’s forecast

A chance of thunderstorms is in the forecast for much of the Okanagan-Shuswap.

Similkameen Secondary School valedictorians talk high school experience

“If you want something to happen, you have to work hard,” says 2019 valedictorian

VIDEO: Weekday weather update for the Okanagan Valley

Prepare for a rainy week with a chance of thunderstorms

Canadian communities responding to climate change

New research highlights state of local adaptation planning in Canada

Victoria woman in L.A. hospital after she was run over twice

Lynn Phillips has suffered from multiple broken bones and internal bleeding

‘Text neck’ causing bone spurs to grow from millennials’ skulls, researchers say

Technology use from early childhood causing abnormal bone growths in 41 per cent of young adults

B.C. judge defies lawyers and adds six months to man’s sex assault sentence

‘I find the joint submission is contrary to the public interest and I’m rejecting it’

Tiny Yorkshire terrier survives days on remote B.C. island

ROAM rescue crews, family searched for dog, missing in Greater Victoria for days

Pelmewash Parkway opening is the latest milestone in First Nations-government relations

Lake Country officially opens the Pelmewash Parkway with a ceremonial ribbon cutting

Crash near Okanagan elementary school investigated

RCMP officer watches driver hit concrete barrier and then fence at school

Trans event at Pride gives marginalized youth a community, says director

The Trans Youth March and Social participants rallied on Thursday, June 20.

Most Read