Circular Orbit Time Period Calculator
The circular orbital period also know as the revolution period is the time taken by an object to complete one orbit around a celestial body. The orbit is a regular, repeating path and refers to the time it takes for a celestial body to orbit around its star, such as the Moon's orbit around the Earth or the time it takes for the Earth to orbit the Sun.
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The orbital period for a circular orbit is calculated from Kepler’s third law (law of periods) which states that the square of the time period of any satellite is proportional to the cube of the semi-major axis of its elliptical orbit. Here for orbital period calculation, we assume a circular orbit with radius ‘r’.
The orbital radius can be calculated for different orbits such as
- Low-Earth Orbit – Altitude from Earth's surface 200-2000 Km
- Medium-Earth Orbit – Altitude from Earth's surface 2000 Km to 35,786 Km
GNSS Constellations - A list of all GNSS satellites by constellations
beidou
| Satellite Name | Orbit | Date |
|---|
| BeiDou-3 G4 | Geostationary Orbit (GEO) | 17 May, 2023 |
| BeiDou-3 G2 | Geostationary Orbit (GEO) | 09 Mar, 2020 |
| Compass-IGSO7 | Inclined Geosynchronous Orbit (IGSO) | 09 Feb, 2020 |
| BeiDou-3 M19 | Medium Earth Orbit (MEO) | 16 Dec, 2019 |
| BeiDou-3 M20 | Medium Earth Orbit (MEO) | 16 Dec, 2019 |
| BeiDou-3 M21 | Medium Earth Orbit (MEO) | 23 Nov, 2019 |
| BeiDou-3 M22 | Medium Earth Orbit (MEO) | 23 Nov, 2019 |
| BeiDou-3 I3 | Inclined Geosynchronous Orbit (IGSO) | 04 Nov, 2019 |
| BeiDou-3 M23 | Medium Earth Orbit (MEO) | 22 Sep, 2019 |
| BeiDou-3 M24 | Medium Earth Orbit (MEO) | 22 Sep, 2019 |
galileo
| Satellite Name | Orbit | Date |
|---|
| GSAT0223 | MEO - Near-Circular | 05 Dec, 2021 |
| GSAT0224 | MEO - Near-Circular | 05 Dec, 2021 |
| GSAT0219 | MEO - Near-Circular | 25 Jul, 2018 |
| GSAT0220 | MEO - Near-Circular | 25 Jul, 2018 |
| GSAT0221 | MEO - Near-Circular | 25 Jul, 2018 |
| GSAT0222 | MEO - Near-Circular | 25 Jul, 2018 |
| GSAT0215 | MEO - Near-Circular | 12 Dec, 2017 |
| GSAT0216 | MEO - Near-Circular | 12 Dec, 2017 |
| GSAT0217 | MEO - Near-Circular | 12 Dec, 2017 |
| GSAT0218 | MEO - Near-Circular | 12 Dec, 2017 |
glonass
| Satellite Name | Orbit | Date |
|---|
| Kosmos 2569 | -- | 07 Aug, 2023 |
| Kosmos 2564 | -- | 28 Nov, 2022 |
| Kosmos 2559 | -- | 10 Oct, 2022 |
| Kosmos 2557 | -- | 07 Jul, 2022 |
| Kosmos 2547 | -- | 25 Oct, 2020 |
| Kosmos 2545 | -- | 16 Mar, 2020 |
| Kosmos 2544 | -- | 11 Dec, 2019 |
| Kosmos 2534 | -- | 27 May, 2019 |
| Kosmos 2529 | -- | 03 Nov, 2018 |
| Kosmos 2527 | -- | 16 Jun, 2018 |
gps
| Satellite Name | Orbit | Date |
|---|
| Navstar 82 | Medium Earth Orbit | 19 Jan, 2023 |
| Navstar 81 | Medium Earth Orbit | 17 Jun, 2021 |
| Navstar 78 | Medium Earth Orbit | 22 Aug, 2019 |
| Navstar 77 | Medium Earth Orbit | 23 Dec, 2018 |
| Navstar 76 | Medium Earth Orbit | 05 Feb, 2016 |
| Navstar 75 | Medium Earth Orbit | 31 Oct, 2015 |
| Navstar 74 | Medium Earth Orbit | 15 Jul, 2015 |
| Navstar 73 | Medium Earth Orbit | 25 Mar, 2015 |
| Navstar 72 | Medium Earth Orbit | 29 Oct, 2014 |
| Navstar 71 | Medium Earth Orbit | 02 Aug, 2014 |
irnss
| Satellite Name | Orbit | Date |
|---|
| NVS-01 | Geostationary Orbit (GEO) | 29 May, 2023 |
| IRNSS-1I | Inclined Geosynchronous Orbit (IGSO) | 12 Apr, 2018 |
| IRNSS-1H | Sub Geosynchronous Transfer Orbit (Sub-GTO) | 31 Aug, 2017 |
| IRNSS-1G | Geostationary Orbit (GEO) | 28 Apr, 2016 |
| IRNSS-1F | Geostationary Orbit (GEO) | 10 Mar, 2016 |
| IRNSS-1E | Geosynchronous Orbit (IGSO) | 20 Jan, 2016 |
| IRNSS-1D | Inclined Geosynchronous Orbit (IGSO) | 28 Mar, 2015 |
| IRNSS-1C | Geostationary Orbit (GEO) | 16 Oct, 2014 |
| IRNSS-1B | Inclined Geosynchronous Orbit (IGSO) | 04 Apr, 2014 |
| IRNSS-1A | Inclined Geosynchronous Orbit (IGSO) | 01 Jul, 2013 |
