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47 Ursae Majoris
Chalawan
Yellow Dwarf Star with Planets
| Right Ascension | 10h 59m 29s | Best Seen | 3/1 - 7/1 |
| Declination | 40° 25' 46" | Magnitude | 5.1 |
| Constellation | Ursa Major | ||
Actual |
Compared to Sun |
|
| Distance | ~45 ly | -- |
| Actual Brightness | -- | -- |
| Surface Temperature | ~10,300 °F | ~1.03 |
| Diameter (average) | -- | -- |
| Mass | -- | ~ 1 |
| Surface Gravity | -- | -- |
| Surface Composition (by mass) | 74% hydrogen 24% helium 2% everything else |
same |
| Spectral Type | G0 V | G2 V |
| Density (gram/cubic cm) | -- | -- |
What To Look For Through The Telescope
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Recommended eyepiece: 24mm or 40 mm.
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When people look through the telescope a white point of light should be seen.
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Please note: the planet cannot be seen through any telescope.
47 Ursae Majoris Information:
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There are actually three planets orbiting this star.
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The first planet, 47 Ursae Majoris b, was discovered in 1996 by a team of astronomers led by Paul Butler and Geoff Marcy.
a. Planet b is just over 2 AU from its star.
b. This planet takes about 1090 days to complete an orbit.
c. The planet is about 2.5 times as massive as Jupiter.
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The second planet, 47 Ursae Majoris c, was discovered in 2001.
The same team, joined by Debra Fischer, discovered planet c.a. Planet c is about 3.7 AU from its star.
b. This planet takes nearly 2600 days to complete an orbit.
c. The planet is about 0.76 times as massive as Jupiter.
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A third planet, 47 Ursae Majoris was discovered in 2010 announced by Debra Fisher and P.C. Gregory.
a. Using the Bayesian Kepler Periodogram model of planetary systems, it was found that it is 100,000 times more likely to have three planets than two planets so they looked for a third after finding c.
b. The planet 11.6 AU from its star (1.078 billion miles).
c. Planet d takes 14,002 days (38.33 years) to complete an orbit.
d. The planet is about 1.64 times as massive as Jupiter.
e. It is the longest-period planet discovered by using the radial velocity method
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References
| Item | Updated | Notes |
| Coordinates 05-03-2003 planetquest.jpl.nasa.gov and SIMBAD | ||
| Magnitude 05-03-2003 planetquest, SIMBAD, and Geoff Marcy’s site exoplanets.org | ||
| Distance 05-03-2003 planetquest, SIMBAD, and exoplanets | ||
| Actual Brightness | ||
| Surface Temperature 05-03-2003 from spectral type, and type/temp chart from The Flamsteed Collection | ||
| Diameter -- | ||
| Mass 05-03-2003 from exoplanets.org | ||
| Surface Gravity -- | ||
| Surface Composition 05-03-2003 OK for all stars | ||
| Spectral Type 05-03-2003 OK with SIMBAD, exoplanets.org | ||
| Density -- | ||
| Other Information 05-03-2003 from planetquest and exoplanets.org | ||
| Third Planet (d) 03-24-2011 from Wikipedia.org |