Oil tanker · Marshall Islands flag · built 2008
CHRYSTAL SKY: CO₂ emissions 2018–2024
IMO 9334569 EU ETS5 reporting years
- CO₂ reported 2024
- 3,290 t
- Fuel burned
- 1,037 t
- Time at sea
- 732 h
- Emitted at berth
- 12% of total
- Share of year under way
- 8%
- Gross tonnage
- 40,865
CHRYSTAL SKY against its type
Built in 2008, it is 2 years older than the median oil tanker on this register, which was built in 2010 (2,896 vessels with a known build year). At 40,865 gross tonnage it is smaller than 66% of the other 2,841 oil tankers with a recorded tonnage. It is one of 793 oil tankers here under the Marshall Islands flag, 22.4% of the 3,548 on the register. The same builder is recorded for 103 other vessels here, 61 of them oil tankers. Its MRV returns name it POLAR UNICORN for 2018–2021 and CHRYSTAL SKY for 2022–2024. The reported port of registry changed: Majuro (2019), then Majuro, Marshall Islands (2021–2024).
Its 3,290 t of CO₂ for 2024 is 60% below the median of 8,196 t among the 1,808 oil tankers on this register that reported for 2024. Per nautical mile it emitted 389.7 kg CO₂, close to the type median of 408.2 kg. It logged 732 hours at sea against a median of 2,020 hours for its type that year. 11.6% of its 2024 emissions were at berth; the median for oil tankers was 7.2%. Across 5 years with reported emissions, the highest was 2021 (16,872 t) and the lowest 2022 (1,836 t). Its efficiency percentile within the type went from 58 in 2018 to 33 in 2022 (lower is more efficient). Of the 4 sister ships listed below with a 2024 return, 4 reported a lower CO₂ per nautical mile than this vessel.
Emissions by year2018–2024
| Year | CO₂ (t) | Fuel (t) | Distance (nm) | At sea (h) | At berth (t) | kg CO₂/nm | EEOI | Percentile |
|---|---|---|---|---|---|---|---|---|
| 2024 | 3,290 | 1,037 | — | 732 | 381 | 389.7 | — | — |
| 2022 | 1,836 | 579 | 4,906 | 437 | 27 | 374.3 | 6.5 | 33 |
| 2021 | 16,872 | 5,415 | 37,901 | 3,192 | 105 | 445.2 | 9.0 | 56 |
| 2019 | 5,709 | 1,824 | 11,460 | 2,008 | 330 | 498.2 | 8.5 | 50 |
| 2018 | 3,481 | 1,116 | 9,812 | 1,126 | 106 | 354.8 | 9.4 | 58 |
Vessel particulars
- IMO number
- 9334569
- Previously reported as
- POLAR UNICORN
- Ship type
- Oil tanker
- Gross tonnage
- 40,865
- Length overall
- 229.0 m
- Year built
- 2008
- Flag state
- Marshall Islands per EU MRV 2024
- Builder
- Onomichi Dockyard
- Port of registry
- Majuro, Marshall Islands MRV 2024
- Home port
- Majuro, Marshall Islands
- Ice class
- IA
- Technical efficiency (design)
- EIV (4.03 gCO₂/t·nm)
- Verifier
- NORMEC VERIFAVIA SAS, France
- Accreditation
- 3-2127
- Compliance document issued
- 2025-06-05
- Compliance document expires
- 2026-06-30
Efficiency against its own type2022
Position 579 of 1,771 qualifying oil tankers by EEOI, at the 33rd percentile. The dashed line is the type median, 8.0; this vessel reported 6.5.
EEOI divides emissions by transport work, which for this vessel and year was 280,762,997 tonne-miles over 4,906 nautical miles.
Reported CO₂ by year
Reported CO₂ in 2024 was 5.5% lower than in 2018, for EU/EEA voyages only. No return is recorded for 2020, 2023, so the series has gaps.
From 2022 to 2024, emissions rose 79.2% and CO₂ per nautical mile rose 4.1%.Distance is missing for at least one of the two years, so activity and efficiency cannot be separated here.
Where the 2024 emissions occurred
Methane, nitrous oxide and EU ETS2024
- Total CO₂ equivalent
- 3,341 t
- Methane (CH₄)
- 0.05 t
- Nitrous oxide (N₂O)
- 0.19 t
- Under EU ETS
- 1,948 t, 59% of total
Verifier history
| From reporting year | Verifier | Accredited in |
|---|---|---|
| 2018 | AMERICAN BUREAU OF SHIPPING HELLENIC SINGLE MEMBER LIMITED LIABILITY COMPANY (ABS HELLENIC S.M. LTD) | Greece |
| 2022 | Korean Register | Korea, Republic of |
| 2024 | NORMEC VERIFAVIA SAS | France |
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 2018–2024, published by the European Commission.
- Vessel particulars: Wikidata (CC0).
This page draws on 5 MRV reporting years, an efficiency ranking, 5 of 5 vessel particulars and a name history. Not found in the sources for this vessel: AIS movements in Norwegian waters, 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.