Star Distance Calculator
The parallax angle is the angle between the Earth at one time of year, and the Earth six months later, as measured from a nearby star. Astronomers use this angle to find the distance from the Earth to that star. A second of arc, arcsecond (arcsec), or arc second, denoted by the symbol ?, is 1/60 of an arcminute and 1/3600 of a degree.
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- Dstar is the Star Distance (parsecs)
- P is the parallax angle (arc-seconds)
1 parsec is roughly equal to 3.086 x 1016 m. A parsec is the unit for expressing distances to stars and galaxies, used by professional astronomers. It represents the distance at which the radius of Earth's orbit subtends an angle of one second of arc.
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 |
