## What is the diameter of Phobos?

14.002 miPhobos / Diameter

Phobos, gouged and nearly shattered by a giant impact crater and beaten by thousands of meteorite impacts, is on a collision course with Mars. Phobos is the larger of Mars’ two moons and is 17 x 14 x 11 miles (27 by 22 by 18 kilometers) in diameter.

## What is the angular diameter of Phobos as seen from Mars?

As seen from Mars, Phobos has an angular diameter of between 8′ (rising) and 12′ (overhead), while Deimos has an angular diameter of about 2′. The Sun’s angular diameter, by contrast, is about 21′.

**What is the radius of the orbit between Mars and Phobos?**

9.377 × 106 m

Phobos has mass 1.07 × 1016 kg; it orbits Mars once every 27,550 seconds following an orbit with radius 9.377 × 106 m.

**What is the diameter of Mars?**

4,212.3 miMars / Diameter

### How do you find the angular diameter?

Angular Diameter = 206265 X (Actual diameter / Distance) The 206,265 is a conversion factor to make sure the angular diameter comes out in seconds of arc.

### How do you find the angular diameter of the moon?

For instance, the Moon is located r = 384,000 km from Earth and it has a radius of d = 1,738 km, so its angular radius is 1,738/384,000 = 0.0045 radians. Since 1 radian = 57.3 degrees, the angular radius of the Moon is 0.0045 x 57.3 = 0.26 degrees, so its diameter is 0.52 degrees as viewed from Earth.

**How do you calculate the radius of the moon’s orbit?**

Kepler’s Third law can be used to determine the orbital radius of the planet if the mass of the orbiting star is known (R3=T2−Mstar/Msun, the radius is in AU and the period is in earth years).

**How do you calculate the radius of the Moon’s orbit?**

#### What is the diameter of Mars compared to Earth?

2001 Mars Odyssey

EARTH | MARS | |
---|---|---|

Diameter | 7,926 miles | 4,220 miles |

Tilt of Axis | 23.5 degrees | 25 degrees |

Length of Year | 365.25 Days | 687 Earth Days |

Length of Day | 23 hours 56 minutes | 24 hours 37 minutes |

#### How big is the moon compared to Mars?

Diameter of Mars 6792 kilometers. Mercury 4879 Kilometers and Moon 3748 kilometers.

**How big are Phobos and Deimos compared to Mars?**

Both are tiny — the larger, Phobos, is only 14 miles across (22 kilometers), while the smaller, Deimos, is only 8 miles (13 km), making them some of the smallest moons in the solar system.

**How do you find the angular diameter of the Moon?**

## What is angular diameter moon?

about 31 arcmin

The angle covered by the diameter of the full moon is about 31 arcmin or 1/2°, so astronomers would say the Moon’s angular diameter is 31 arcmin, or the Moon subtends an angle of 31 arcmin.

## How do you calculate angular diameter?

**How is angular size calculated?**

Angular Size in Astronomy is measured in arcminutes and arcseconds, which are used to represent angles on a sphere. An arcsecond is 1/3600th of one degree, and a radian is 180/π degrees, so one radian equals 3,600*180/π arcseconds, which is about 206,265 arcseconds.

**What is the size of the moon Phobos?**

Overview. Phobos is the larger of Mars’ two moons and is 17 x 14 x 11 miles (27 by 22 by 18 kilometers) in diameter. It orbits Mars three times a day, and is so close to the planet’s surface that in some locations on Mars it cannot always be seen.

### What does Mars look like from Phobos?

Orbital characteristics. As seen from Phobos, Mars would appear 6,400 times larger and 2,500 times brighter than the full Moon appears from Earth, taking up a quarter of the width of a celestial hemisphere. The Mars–Phobos Lagrangian L1 is 2.5 kilometers (1.6 mi) above Stickney, which is unusually close to the surface.

### How far above the Martian surface does the moon Phobos orbit?

The Martian moon Phobos orbits only a few thousand miles above the Red Planet’s surface. Its proximity to its planet is one of the reasons astronomers were unable to see the satellite until the late 19th century.

**How did the grooves on Mars’ moon Phobos form?**

N ew modeling indicates that the grooves on Mars’ moon Phobos could be produced by tidal forces – the mutual gravitational pull of the planet and the moon. Initially, scientists had thought the grooves were created by the massive impact that made Stickney crater (lower right). Image Credit: NASA/JPL-Caltech/University of Arizona