Chemical tanker · Portugal flag · built 2011
ASTER ALVAR: CO₂ emissions 2018–2025
IMO 9528902 MMSI 255806384EU ETS8 reporting years
- CO₂ reported 2025
- 8,061 t
- Fuel burned
- 2,543 t
- Distance
- 36,416 nm
- Time at sea
- 3,781 h
- Emitted at berth
- 9% of total
- Share of year under way
- 43%
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ASTER ALVAR against its type
Built in 2011, it is 1 year newer than the median chemical tanker on this register, which was built in 2010 (1,951 vessels with a known build year). It is one of 71 chemical tankers here under the Portugal flag, 3.0% of the 2,344 on the register. Its MRV returns name it OCEANIC INDIGO for 2018, ASTER ALVAR for 2019–2023 and GTM DENMARK for 2024–2025. The reported port of registry changed: Limassol (2018), then Gibraltar (2019–2021), then Madeira (2022–2025).
Its 8,061 t of CO₂ for 2025 is 46% above the median of 5,531 t among the 1,484 chemical tankers on this register that reported for 2025. Per nautical mile it emitted 221.4 kg CO₂, 12% below the type median of 250.2 kg. It logged 3,781 hours at sea against a median of 2,106 hours for its type that year. 8.9% of its 2025 emissions were at berth; the median for chemical tankers was 6.6%. Across 8 years with reported emissions, the highest was 2019 (9,094 t) and the lowest 2018 (1,307 t). Its efficiency percentile within the type went from 99 in 2019 to 94 in 2025 (lower is more efficient). Of the 3 comparable vessels listed below with a 2025 return, 1 reported a lower CO₂ per nautical mile than this vessel.
Emissions by year2018–2025
| Year | CO₂ (t) | Fuel (t) | Distance (nm) | At sea (h) | At berth (t) | kg CO₂/nm | EEOI | Percentile |
|---|---|---|---|---|---|---|---|---|
| 2025 | 8,061 | 2,543 | 36,416 | 3,781 | 717 | 221.4 | 41.3 | 94 |
| 2024 | 7,890 | 2,476 | 37,025 | 4,051 | 507 | 213.1 | 31.0 | 82 |
| 2023 | 8,274 | 2,608 | 43,290 | 4,388 | 571 | 191.1 | 33.4 | 85 |
| 2022 | 8,132 | 2,554 | 39,615 | 3,805 | 1,185 | 205.3 | 43.3 | 95 |
| 2021 | 7,672 | 2,394 | 34,871 | 3,367 | 1,009 | 220.0 | 41.3 | 93 |
| 2020 | 7,499 | 2,341 | 38,748 | 5,508 | 580 | 193.5 | 35.2 | 88 |
| 2019 | 9,094 | 2,891 | 41,660 | 6,806 | 787 | 218.3 | 39.0 | 99 |
| 2018 | 1,307 | 420 | — | 612 | 103 | 190.3 | 82.6 | not ranked |
Vessel particulars
- IMO number
- 9528902
- Previously reported as
- OCEANIC INDIGO, GTM DENMARK
- MMSI
- 255806384
- Call sign
- CQEH5
- Ship type
- Chemical tanker
- Length overall
- 129.6 m
- Beam
- 19.0 m
- Year built
- 2011
- Flag state
- Portugal per EU MRV 2025
- Port of registry
- Madeira MRV 2025
- Home port
- Madeira
- Ice class
- IA
- Technical efficiency (design)
- EEXI (9.75 gCO₂/t·nm)
- Verifier
- DNV, Germany
- Accreditation
- VS-16026-01
- Compliance document issued
- 2026-03-04
- Compliance document expires
- 2027-06-30
Efficiency against its own type2025
Position 1,262 of 1,348 qualifying chemical tankers by EEOI, at the 94th percentile. The dashed line is the type median, 14.4; this vessel reported 41.3.
EEOI divides emissions by transport work, which for this vessel and year was 194,992,017 tonne-miles over 36,416 nautical miles.
Reported CO₂ by year
Reported CO₂ in 2025 was 516.7% higher than in 2018, for EU/EEA voyages only.
From 2024 to 2025, emissions rose 2.2% while distance sailed fell 1.6%and CO₂ per nautical mile rose 3.9%.That points mainly to how efficiently it sailed, rather than the other.
Where the 2025 emissions occurred
Methane, nitrous oxide and EU ETS2025
- Total CO₂ equivalent
- 8,186 t
- Methane (CH₄)
- 0.13 t
- Nitrous oxide (N₂O)
- 0.46 t
- Under EU ETS
- 6,309 t, 78% of total
Observed movementsAIS · Norwegian waters
- First seen
- 21 Jul 2025
- Last seen
- 27 Feb 2026
- Days observed
- 6
- Positions
- 338
- Median speed
- 10.3 kn
Its recorded positions span 58.0°N to 60.8°N and 4.4°E to 10.8°E.
92 hourly points from 338 positions. Filled circle first, open circle last; squares are ports for orientation, not calls.
Positions recorded per month
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.
Verifier history
| From reporting year | Verifier | Accredited in |
|---|---|---|
| 2018 | VERIFAVIA (UK) LTD | United Kingdom |
| 2019 | DNV | Germany |
A change of verifier is not in itself a sign of anything being wrong.
Sources and how to read this
- Emissions: EU MRV publication (THETIS-MRV), reporting years 2018–2025, published by the European Commission.
- Vessel particulars: Wikidata (CC0) and Wikimedia Commons.
- Movements: Norwegian Coastal Administration open AIS extract.
This page draws on 8 MRV reporting years, an efficiency ranking, 3 of 5 vessel particulars, AIS movements in Norwegian waters, a name history and a licensed photograph. Not found in the sources for this vessel: 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.