Astor

At 20,704 gross tons, Astor is the 26,231st largest of the 84,014 vessels in this registry that report a tonnage. The median across that set is 5,994 GT, so this hull is about 3.5 times the typical vessel on record here. The largest measures 499,167 GT.

Among the 665 cruise ships held here, it ranks 329th by tonnage — larger than 35% of that group. Their median tonnage is 43,009 GT, and the largest tenth begin at 143,289 GT. The flag most often flown by this group is The Bahamas (133 ships). The yard that appears most often against it is Fincantieri, with 112 hulls on record.

Astor was built in 1987, making it 39 years old. It is one of 819 hulls in this registry delivered that year, a cohort whose median tonnage is 1,937 GT; within it this ship is the 168th largest. Across the whole of the 1980s the registry holds 13,213 vessels, median 3,004 GT. The median build year across the entire registry is 1995.

The registry attributes 210 vessels to Howaldtswerke-Deutsche Werft, with a median tonnage of 30,285 GT, delivered between 1905 and 2010. See the rest of that yard’s output.

At 176.3 m overall, Astor is 21.9 m shorter than the 198.1 m median for cruise ships on record, with a beam of 22.6 m and a draft of 6.1 m.

IMO numbers are issued in broadly chronological blocks. Within 500 either side of 8506373 this registry holds 50 other vessels, whose median build year is 1986 and which range from 1985 to 1991. That places this hull’s registration in the same part of the series, consistent with its recorded build year of 1987.

Its IMO number, 8506373, carries its own check digit. The first six digits are weighted seven down to two and summed — 8×7 + 5×6 + 0×5 + 6×4 + 3×3 + 7×2 = 133 — and the last digit of that total, 3, must equal the seventh digit, 3. It does, so this number is well formed.