Inclined Geosynchronous Orbit (IGSO)

Same altitude as GEO but tilted — traces a figure-8 ground track over a single longitude.

IGSO has the same 24-hour period as GEO but at an inclined orbital plane. The result: from the ground, the satellite traces a figure-8 pattern over a single longitude. China's BeiDou IGSO segment and Japan's QZSS Quasi-Zenith system use this to provide enhanced coverage at high latitudes where pure GEO performs poorly.

Examples

• SDO
• USA 169 (MILSTAR-2 4)
• USA 153
• LUDI TANCE-4 01A
• BEIDOU-3 IGSO-1 (C38)
• QZS-2 (QZSS/PRN 194)
• USA 167
• BEIDOU-2 IGSO-1 (C06)
• USA 170
• SKYNET 4C
• QZS-4 (QZSS/PRN 195)
• USA 99 (MILSTAR-1 1)
• BEIDOU-2 IGSO-2 (C07)
• USA 157 (MILSTAR-2 2)
• TDRS 3
• IRNSS-1B
• USA 149 (DSP 20)
• USA 115 (MILSTAR-1 2)
• BEIDOU-3 IGSO-3 (C40)
• USA 159 (DSP 21)
• TDRS 7
• USA 176 (DSP 22)
• TDRS 8
• FLTSATCOM 8 (USA 46)