The system has an orbital period of about 14 years.

The orbital period was estimated to be around 11 hours.

It would have an orbital period of roughly 1.8 million years.

A higher altitude would give him a longer orbital period.

This approach also led to the comet's orbital period to increase to 8.0 years.

At this distance, such a planet would have an orbital period of almost 324 days.

"The orbital period was already down to about a second at the source.

The system shows orbital period variation, likely due to the presence of a third body.

Its orbital period was found to be very high - initially estimated at over 1400 years.

A star's energy remains nearly constant for many orbital periods.

In 1937 it passed close to Jupiter which increased its orbital period slightly.

Because the orbital period was 106 minutes, the fragments would not decay quickly.

These binary systems usually have orbital periods of under 2.5 hours.

Orbital period is estimated 2.3 years, but planet has still to be confirmed.

Also orbital period turns out longer than 85 years.

The orbital period is estimated at 9.3 years, but no planet has been confirmed yet.

Kepler-9b's orbit grows, on average, four minutes longer every orbital period.

However, by 2009, only seven planets with orbital periods of up to five days had been discovered.

"If we knew that, then we'd know the planet's orbital period," said somebody else.

They have an orbital period of approximately 2.5 years.

By the end of this first apparition the orbital period was identified as 5.5 years.

Wouldn't it actually be spinning faster than the orbital period of its planets?

It has an orbital period of approximately 1970 days.

The secondary and tertiary stars have an orbital period of 260 years.

The orbital period of the system is accurately known.