CASSIOPEIA: CO₂ emissions 2018–2022

CASSIOPEIA against its type

Built in 2006, it is 4 years older than the median oil tanker on this register, which was built in 2010 (2,896 vessels with a known build year). At 57,248 gross tonnage it is smaller than 53% of the other 2,841 oil tankers with a recorded tonnage. It is one of 718 oil tankers here under the Liberia flag, 20.2% of the 3,548 on the register. The same builder is recorded for 461 other vessels here, 179 of them oil tankers. The returns for 2018–2022 all give Monrovia as port of registry.

Its 6,936 t of CO₂ for 2022 is close to the median of 7,189 t among the 1,939 oil tankers on this register that reported for 2022. Per nautical mile it emitted 349.0 kg CO₂, 16% below the type median of 415.9 kg. It logged 2,571 hours at sea against a median of 1,731 hours for its type that year. 9.3% of its 2022 emissions were at berth; the median for oil tankers was 9.1%. Across 5 years with reported emissions, the highest was 2020 (25,060 t) and the lowest 2022 (6,936 t). Its efficiency percentile within the type went from 47 in 2018 to 35 in 2022 (lower is more efficient). Of the 4 sister ships listed below with a 2022 return, 0 reported a lower CO₂ per nautical mile than this vessel.

Emissions by year2018–2022

Vessel particulars

IMO number

9341081

Previously reported as

NS CLIPPER

MMSI

461000252

Call sign

A4DU6

Ship type

Oil tanker

Gross tonnage

57,248

Length overall

244.0 m

Beam

42.0 m

Year built

2006

Flag state

Liberia per EU MRV 2022

Builder

HD Hyundai Samho

Port of registry

Monrovia MRV 2022

Home port

Monrovia

Technical efficiency (design)

EIV (3.27 gCO₂/t·nm)

Verifier

Indian Register of Shipping, India

Accreditation

V 107

Compliance document issued

2023-05-30

Compliance document expires

2024-06-30

Efficiency against its own type2022

Position 613 of 1,771 qualifying oil tankers by EEOI, at the 35th percentile. The dashed line is the type median, 8.0; this vessel reported 6.7.

EEOI divides emissions by transport work, which for this vessel and year was 1,035,152,239 tonne-miles over 19,870 nautical miles.

Reported CO₂ by year

Reported CO₂ in 2022 was 38.8% lower than in 2018, for EU/EEA voyages only.

From 2021 to 2022, emissions fell 33.4% while distance sailed fell 29.3%and CO₂ per nautical mile fell 5.7%.That points mainly to how much the vessel sailed, rather than the other.

Where the 2022 emissions occurred

Observed movementsAIS · Norwegian waters

First seen

25 Aug 2025

Last seen

04 Mar 2026

Days observed

6

Positions

331

Median speed

12.5 kn

Its recorded positions span 58.0°N to 71.0°N and 4.5°E to 19.1°E.

29 hourly points from 331 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.

Sanctions listings

Reproduced from the published source register as of the build date, and not legal advice. A listing attaches to the vessel with this IMO number; ownership and management may have changed since. Check the issuing authority before relying on it.

Verifier history

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 2018–2022, published by the European Commission.
• Vessel particulars: Wikidata (CC0).
• Movements: Norwegian Coastal Administration open AIS extract.
• Sanctions: ofac_sdn.

This page draws on 5 MRV reporting years, an efficiency ranking, 5 of 5 vessel particulars, AIS movements in Norwegian waters, a name history and a sanctions listing. Not found in the sources for this vessel: a licensed photograph 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

• AQUATICA sister · 2005 · 57,243 GT · 16,538 t · 464.1 kg/nm
• KANPUR sister · 2005 · 57,243 GT · 2,473 t · 633.4 kg/nm
• NS CONSUL sister · 2006 · 57,248 GT · 3,523 t · 457.0 kg/nm
• SEABRAVERY sister · 2005 · 57,296 GT · 6,677 t · 445.9 kg/nm
• SEABORN sister · 2005 · 57,296 GT · 2,204 t · 481.8 kg/nm
• SEASCOUT sister · 2004 · 57,301 GT · 18,066 t · 451.8 kg/nm
• ISABELLA sister · 2004 · 57,301 GT · 8,927 t · 466.4 kg/nm
• GOLDEN EAGLE sister · 2004 · 57,301 GT · 14,626 t · 477.8 kg/nm