Chemical tanker · Marshall Islands flag · built 2019
STI MYSTERY: CO₂ emissions 2020–2025
IMO 9829461 MMSI 538010467EU ETS4 reporting years
- CO₂ reported 2025
- 10,867 t
- Fuel burned
- 3,472 t
- Distance
- 38,994 nm
- Time at sea
- 3,235 h
- Emitted at berth
- 5% of total
- Share of year under way
- 37%
- Gross tonnage
- 29,991
STI MYSTERY against its type
Built in 2019, it is 9 years newer than the median chemical tanker on this register, which was built in 2010 (1,951 vessels with a known build year). At 29,991 gross tonnage it is larger than 88% of the other 1,899 chemical tankers with a recorded tonnage. It is one of 474 chemical tankers here under the Marshall Islands flag, 20.2% of the 2,344 on the register. The same builder is recorded for 77 other vessels here, 27 of them chemical tankers. The reported port of registry changed: Singapore (2020–2021), then Majuro (2024–2025).
Its 10,867 t of CO₂ for 2025 is 2.0 times the median of 5,533 t among the 1,483 chemical tankers on this register that reported for 2025. Per nautical mile it emitted 278.7 kg CO₂, 11% above the type median of 250.2 kg. It logged 3,235 hours at sea against a median of 2,109 hours for its type that year. 5.0% of its 2025 emissions were at berth; the median for chemical tankers was 6.6%. Across 4 years with reported emissions, the highest was 2025 (10,867 t) and the lowest 2024 (1,403 t). Its efficiency percentile within the type went from 1 in 2020 to 18 in 2025 (lower is more efficient). Of the 5 sister ships listed below with a 2025 return, 3 reported a lower CO₂ per nautical mile than this vessel.
Emissions by year2020–2025
| Year | CO₂ (t) | Fuel (t) | Distance (nm) | At sea (h) | At berth (t) | kg CO₂/nm | EEOI | Percentile |
|---|---|---|---|---|---|---|---|---|
| 2025 | 10,867 | 3,472 | 38,994 | 3,235 | 544 | 278.7 | 8.9 | 18 |
| 2024 | 1,403 | 448 | 5,961 | 498 | 84 | 235.4 | 7.0 | 3 |
| 2021 | 4,166 | 1,326 | 15,768 | 1,407 | 484 | 264.2 | 7.5 | 3 |
| 2020 | 3,909 | 1,251 | 16,610 | 1,444 | 181 | 235.3 | 6.1 | 1 |
Vessel particulars
- IMO number
- 9829461
- MMSI
- 538010467
- Call sign
- V7A6081
- Ship type
- Chemical tanker
- Gross tonnage
- 29,991
- Length overall
- 183.0 m
- Beam
- 32.0 m
- Year built
- 2019
- Flag state
- Marshall Islands per EU MRV 2025
Sources disagree: Wikidata/AIS (undated) list Singapore. The flag shown is from the newest official source, the EU MRV return for 2025. - Port of registry
- Majuro MRV 2025
- Technical efficiency (design)
- EEXI (4.07 gCO₂/t·nm)
- Verifier
- DNV, Germany
- Accreditation
- VS-16026-01
- Compliance document issued
- 2026-02-16
- Compliance document expires
- 2027-06-30
Efficiency against its own type2025
Position 244 of 1,348 qualifying chemical tankers by EEOI, at the 18th percentile. The dashed line is the type median, 14.4; this vessel reported 8.9.
EEOI divides emissions by transport work, which for this vessel and year was 1,218,300,448 tonne-miles over 38,994 nautical miles.
Reported CO₂ by year
Reported CO₂ in 2025 was 178.0% higher than in 2020, for EU/EEA voyages only. No return is recorded for 2022, 2023, so the series has gaps.
From 2024 to 2025, emissions rose 674.4% while distance sailed rose 554.2%and CO₂ per nautical mile rose 18.4%.That points mainly to how much the vessel sailed, rather than the other.
Where the 2025 emissions occurred
Methane, nitrous oxide and EU ETS2025
- Total CO₂ equivalent
- 11,038 t
- Methane (CH₄)
- 0.17 t
- Nitrous oxide (N₂O)
- 0.62 t
- Under EU ETS
- 6,147 t, 57% of total
Observed movementsAIS · Norwegian waters
- First seen
- 04 Nov 2025
- Last seen
- 14 Nov 2025
- Days observed
- 10
- Positions
- 311
- Median speed
- 11.9 kn
Its recorded positions span 58.0°N to 60.9°N and 4.4°E to 5.1°E.
184 hourly points from 311 positions. Filled circle first, open circle last; squares are ports for orientation, not calls.
Norwegian Coastal Administration open AIS, Norwegian waters only, 01 Jul 2025 to 27 Jul 2026. A gap means the vessel was not recorded here, not that it was idle or that a transponder was off.
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.
This page draws on 4 MRV reporting years, an efficiency ranking, 5 of 5 vessel particulars and AIS movements in Norwegian waters. Not found in the sources for this vessel: a name history, a licensed photograph, a sanctions listing and US port state inspections.
Empty means unreported, never zero. How EEOI, distance, percentiles and sister ships are handled is explained under reading a vessel page. Something wrong? See corrections.