CASSIOPEIA LEADER: CO₂ emissions 2018–2025

CASSIOPEIA LEADER against its type

Built in 1999, it is 9 years older than the median vehicle carrier on this register, which was built in 2008 (595 vessels with a known build year). At 57,455 gross tonnage it is smaller than 63% of the other 571 vehicle carriers with a recorded tonnage. It is one of 66 vehicle carriers here under the Japan flag, 9.3% of the 713 on the register. The same builder is recorded for 136 other vessels here, 36 of them vehicle carriers. The returns for 2018–2025 all give TOKYO as port of registry.

Its 6,683 t of CO₂ for 2025 is close to the median of 7,074 t among the 514 vehicle carriers on this register that reported for 2025. Per nautical mile it emitted 310.5 kg CO₂, close to the type median of 309.1 kg. It logged 1,620 hours at sea against a median of 1,639 hours for its type that year. 3.9% of its 2025 emissions were at berth; the median for vehicle carriers was 3.1%. Across 7 years with reported emissions, the highest was 2023 (14,726 t) and the lowest 2022 (2,370 t). Its efficiency percentile within the type went from 8 in 2018 to 70 in 2025 (lower is more efficient). Of the 4 sister ships listed below with a 2025 return, 1 reported a lower CO₂ per nautical mile than this vessel.

Emissions by year2018–2025

Vessel particulars

IMO number

9182277

Ship type

Vehicle carrier

Gross tonnage

57,455

Length overall

199.9 m

Year built

1999

Flag state

Japan per EU MRV 2025

Builder

Imabari Shipbuilding Marugame Headquarters

Port of registry

TOKYO MRV 2025

Technical efficiency (design)

EEXI (14 gCO₂/t·nm)

Verifier

Nippon Kaiji Kyokai, Japan

Accreditation

VS-21325-01

Compliance document issued

2026-03-16

Compliance document expires

2027-06-30

Efficiency against its own type2025

Position 296 of 423 qualifying vehicle carriers by EEOI, at the 70th percentile. The dashed line is the type median, 51.7; this vessel reported 66.8.

EEOI divides emissions by transport work, which for this vessel and year was 99,998,354 tonne-miles over 21,520 nautical miles.

Reported CO₂ by year

Reported CO₂ in 2025 was 96.1% higher than in 2018, for EU/EEA voyages only. No return is recorded for 2024, so the series has gaps.

From 2023 to 2025, emissions fell 54.6% while distance sailed fell 51.1%and CO₂ per nautical mile fell 7.1%.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

6,788 t

Methane (CH₄)

0.11 t

Nitrous oxide (N₂O)

0.38 t

Under EU ETS

4,574 t, 68% of total

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).

This page draws on 7 MRV reporting years, an efficiency ranking and 5 of 5 vessel particulars. Not found in the sources for this vessel: AIS movements in Norwegian waters, 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.

Comparable vesselssister ships and nearest by tonnage

• SEVEN SEAS HIGHWAY sister · 2001 · 55,493 GT · 6,081 t · 328.6 kg/nm
• PRESTIGE ACE sister · 2000 · 55,878 GT · 14,574 t · 314.3 kg/nm
• TRIUMPH ACE sister · 2000 · 55,880 GT · 5,973 t · 326.1 kg/nm
• MERIDIAN ACE sister · 2000 · 56,175 GT · 8,938 t · 302.5 kg/nm
• AH SHIN sister · 1999 · 57,449 GT · 6,597 t · 320.9 kg/nm
• ORION LEADER 1999 · 57,513 GT · 2,563 t · 314.2 kg/nm
• CRUX LEADER 1998 · 57,449 GT · 21,149 t · 333.7 kg/nm
• MORNING CHORUS 2007 · 57,536 GT · 6,053 t · 338.9 kg/nm