Tansei-3

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Link to this page

https://orbinauts.com/satellites/9841

  • TANSEI 3 (MS-T3)
  • NORAD 9841
  • 1977-012A
  • Medium Earth orbit

Current orbit

Where Tansei-3 is on the world map, with the orbit it is flying
View on live map

Orbit began over the Pacific Ocean

Orbit ends over the Pacific Ocean

Sunlit since

Enters the Earth’s shadow

Past trackNext orbits

In view from you

Nobody watches Tansei-3 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-3, 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

  1. Launch

    Launched, on the day GCAT records. Source

Summary

Over the Pacific Ocean LIVE

Where is Tansei-3?

At 7:26:22 PM UTC Tansei-3 was over the Pacific Ocean (27.6° S, 158.5° W), 811 km up, moving at 8.07 km/s and in sunlight.

What is Tansei-3?

A satellite in medium Earth orbit, in space since Feb 19, 1977.

Can I see Tansei-3?

No, not with the naked eye: no brightness has been published for Tansei-3, 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
128 kg
Operating
Orbit class
Medium 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
7:26 PM UTC
Station time (UTC)
7:26 PM UTC
Latitude / longitude
27.6° S, 158.5° W
Altitude
811 km
Speed
8.07 km/s (29,034 km/h)
Course
south-east
Light
In sunlight until 8:35 PM UTC
Inclination
65.8°
Orbital period
134.1 minutes
Orbits per day
10.74
This orbit
794 to 3,804 km
In shadow
13 minutes of each orbit
In view from
Within 2,130 km of the point below it
Elements epoch
Nov 8, 2026, 2:23 AM, 17 hours old
Source
Position from Space-Track orbital elements of Nov 8, 2026, 2:23 AM, 17 hours old.

No operator publishes an ephemeris for Tansei-3, so every position here comes from its orbital elements.

In orbit

Close approaches
No close approach to Tansei-3 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.

See every close approach reported in orbit.

Launched with

Tansei-3 shares its launch, 1977-012, with 6 other bodies the catalogue lists in orbit.

BodyWhat it is
TANSEI 3 DEBDebris
TANSEI 3 DEBDebris
TANSEI 3 DEBDebris
TANSEI 3 DEBDebris
TANSEI 3 DEBDebris
TANSEI 3 DEBDebris

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, 2:23 AM, 17 hours old.

{
  "OBJECT_NAME": "TANSEI 3 (MS-T3)",
  "OBJECT_ID": "1977-012A",
  "EPOCH": "2026-11-08T02:23:41.677152",
  "MEAN_MOTION": 10.73923309,
  "ECCENTRICITY": 0.17345604,
  "INCLINATION": 65.7608,
  "RA_OF_ASC_NODE": 348.5765,
  "ARG_OF_PERICENTER": 217.0379,
  "MEAN_ANOMALY": 129.7561,
  "EPHEMERIS_TYPE": 0,
  "CLASSIFICATION_TYPE": "U",
  "NORAD_CAT_ID": 9841,
  "ELEMENT_SET_NO": 999,
  "REV_AT_EPOCH": 94916,
  "BSTAR": 0.000068730635,
  "MEAN_MOTION_DOT": -1.3e-7,
  "MEAN_MOTION_DDOT": 0
}