MOS 1B (MOMO 1B)

Satellite information

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Satellite Type and Status

PAYLOADIN ORBIT

Key statistics

Satellite MOS 1B (MOMO 1B) at a glance.

Uptime

13093

Days in orbit

Revolutions

≈ 14.0

Per day

Orbit

SSO

Sun Synchronous Orbit

Inclination

99.2

Latest

Satellite identification and parameters

Extended collection of information and parameters for MOS 1B (MOMO 1B).

Object identification

Identified? True

Debris? False

Object name: MOS 1B (MOMO 1B)

International designator: 1990-013A

Object number (NORAD): 20478

Object ID (CCSDS): 20478

Country: JAPAN (JPN)

Current information (Y/N): Y

RCS size: LARGE

Orbital parameters

Period: 103.15 minutes

Inclination: 99.2474 deg

SMA: 7285.736 km

Apoapsis: 911.261 km

Periapsis: 903.942 km

RAAN: 41.8353 deg

Eccentricy: 0.0005023

Argument of periapsis: 344.7402 deg

Mean anomaly: 15.3607 deg

Mean motion: 13.96023031 rev/day

Mean motion (dot): 0.00000128 rev/day²

B* drag term: 0.00012657325 1/R_Earth

Two-line elements (TLE)

Creation date: Dec. 12, 2025, 10:14 a.m.

Reference frame: TEME

Reference center: EARTH

Epoch: Dec. 12, 2025, 3:27 a.m. UTC

TLE line 0: 0 MOS 1B (MOMO 1B)

TLE line 1: 1 20478U 90013A 25346.14378334 .00000128 00000-0 12657-3 0 9992

TLE line 2: 2 20478 99.2474 41.8353 0005023 344.7402 15.3607 13.96023031745934

Live tracking on map

Real-time ground track for satellite MOS 1B (MOMO 1B).

In-orbit conjunctions

A list of the most updated potential collisions computed for object MOS 1B (MOMO 1B).

Target	Orbit	TCA	Probability of collision	Miss distance	Type
DELTA 1 DEB	SSO	2025-09-15 23:18:09	0.0001055332	755.0 (m)	DEBRIS
SOLRAD 7A	LEO	2025-03-26 18:00:24	0.0002730197	209.0 (m)	PAYLOAD
COSMOS 2251 DEB	LEO	2024-09-10 11:29:35	0.0002470665	247.0 (m)	DEBRIS
METEOR 2-17 DEB	LEO	2024-08-11 04:43:23	0.0001119291	247.0 (m)	DEBRIS
SL-14 DEB	LEO	2024-08-08 06:02:19	0.0003949577	304.0 (m)	DEBRIS

Associated space launch

Japanese Earth observation satellite

MOS 1B (MOMO 1B) was lifted into orbit during the mission ‘H-1 | Momo 1b’, on board a H-1 space rocket.

The launch took place on Feb. 7, 1990, 1:33 a.m. from Osaki Launch Complex.

For more information about the launch, click the button.

H-1 | Momo 1b

Agency: N/A

Status: Launch Successful

Launch date: Feb. 7, 1990, 1:33 a.m. UTC

Rocket: H-1

Launch pad: Osaki Launch Complex

Location: Tanegashima Space Center, Japan

...

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