- TANSEI 1 (MS-T1)
- NORAD 4952
- 1971-011A
- Low Earth orbit
Current orbit
View on live mapOrbit began over Nepal
Orbit ends over Iran
In the Earth’s shadow since
Back in sunlight
In view from you
Nobody watches Tansei-1 go over, but a receiver still asks whether it is above the horizon. Say where you are and this card answers.
Your position is rounded to about a kilometre and sent only to the Orbinauts API, to find the pass.
No brightness has been published for Tansei-1, so it is not a naked-eye satellite and no city page carries pass times for it. Nothing here estimates one.
Seeing it
There is nothing to go outside for: it is too faint to see with the naked eye from anywhere on Earth.
Timeline
- Launch
Launched, on the day GCAT records. Source
Summary
Over Saudi Arabia LIVE
Where is Tansei-1?
At 7:36:56 PM UTC Tansei-1 was over Saudi Arabia (27.8° N, 47.7° E), 981 km up, moving at 7.4 km/s and in the Earth’s shadow.
What is Tansei-1?
A satellite in low Earth orbit, in space since Feb 16, 1971.
Can I see Tansei-1?
No, not with the naked eye: no brightness has been published for Tansei-1, and nothing here estimates one.
General
- Operator
- Institute of Space and Aeronautical Sci
- State
- Japan (Nippon), State of
- Built by
- Institute of Space and Aeronautical Sci
- Launched
- Mass
- 63 kg
- Operating
- No: its regular operations have ended
- Orbit class
- Low Earth orbit
From GCAT, Jonathan McDowell’s general catalogue, licensed CC BY 4.0: the operator, the state, the manufacturer, the launch day, the mass, and whether it is operating. The orbit class is read from its current elements.
Latest orbital data
- Position received
- 7:36 PM UTC
- Station time (UTC)
- 7:36 PM UTC
- Latitude / longitude
- 27.8° N, 47.7° E
- Altitude
- 981 km
- Speed
- 7.4 km/s (26,622 km/h)
- Course
- east
- Light
- In the Earth’s shadow until 7:57 PM UTC
- Inclination
- 29.7°
- Orbital period
- 106 minutes
- Orbits per day
- 13.59
- This orbit
- 985 to 1,104 km
- In shadow
- 34 minutes of each orbit
- In view from
- Within 2,380 km of the point below it
- Elements epoch
- Nov 8, 2026, 7:26 AM, 12 hours old
- Source
- Position from Space-Track orbital elements of Nov 8, 2026, 7:26 AM, 12 hours old.
No operator publishes an ephemeris for Tansei-1, so every position here comes from its orbital elements.
In orbit
- Close approaches
- No close approach to Tansei-1 has been reported publicly in the past thirty days.
From Space-Track’s public conjunction messages; the latest report was issued Nov 8, 2026, 1:11 PM, 3 hours old. Only approaches serious enough to be reported publicly are listed: within three days and, for two bodies near the Earth, closer than a kilometre with a chance of a collision above 1 in 10,000, the level at which NASA moves the ISS.
Launched with
Tansei-1 shares its launch, 1971-011, with one other body the catalogue lists in orbit.
| Body | What it is |
|---|---|
| M-4S R/B | Rocket body |
Read from the international designators of the US catalogue: the year and the launch number every piece of one launch shares. A body that has come down is no longer listed.
Data and API
The current elements from Space-Track as an OMM object, epoch Nov 8, 2026, 7:26 AM, 12 hours old.
{
"OBJECT_NAME": "TANSEI 1 (MS-T1)",
"OBJECT_ID": "1971-011A",
"EPOCH": "2026-11-08T07:26:43.423584",
"MEAN_MOTION": 13.58644818,
"ECCENTRICITY": 0.00796685,
"INCLINATION": 29.6679,
"RA_OF_ASC_NODE": 325.562,
"ARG_OF_PERICENTER": 74.3699,
"MEAN_ANOMALY": 31.066,
"EPHEMERIS_TYPE": 0,
"CLASSIFICATION_TYPE": "U",
"NORAD_CAT_ID": 4952,
"ELEMENT_SET_NO": 999,
"REV_AT_EPOCH": 76814,
"BSTAR": 0.000055523616,
"MEAN_MOTION_DOT": 0.00000106,
"MEAN_MOTION_DDOT": 0
}