|
```python
from astropy import units as u
from astropy.coordinates import SkyCoord,
EarthLocation, Longitude, Latitude,
CIRS
# Define ICRS coordinates
source = SkyCoord(
'16h 29m 24.45970s', '−26d 25m 55.2094s',
d = u.AU / 5.89 * u.mas,
pmra = -12.11 * u.mas / u.yr,
pmdec = -23.30 * u.mas / u.yr,
rv = -3.4 * u.km / u.s)
# Observer location
loc = EarthLocation.from_geodetic(
Longitude(50.7374),
Latitude(7.0982),
height=60.0)
# Set time of observation
time = astropy.time.Time(
"2025-02-27T19:57:00.728+0200"
scale='tai')
# Observer frame & system
frame = CIRS(obstime=time, location=loc)
# apparent coordinates
app = source.transform_to(frame);
```
|
```c++
#include
using namespace supernovas;
// IERS Earth Orientation Parameters...
EOP eop(37, 62.56 * Unit::ms,
103.4 * Unit::mas, 396.2 * Unit::mas);
// Define ICRS coordinates
auto source = CatalogEntry("Antares",
"16h 29m 24.45970s", "−26d 25m 55.2094s")
.parallax(5.89 * Unit::mas)
.proper_motion(-12.11 * Unit::mas / Unit::yr,
-23.30 * Unit::mas / Unit::yr)
.radial_velocity(-3.4 * Unit::km / Unit::s)
.to_source();
// Observer location
auto obs = Site::from_GPS(50.7374, 7.0982, 60.0)
.to_observer(eop);
// Set time of observation
Time t("2026-03-14T13:43:00.728+0200", eop,
NOVAS_TAI);
// Observer frame
auto frame = obs.frame_at(t);
// apparent coordinates in system
auto app = source.apparent_in(frame).cirs();
```
</td>
</tr>
</table>
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Copyright (C) 2026 Attila Kovács
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