- Space telescope
- NORAD 23715
- 1995-062A
- Highly elliptical orbit
Current orbit
View on live mapOrbit began over the Indian Ocean
Orbit ends over the Indian Ocean
Sunlit since
Enters the Earth’s shadow
In view from you
Nobody watches ISO 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 ISO, 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 far too faint for the naked eye, and catching it would take a telescope driven to follow a point crossing the sky in minutes. What is worth looking at is what it sends back.
Timeline
- Launch
Launched, on the day GCAT records. Source
Summary
Over the Pacific Ocean LIVE
Where is ISO?
At 4:41:00 PM UTC ISO was over the Pacific Ocean (0.4° N, 165.1° E), 25,784 km up, moving at 3.9 km/s and in sunlight.
What is ISO?
A space telescope in a highly elliptical orbit, in space since Nov 17, 1995.
Can I see ISO?
No, not with the naked eye: no brightness has been published for ISO, and nothing here estimates one; what people use is what it sees, which its operator publishes.
General
- Operator
- European Space Agency
- State
- European Space Agency
- Built by
- Aerospatiale-Cannes
- What it is
- Space telescope
- Launched
- Mass
- about 2.5 t
- Operating
- Orbit class
- Highly elliptical orbit
From GCAT, Jonathan McDowell’s general catalogue, licensed CC BY 4.0: the operator, the state, the manufacturer, what it is for, the launch day, the mass, and whether it is operating. The orbit class is read from its current elements.
Latest orbital data
- Position received
- 4:41 PM UTC
- Station time (UTC)
- 4:41 PM UTC
- Latitude / longitude
- 0.4° N, 165.1° E
- Altitude
- 25,784 km
- Speed
- 3.9 km/s (14,040 km/h)
- Course
- west
- Light
- In sunlight until 2:22 PM UTC
- Inclination
- 0.5°
- Orbital period
- 1,409 minutes
- Orbits per day
- 1.02
- This orbit
- 667 to 69,853 km
- In shadow
- 31 minutes of each orbit
- In view from
- Within 7,640 km of the point below it
- Elements epoch
- Nov 7, 2026, 3:27 PM, 1 day old
- Source
- Position from Space-Track orbital elements of Nov 7, 2026, 3:27 PM, 1 day old.
No operator publishes an ephemeris for ISO, so every position here comes from its orbital elements.
In orbit
- Close approaches
- No close approach to ISO 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
ISO shares its launch, 1995-062, with 2 other bodies the catalogue lists in orbit.
| Body | What it is |
|---|---|
| ARIANE 44P+3 R/B | Rocket body |
| ISO DEB | Debris |
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.
Beside the others
| Satellite | Typical altitude | Orbital period | Mass | In space since |
|---|---|---|---|---|
| ISO | 667 to 69,853 km | 1,409 minutes | about 2.5 t | 1995 |
| XMM-Newton | 29,443 to 91,682 km | 2,873 minutes | about 3.8 t | 1999 |
| Cheops | 679 to 694 km | 98 minutes | 280 kg | 2019 |
| Fermi | 488 to 498 km | 94 minutes | about 4.3 t | 2008 |
| Hubble | 465 to 480 km | 94 minutes | about 12.2 t | 1990 |
| Chandra | 12,186 to 136,630 km | 3,809 minutes | about 4.8 t | 1999 |
Data and API
The current elements from Space-Track as an OMM object, epoch Nov 7, 2026, 3:27 PM, 1 day old.
{
"OBJECT_NAME": "ISO",
"OBJECT_ID": "1995-062A",
"EPOCH": "2026-11-07T15:27:57.418848",
"MEAN_MOTION": 1.02203334,
"ECCENTRICITY": 0.83080232,
"INCLINATION": 0.5332,
"RA_OF_ASC_NODE": 69.6601,
"ARG_OF_PERICENTER": 257.4914,
"MEAN_ANOMALY": 2.1379,
"EPHEMERIS_TYPE": 0,
"CLASSIFICATION_TYPE": "U",
"NORAD_CAT_ID": 23715,
"ELEMENT_SET_NO": 999,
"REV_AT_EPOCH": 11516,
"BSTAR": -0.0039617272,
"MEAN_MOTION_DOT": -0.0000011,
"MEAN_MOTION_DDOT": 0
}