Oil tanker · Marshall Islands flag · built 2016
IONIC ALTHEA
IMO 9728435 MMSI 538007953EU ETS6 reporting years
- CO₂ reported 2025
- 23,446 t
- Fuel burned
- 7,489 t
- Distance
- 54,415 nm
- Time at sea
- 5,022 h
- Emitted at berth
- 8% of total
- Share of year under way
- 57%
- Gross tonnage
- 63,771
Vessel particulars
- IMO number
- 9728435
- MMSI
- 538007953
- Ship type
- Oil tanker
- Gross tonnage
- 63,771
- Length overall
- 249.9 m
- Beam
- 44.0 m
- Year built
- 2016
- Flag state
- Marshall Islands
- Port of registry
- Majuro
- Technical efficiency (design)
- EEDI (3.08 gCO₂/t·nm)
- Verifier
- Nippon Kaiji Kyokai, Japan
- Accreditation
- VS-21325-01
- Compliance document issued
- 2026-01-28
- Compliance document expires
- 2027-06-30
Flag state is derived from rapportert, not reported directly, and reflects the registry at the time of reporting.
Efficiency against its own type2025
Position 889 of 1,448 qualifying oil tankers by EEOI, at the 61th percentile. The dashed line is the type median, 7.5; this vessel reported 8.4.
EEOI divides emissions by transport work, which for this vessel and year was 2,797,819,809 tonn-nmover 54,415 nautical miles.
Reported CO₂ by year
Between 2020 and 2025 reported CO₂ rose by 336.9%.
From 2024 to 2025, emissions fell 5.8% and CO₂ per nautical mile rose 8.0%.Distance was not reported for both years, so activity and efficiency cannot be separated here.
Annual returns2020–2025
| Year | CO₂ (t) | Fuel (t) | Distance (nm) | At sea (h) | At berth (t) | kg CO₂/nm | EEOI | Percentile |
|---|---|---|---|---|---|---|---|---|
| 2025 | 23,446 | 7,489 | 54,415 | 5,022 | 1,876 | 430.9 | 8.4 | 61 |
| 2024 | 24,885 | 7,969 | — | 5,255 | 0 | 398.9 | — | — |
| 2023 | 18,039 | 5,770 | 44,093 | 3,804 | 844 | 409.1 | 7.8 | 49 |
| 2022 | 7,308 | 2,337 | 18,999 | 1,578 | 440 | 384.7 | 6.9 | 38 |
| 2021 | 17,410 | 5,562 | 40,280 | 3,580 | 1,695 | 432.2 | 8.8 | 54 |
| 2020 | 5,367 | 1,715 | 12,316 | 1,229 | 824 | 435.7 | 9.7 | 58 |
Where the 2025 emissions occurred
Methane, nitrous oxide and EU ETS2025
- Total CO₂ equivalent
- 23,813 t
- Methane (CH₄)
- 0.37 t
- Nitrous oxide (N₂O)
- 1.35 t
- Under EU ETS
- 12,661 t, 54% of total
Observed movementsAIS · Norwegian waters
- First seen
- 05 Apr 2026
- Last seen
- 08 Apr 2026
- Days observed
- 4
- Positions
- 208
- Median speed
- 7.2 kn
37 points sampled hourly from 208 recorded positions. The filled circle is the first observed position, the open one the last. Named squares are ports, shown for orientation; they are not recorded calls.
Norwegian waters only, 01 Jul 2025 to 27 Jul 2026. A gap here means the vessel was not recorded in that area. It is not evidence that the vessel was idle, and not evidence that a transponder was switched off. Voyages elsewhere are outside this dataset.
Sources and how to read this
- Emissions: EU MRV publication (THETIS-MRV), reporting years 2020–2025, published by the European Commission.
- Vessel particulars: Wikidata (CC0).
- Movements: Norwegian Coastal Administration open AIS extract.
What this page is built on
- Reporting years
- 6
- Ranked by efficiency
- yes
- Vessel particulars
- 4 of 5
- Movement data
- yes
- Name history
- none recorded
- Photograph
- none licensed
- Sanctions record
- none
- Inspection record
- none in US waters
Caveats that apply to every vessel page
EEOI above 100,000 is withheld. Those values come from returns where reported transport work is near zero, which makes the ratio meaningless rather than extreme. Median across the dataset is around 12.
Emission categories overlap. In the MRV return, emissions at berth are also counted inside the voyage legs, so the categories do not sum to the total. They are shown side by side rather than stacked for that reason.
Distance is derived, intensity is reported. The MRV return publishes CO₂ per nautical mile but not the distance itself, which is null in all 106,564 rows of the source. The distance column is therefore filled from the ranking step, which reconstructs it, and is blank for years where a vessel was not ranked. That is why a row can show an intensity without a distance.
Percentile is within type and year. It is the vessel's position among qualifying ships of the same type that year, where lower is more efficient. A blank means the vessel did not qualify for ranking that year.
Sister ships share a builder, a type and a build year within two years of this vessel. That holds hull and machinery roughly constant and leaves operation as the variable, which is why they are listed before nearest-by-tonnage.
Methane and nitrous oxide start in 2024. They were not reported before that period, so earlier years cannot be compared against them.
Technical efficiency is a design figure fixed at construction. A vessel can hold a good index and still emit heavily by sailing fast, waiting at anchor or carrying little.
Inspection records cover United States waters only. An empty record is not evidence of a clean history elsewhere.
Empty means unreported, never zero. Nothing here is modelled, estimated or interpolated. See the methodology.
Something wrong on this page? See corrections. We do not hold the source registers and cannot amend them, but we will fix anything we have got wrong in reproducing them.