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Birkeland

In orbit NORAD 55015 MXLF-5468-2040-9772-6013 Netherlands Norway

Observations 2
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2023

Launch

2

Observations all time

Mission information
Spacecraft name
Birkeland
Other names
Milspace2-1, ex BROS 1.
Website
https://www.nlr.org/news/norwegian-dutch-research-mission-for-radar-signals/
Status
Active
The satellite is in orbit
The network has not received data from this satellite for a long time
Launch and timeline
Launch time
2023-01-03 14:57:00
Separation time
Satellite appearance
Data for the last 30 days
Orbital parameters of the satellite
Perigee
432.48 km
Apogee
442.53 km
Inclination
97.3°
Period
93.4 min
Semi-major axis
6815.6 km
Velocity
7.65 km/s
Orbital elements
TLE source
Celestrak
TLE updated
2026-10-12 05:08:34 UTC
Two-line elements (TLE)
1 55015U 23001G   26284.96654059  .00011013  00000-0  26102-3 0  9998
2 55015  97.3232 353.3035 0007312  54.8179 305.3752 15.41893712210338
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Orbit history, past year

Mean elements of every TLE set over the past 365 days, plotted against the epoch of the set. Each source is its own line; click it in the legend to hide it. A jump in altitude is a manoeuvre or a bad set; lines drifting apart are a disagreement between sources. “TLE age” is how many hours have passed since the epoch of the source's freshest set, plotted against when the set reached us, on a logarithmic scale. A set the source repeats unchanged does not reset the age.

Prediction divergence

Each TLE set is propagated with SGP4 to the epoch of the next set from the same source and compared with it, plotted against the epoch of the next set; the tooltip shows how many hours ahead the prediction ran. The logarithmic scale shows the size of the divergence and the tooltip its sign: plus along-track means the prediction is ahead of the satellite. This is how well the sets agree, not the true error: the reference is a TLE too, off by about a kilometre. An outlier is a manoeuvre between sets. Sets more than a week apart are not compared.

Time of closest approach, UTC Object 1 Object 2 Distance, km Speed, km/s Max. probability
2026-10-13 01:29:14 BIRKELAND
NORAD 55015 		KUIPER-00032
NORAD 63745 		4.755 8.49 1.7e-07
2026-10-14 22:01:01 STARLINK-3716
NORAD 52092 		BIRKELAND
NORAD 55015 		4.429 14.77 2.8e-06
2026-10-14 22:22:28 BIRKELAND
NORAD 55015 		CZ-2C DEB
NORAD 43534 		4.707 13.93 1.0e-07
2026-10-15 17:54:40 LEMUR-2-AMANDA-SVANTE
NORAD 48269 		BIRKELAND
NORAD 55015 		3.951 1.81 2.8e-07
2026-10-15 19:28:07 LEMUR-2-AMANDA-SVANTE
NORAD 48269 		BIRKELAND
NORAD 55015 		4.493 1.81 2.2e-07
2026-10-15 23:21:45 LEMUR-2-AMANDA-SVANTE
NORAD 48269 		BIRKELAND
NORAD 55015 		4.824 1.81 1.9e-07
2026-10-16 00:55:12 LEMUR-2-AMANDA-SVANTE
NORAD 48269 		BIRKELAND
NORAD 55015 		1.911 1.81 1.2e-06
2026-10-17 08:51:28 BIRKELAND
NORAD 55015 		PELICAN-4
NORAD 65316 		3.975 0.80 2.8e-07
2026-10-17 09:38:14 BIRKELAND
NORAD 55015 		PELICAN-4
NORAD 65316 		4.294 0.80 2.4e-07
2026-10-17 15:24:58 STARLINK-2107
NORAD 47723 		BIRKELAND
NORAD 55015 		3.215 14.75 5.4e-06
2026-10-17 22:18:57 BIRKELAND
NORAD 55015 		STARLINK-30923
NORAD 58381 		4.832 7.54 5.1e-06
2026-10-17 23:02:03 BIRKELAND
NORAD 55015 		STARLINK-5315
NORAD 55309 		1.906 15.02 1.4e-05
2026-10-18 04:14:26 BIRKELAND
NORAD 55015 		STARLINK-5624
NORAD 55416 		1.419 13.14 3.9e-05

Data: CelesTrak SOCRATES Plus, computed from TLEs of the public catalog. This is an estimate, not grounds for a manoeuvre: TLEs carry no covariance, and the maximum probability assumes a position error.

All conjunctions of this satellite