1. Executive Summary
Using Jonathan C. McDowell’s General Catalog of Artificial Space Objects (GCAT) derived Current Catalog (data update 2026-01-18), there were 17,830 payload satellites still in space in Earth-orbit regimes (including 445 with an unclassified orbit code), of which 14,277 were listed as active (operational) and 3,553 were inactive payloads still in orbit. The current satellite population is dominated by large commercial communications constellations, especially in lower low-Earth orbit. Category and operator breakdowns below quantify this distribution. [1]–[3]
Independent environment reporting shows broadly consistent trends but with different definitions and data cut dates. ESA’s Space Environment Report 2025 notes ~40,000 tracked objects and ~11,000 active payloads as of early 2025, while ESA DISCOS statistics summarize ~15,860 satellites still in space and ~12,900 still functioning (rounded figures) using DISCOS classifications. [4], [5]
2. Definitions and Method
- Satellite is treated as a payload (not rocket bodies, components, or debris).
- Operational/active follows GCAT Current Catalog “Active” flag =
A(active satellite).Pdenotes inactive payloads still in orbit. [2] - Earth orbit is approximated by excluding GCAT orbit tags that denote cislunar/deep-space regimes (e.g.,
CLO,DSO). Objects with orbit tag-are counted separately as “unclassified orbit code.” - Mission category uses GCAT payload catalog “Category” codes (e.g.,
COM,IMG) and their definitions. [3]
3. Current Counts
| Metric | Count |
|---|---|
| Payload satellites (active + inactive) in Earth orbit (incl. unclassified orbit code) | 17,830 |
| Operational/active satellites in Earth orbit (active payloads) | 14,277 |
| Inactive payloads still in orbit (non-operational satellites) | 3,553 |
| Payload satellites with a classified orbit regime (subset of above) | 17,385 |
Note: The count above is limited to payloads still in space per GCAT Current Catalog and excludes objects flagged with deep-space/cislunar orbit tags. [2]
4. Satellites by Orbit Regime
| Orbit regime (GCAT OpOrbit grouping) | Payloads in orbit (total) | Operational/active |
|---|---|---|
| Lower LEO | 11,928 | 11,613 |
| LEO | 3,435 | 1,840 |
| MEO | 463 | 151 |
| GEO / synchronous | 1,370 | 564 |
| HEO | 90 | 23 |
| VHEO | 39 | 7 |
| GTO / transfer | 60 | 4 |
| Unknown | 445 | 75 |
“Lower LEO” corresponds to GCAT LLEO-tagged operational orbit categories and is where many broadband constellations operate.
“GEO / synchronous” aggregates GEO/* categories. [2]
5. Satellites by Mission Category and Function
| Category code | Function (GCAT definition) | Payloads in orbit (total) | Operational/active |
|---|---|---|---|
| COM | Communications | 13,247 | 11,597 |
| IMG | Imaging (optical) | 1,048 | 920 |
| TECH | Technology and training | 708 | 471 |
| NAV | Navigation / positioning / timing | 584 | 233 |
| SIG | Signals intelligence | 423 | 201 |
| IMG-R | Imaging (radar) | 205 | 192 |
| MET | Meteorology (imaging) | 271 | 101 |
| SCI | Scientific studies (non-Earth-observing, non-astronomy) | 191 | 72 |
| EOSCI | Earth observing science (non-imaging) | 74 | 67 |
| AST | Astronomy | 99 | 50 |
| MET-RO | Meteorology (radio occultation) | 53 | 48 |
| COM/MET-RO | Communications + Meteorology (radio occultation) | 51 | 39 |
| EW | Missile early warning / BMD tracking | 128 | 33 |
| SIG* | Signals intelligence | 36 | 30 |
| Unknown | Unspecified / unknown | 195 | 28 |
| COM? | Communications | 26 | 25 |
| NAV/COM | Navigation / positioning / timing + Communications | 22 | 20 |
| EW* | Missile early warning / BMD tracking | 26 | 19 |
| COM* | Communications | 15 | 14 |
| SIG?* | Signals intelligence | 14 | 14 |
| IMG* | Imaging (optical) | 11 | 10 |
| COM/TECH | Communications + Technology and training | 11 | 7 |
| IMG? | Imaging (optical) | 7 | 7 |
| GEOD | Geodesy | 58 | 5 |
| CAL | Calibration (passive targets, radar calibration, etc.) | 41 | 5 |
| TECH? | Technology and training | 7 | 5 |
| MGRAV | Microgravity experiments | 6 | 5 |
| IMG-R* | Imaging (radar) | 5 | 5 |
| TECH* | Technology and training | 15 | 4 |
| SIG? | Signals intelligence | 5 | 4 |
| IMG-R? | Imaging (radar) | 4 | 4 |
| SS | Human spaceflight (crew/cargo vehicles) | 22 | 3 |
| AST/SCI | Astronomy + Scientific studies (non-Earth-observing, non-astronomy) | 4 | 3 |
| TECH/AST | Technology and training + Astronomy | 4 | 3 |
| SIG/IMG | Signals intelligence + Imaging (optical) | 3 | 3 |
| COM/MET | Communications + Meteorology (imaging) | 11 | 2 |
| IMG/SCI | Imaging (optical) + Scientific studies (non-Earth-observing, non-astronomy) | 4 | 2 |
| EW? | Missile early warning / BMD tracking | 2 | 2 |
| IMG?* | Imaging (optical) | 2 | 2 |
| IMG/COM | Imaging (optical) + Communications | 2 | 2 |
| TECH/EW | Technology and training + Missile early warning / BMD tracking | 2 | 2 |
| SCI/COM | Scientific studies (non-Earth-observing, non-astronomy) + Communications | 2 | 2 |
| AST/TECH | Astronomy + Technology and training | 2 | 2 |
| EOSCI/AST | Earth observing science (non-imaging) + Astronomy | 2 | 2 |
| TECH/COM | Technology and training + Communications | 3 | 1 |
| COM/SIG | Communications + Signals intelligence | 2 | 1 |
| SCI/AST | Scientific studies (non-Earth-observing, non-astronomy) + Astronomy | 2 | 1 |
| BIO | Biology and life sciences | 2 | 1 |
| AST/EW | Astronomy + Missile early warning / BMD tracking | 1 | 1 |
| BIO/TECH | Biology and life sciences + Technology and training | 1 | 1 |
| MET/IMG-R | Meteorology (imaging) + Imaging (radar) | 1 | 1 |
| COM/SCI | Communications + Scientific studies (non-Earth-observing, non-astronomy) | 1 | 1 |
| TECH/IMG-R? | Technology and training + Imaging (radar) | 1 | 1 |
| SCI/MET | Scientific studies (non-Earth-observing, non-astronomy) + Meteorology (imaging) | 1 | 1 |
| EOSCI/MET | Earth observing science (non-imaging) + Meteorology (imaging) | 1 | 1 |
| EOSCI/SCI | Earth observing science (non-imaging) + Scientific studies (non-Earth-observing, non-astronomy) | 1 | 1 |
| PLAN | Deep-space related mission (flagged in Earth orbit catalogs) | 112 | 0 |
| TARG | Target for missile defense / ASAT tests | 9 | 0 |
| IMG/IMG-R | Imaging (optical) + Imaging (radar) | 7 | 0 |
| SCI/PLAN | Scientific studies (non-Earth-observing, non-astronomy) + Deep-space related mission (flagged in Earth orbit catalogs) | 4 | 0 |
| TECH/IMG | Technology and training + Imaging (optical) | 4 | 0 |
| WEAPON | Weapon / ASAT experiment / FOBS | 4 | 0 |
| COM/IMG | Communications + Imaging (optical) | 4 | 0 |
| SCI/TECH | Scientific studies (non-Earth-observing, non-astronomy) + Technology and training | 2 | 0 |
| TECH/SCI | Technology and training + Scientific studies (non-Earth-observing, non-astronomy) | 2 | 0 |
| TECH/PLAN | Technology and training + Deep-space related mission (flagged in Earth orbit catalogs) | 2 | 0 |
| MET/COM | Meteorology (imaging) + Communications | 2 | 0 |
| COM/NAV | Communications + Navigation / positioning / timing | 1 | 0 |
| IMG/AST | Imaging (optical) + Astronomy | 1 | 0 |
| SIG/AST | Signals intelligence + Astronomy | 1 | 0 |
| EW/TECH | Missile early warning / BMD tracking + Technology and training | 1 | 0 |
| MET/IMG | Meteorology (imaging) + Imaging (optical) | 1 | 0 |
| TECH/MISC | Technology and training + Miscellaneous | 1 | 0 |
| MET/SCI | Meteorology (imaging) + Scientific studies (non-Earth-observing, non-astronomy) | 1 | 0 |
| TECH/EOSCI | Technology and training + Earth observing science (non-imaging) | 1 | 0 |
| PLAN/RV | Deep-space related mission (flagged in Earth orbit catalogs) + RV | 1 | 0 |
| IMG-R/EOSCI | Imaging (radar) + Earth observing science (non-imaging) | 1 | 0 |
| COM/AST | Communications + Astronomy | 1 | 0 |
| AST/IMG | Astronomy + Imaging (optical) | 1 | 0 |
| SCI/IMG-R | Scientific studies (non-Earth-observing, non-astronomy) + Imaging (radar) | 1 | 0 |
GCAT category codes are defined in the payload catalog documentation; codes may include qualifiers such as ? (uncertain) or * (historically secret orbit elements). [3]
6. Operator and Ownership Breakdown
6.1 Operator organizations (top 15 by active satellites)
| Owner code | Short name | Organization name | Owner state | Active satellites |
|---|---|---|---|---|
| SPXS | SpaceX/Seattle | SpaceX (Seattle) | US | 9,485 |
| ONEWEBE | Eut. One Web | Eutelsat One Web (Network Access Associates Ltd.) | UK | 652 |
| NROC | NRO | National Reconnaissance Office | US | 253 |
| KUIP | Kuiper Systems | Kuiper Systems LLC | US | 180 |
| ZXW | Zhongguo Xingwang | Zhongguo Weixing Wangluo Jituan YG | CN | 163 |
| JHB | PLA MSF | ZRJ Junshi Hangtian Budui | CN | 151 |
| PLAN | Planet | Planet Labs, Inc. (Planet) | US | 138 |
| YUANX | Yuanxin WK | Shanghai Yuanxin Weixing Keji YG | CN | 94 |
| CGSTL | Changguang WJ | Changguang weixing jishu youxian gongsi | CN | 91 |
| IRIDS | Iridium | Iridium Satellite LLC | US | 80 |
| SFSSC | USSF SSC | US Space Force Space Systems Command | US | 74 |
| CNSA | CNSA | Guojia Hangtian Ju | CN | 70 |
| SDA | SDA | Space Development Agency | US | 69 |
| GEESP | GeeSpace | GeeSpace | CN | 60 |
| ISRO | ISRO | Indian Space Research Organization | IN | 51 |
6.2 Operator class (commercial, civil, defense, amateur)
| Class | Payloads in orbit (total) | Operational/active |
|---|---|---|
| Commercial | 12,903 | 12,208 |
| Defense/intelligence | 2,718 | 1,028 |
| Civil government | 1,622 | 727 |
| Amateur/academic | 377 | 271 |
| Unknown | 196 | 29 |
| Commercial + Defense/intelligence | 5 | 5 |
| Civil government + Defense/intelligence | 5 | 5 |
| Civil government + Commercial | 4 | 4 |
6.3 Operator country/state (top 12 by active satellites)
| Owner state | Active satellites |
|---|---|
| US | 10,892 |
| CN | 1,163 |
| UK | 711 |
| RU | 332 |
| J | 119 |
| F | 90 |
| IN | 72 |
| I | 72 |
| D | 66 |
| KR | 58 |
| CA | 55 |
| I-EU | 40 |
Operator codes and names are mapped via GCAT’s organizations table. [6]
7. Frequencies Used
Satellite frequency use depends on service type (e.g., fixed-satellite service (FSS), mobile-satellite service (MSS), Earth exploration-satellite service (EESS), radionavigation-satellite service (RNSS)), ITU filings, national licensing, and link direction (space-to-Earth vs. Earth-to-space). The following summarizes common bands and representative, well-documented examples. For authoritative allocations, consult the FCC Table of Frequency Allocations and ITU-R materials. [7]–[9]
| Band / range (typ.) | Common satellite uses | Examples / references |
|---|---|---|
| VHF (~137–138 MHz) | Low-rate direct broadcast meteorological downlinks; amateur and science beacons in adjacent allocations | NOAA polar-orbiting APT/HRPT user guides and operational frequency listings (e.g., NOAA-15). [10] |
| L-band (~1.1–1.7 GHz) | GNSS/RNSS navigation and timing; some MSS links; TT&C for certain spacecraft | GPS L1/L2/L5 carrier frequencies; similar GNSS signals in adjacent allocations. [11], [12] |
| S-band (~2.0–2.3 GHz) | Telemetry, tracking, and command (TT&C); space operations/space research; some MSS | ITU and agency spectrum-management references for S-band space services. [9] |
| X-band (~8.0–8.4 GHz) | High-rate downlinks for Earth observation and science; TT&C for some missions | Commonly used for EESS downlink and deep space (mission-dependent); see ITU space regulatory framework. [8], [9] |
| Ku-band (~10.7–12.7 GHz down / 14.0–14.5 GHz up) | FSS broadband, broadcast, feeder links; NGSO broadband constellations | FCC definitions and band pairings in 47 CFR Part 25; FCC public notices list these bands for specific systems. [7], [13] |
| Ka-band (~17.7–20.2 GHz down / 27.5–30.0 GHz up) | High-throughput satellite (HTS) and NGSO broadband; higher-capacity feeder links | FCC Part 25 and system authorizations (e.g., SpaceX, others) cover Ka allocations. [7], [13] |
| Higher bands (Q/V, E, W; >~37 GHz) | Experimental and high-capacity feeder links; emerging direct-to-device and backhaul concepts | Example: FCC order/authorizations describing SpaceX use of bands above 37 GHz (including E/W ranges) and supplemental coverage frequencies within the U.S. [14] |
This report does not attempt to enumerate per-satellite frequency assignments; those are maintained in regulatory filings (ITU SRS, FCC IBFS) and operator technical documentation. [7], [8]
8. Interpretation Notes
- Counts vary by source because “satellite,” “payload,” “active,” and “functioning” are defined differently, and datasets have different update cadences. [2], [4], [5]
- Megaconstellations skew distributions: in this snapshot, SpaceX’s Starlink accounts for the majority of active satellites (top operator table). [2], [6]
- Mission categories are broad: satellites often support multiple services (e.g., communications + radio occultation). GCAT represents this with dual categories (e.g.,
COM/MET-RO). [3]
References (IEEE Style)
- [1] J. C. McDowell, “Active Payloads in Earth Orbit,” Planet4589 / Jonathan’s Space Report, updated Jan. 2026. [Online]. Available: https://planet4589.org/space/stats/active.html. [Accessed: Jan. 20, 2026].
- [2] J. C. McDowell, “GCAT Derived Catalog: Current Catalog (column descriptions),” Planet4589, data update 2026-01-18. [Online]. Available: https://planet4589.org/space/gcat/web/derived/curcols.html. [Accessed: Jan. 20, 2026].
- [3] J. C. McDowell, “GCAT Payload Catalog Column Descriptions (Class and Category definitions),” Planet4589, release 1.8.0. [Online]. Available: https://planet4589.org/space/gcat/web/cat/pcols.html. [Accessed: Jan. 20, 2026].
- [4] European Space Agency, “ESA Space Environment Report 2025,” ESA Space Safety, Apr. 1, 2025. [Online]. Available: https://www.esa.int/Space_Safety/Space_Debris/ESA_Space_Environment_Report_2025. [Accessed: Jan. 20, 2026].
- [5] European Space Agency, “Space Environment Statistics (DISCOS),” ESA/ESOC, n.d. [Online]. Available: https://sdup.esoc.esa.int/discosweb/statistics/. [Accessed: Jan. 20, 2026].
- [6] J. C. McDowell, “GCAT Organizations Table (orgs),” Planet4589, data update 2026-01-18. [Online]. Available: https://planet4589.org/space/gcat/data/tables/orgs.html. [Accessed: Jan. 20, 2026].
- [7] Federal Communications Commission, “47 CFR Part 25—Satellite Communications,” eCFR, n.d. [Online]. Available: https://www.ecfr.gov/current/title-47/chapter-I/subchapter-B/part-25. [Accessed: Jan. 20, 2026].
- [8] International Telecommunication Union, “ITU Radio Regulatory Framework for Space Services,” ITU-R, n.d. (PDF). [Online]. Available: https://www.itu.int/en/ITU-R/space/snl/Documents/ITU-Space_reg.pdf. [Accessed: Jan. 20, 2026].
- [9] Federal Communications Commission, “FCC Online Table of Frequency Allocations,” FCC, Mar. 31, 2025 (PDF). [Online]. Available: https://www.fcc.gov/sites/default/files/fcctable.pdf. [Accessed: Jan. 20, 2026].
- [10] World Meteorological Organization, “OSCAR/Space: NOAA-15 (frequency listings),” WMO, n.d. [Online]. Available: https://space.oscar.wmo.int/satellites/view/noaa_15. [Accessed: Jan. 20, 2026].
- [11] National Institute of Standards and Technology, “Time and Frequency from A to Z: GPS,” NIST, n.d. [Online]. Available: https://www.nist.gov/pml/time-and-frequency-division/popular-links/time-frequency-z/time-and-frequency-z-g. [Accessed: Jan. 20, 2026].
- [12] European Space Agency, “GPS Signal Plan,” Navipedia, n.d. [Online]. Available: https://gssc.esa.int/navipedia/index.php/GPS_Signal_Plan. [Accessed: Jan. 20, 2026].
- [13] Federal Communications Commission, “Public Notice (example Ku-band FSS operations 14.0–14.5 GHz uplink / 10.7–12.7 GHz downlink),” FCC, May 7, 2025 (PDF). [Online]. Available: https://docs.fcc.gov/public/attachments/DOC-411304A1.pdf. [Accessed: Jan. 20, 2026].
- [14] Federal Communications Commission, “Space Exploration Holdings, LLC (ICFS File Nos.)—Order,” FCC, Jan. 9, 2026 (PDF). [Online]. Available: https://docs.fcc.gov/public/attachments/DA-26-36A1.pdf. [Accessed: Jan. 20, 2026].
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- [16] T. Pratt, C. W. Bostian, and J. E. Allnutt, Satellite Communications, 2nd ed. Hoboken, NJ, USA: Wiley, 2003.
- [17] J. R. Wertz and W. J. Larson (eds.), Space Mission Analysis and Design, 3rd ed. Torrance, CA, USA: Microcosm Press, 1999.
- [18] E. D. Kaplan and C. J. Hegarty (eds.), Understanding GPS/GNSS: Principles and Applications, 3rd ed. Norwood, MA, USA: Artech House, 2017.