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The siriometer is a rarely used and an obsolete astronomical unit of length, defined to be equal to about one million astronomical units (au). One siriometer is approximately 149.6 petametres; 4.848 parsecs; 15.81 light-years. It's about twice the distance from Earth to the star Sirius. The unit was proposed in 1911 by Carl V. L. Charlier who used the symbol "sir." Others have suggested denoting the unit with the symbol 'Sm'.

The siriometer never gained widespread usage. The first General Assembly of the International Astronomical Union in 1922 adopted the parsec as the standard unit of stellar distances, which simplified the definition of absolute magnitude. Use of the siriometer seems to have disappeared from the astronomical literature by c.1930. Professional astronomers use the parsec as their primary unit of distances larger than the Solar System.

Symbol/abbreviation: sir
Unit of: LENGTH
LENGTH's base unit: meters (SI Unit)
In relation to the base unit (meters), 1 Siriometer = 1.496E+17 meters.

Conversion table
1 Siriometer (sir) to all length units

1 sir= 8.2456692913191E+19 agate [typography] (agate)
1 sir= 2.5194601349326E+17 alens (aln)
1 sir= 1.496E+27 angstroms (Å)
1 sir= 1000014.2334914 astronomical unit (au)
1 sir= 1.496E+35 attometers (am)
1 sir= 1.7669291338583E+19 barleycorns (bcorn)
1 sir= 1.496E+29 bicrons (μμ)
1 sir= 1.8591426071741E+15 blocks (bl)
1 sir= 2.8270314091504E+27 bohr radius (Bohr)
1 sir= 8.0725928995718E+14 cable length uk (cbl[UK])
1 sir= 6.816856226305E+14 cable length us (cbl[US])
1 sir= 5.8897637795276E+20 calibers (cal)
1 sir= 5.8897637795276E+20 centiinch (cin)
1 sir= 1.496E+19 centimeters (cm)
1 sir= 7.4365704286964E+15 chains (ch)
1 sir= 3.2720909886264E+17 cubits (cbt)
1 sir= 1.496E+16 decameters (dam)
1 sir= 1.496E+18 decimeters (dm)
1 sir= 3.9790173647456E+20 didot points (didot point)
1 sir= 7.8530183727034E+18 digits (digit)
1 sir= 3740000000 earth circumference (Ec)
1 sir= 389175914.79753 earth to moon distance (EM d)
1 sir= 1.3088363954506E+17 ells (eel)
1 sir= 3.5471102716916E+19 ems (EM)
1 sir= 0.1496 exameters (Em)
1 sir= 8.1802274715661E+16 fathoms (fath)
1 sir= 4.9081364829396E+17 feet (ft)
1 sir= 1.496E+32 femtometers (fm)
1 sir= 1.496E+32 fermi (fermi)
1 sir= 1.3088363954506E+18 finger cloth (finer)
1 sir= 6.7311586051744E+18 fingerbreadth (fb)
1 sir= 4.7628143903216E+17 fods (fod)
1 sir= 1.6360454943132E+15 football field length [US] (fbf[US])
1 sir= 7.4365704286964E+14 furlongs (fur)
1 sir= 149600000 gigameters (Gm)
1 sir= 4.8571428571429E+15 greek plethron (pleth)
1 sir= 8.0864864864865E+14 greek stadion (std)
1 sir= 1.4724409448819E+18 hands (h)
1 sir= 1.496E+15 hectometers (hm)
1 sir= 1.496E+22 himetrics (hiMetric)
1 sir= 6.2333333333333E+16 horse length (hl)
1 sir= 7.8882823488757E+16 hvats (hvat)
1 sir= 5.8897637795276E+18 inches (in)
1 sir= 1.496E+14 kilometers (km)
1 sir= 0.004847699287103 kiloparsecs (kpc)
1 sir= 5776.0617760618 light days (ld)
1 sir= 138646.8952734 light hours (lh)
1 sir= 8315730.9616454 light minutes (lmin)
1 sir= 192.51061639429 light months (lm)
1 sir= 498999332.88859 light seconds (ls)
1 sir= 15.812281999789 light years (ly)
1 sir= 7.1238095238095E+19 lines (l)
1 sir= 7.4365555555483E+17 links (li)
1 sir= 389175914.79753 lunar distance (LD)
1 sir= 149600000000 megameters (Mm)
1 sir= 1.496E+17 meters (m)
1 sir= 4.9866666666667E+17 metric foot (mf)
1 sir= 5.8897637795276E+24 microinches (μin)
1 sir= 1.496E+23 micrometers (μm)
1 sir= 1.496E+29 micromicrons (μμm)
1 sir= 92957130358705 miles (mi)
1 sir= 1.496E+20 millimeters (mm)
1 sir= 5.8897637795276E+21 mils (mil)
1 sir= 14960000000000 myriameters (Mym)
1 sir= 2.6176727909011E+18 nails cloth (nail)
1 sir= 1.496E+26 nanometers (nm)
1 sir= 26925845932325 nautical leagues (Nl)
1 sir= 80777537796976 nautical miles (NM)
1 sir= 1.9632545931759E+17 paces (pace)
1 sir= 1.9632545931759E+18 palms (palm)
1 sir= 4.8482058170088 parsecs (pc)
1 sir= 2.9746281714786E+16 perch (perch)
1 sir= 149.6 petameters (Pm)
1 sir= 3.5338582704991E+19 picas (p)
1 sir= 1.496E+29 picometers (pm)
1 sir= 5.6541739406833E+20 pixels (PX)
1 sir= 9.35E+51 planck length (pl)
1 sir= 4.2406272499986E+20 points (pt)
1 sir= 2.9746281714786E+16 poles (pole)
1 sir= 3.3655793025872E+18 rack unit (ru)
1 sir= 3.5338587129271E+19 rems (rem)
1 sir= 2.9746281714786E+16 rods (rd)
1 sir= 4.2140845070423E+15 roman actus (actus)
1 sir= 2.4540682414698E+16 ropes (rope)
1 sir= 14960000000000 scandinavian miles (mil[Scandinavian])
1 sir= 1 siriometer (sir)
1 sir= 6.5441819772528E+17 spans (span)
1 sir= 149600 terameters (Tm)
1 sir= 5.8897637795276E+21 thou (th)
1 sir= 8.4812064175974E+21 twips (twip)
1 sir= 1.7274826789838E+17 varas [Argentina] (vr[Argentina])
1 sir= 1.784773325675E+17 varas [California] (vr[California])
1 sir= 1.7314814814815E+17 varas [Latin America] (vr[Latin])
1 sir= 1.785160258705E+17 varas [Mexico] (vr[Mexico])
1 sir= 1.789687761694E+17 varas [Spanish] (vr[Spanish])
1 sir= 1.7669221774717E+17 varas [Texas] (vr[Texas])
1 sir= 1.4023247094113E+14 versts (vst)
1 sir= 1.4930080119441E+30 x unit (xu)
1 sir= 1.6360454943132E+17 yards (yd)
1 sir= 1.496E+41 yoctometers (ym)
1 sir= 1.496E-7 yottameters (Ym)
1 sir= 1.496E+38 zeptometers (zm)
1 sir= 0.0001496 zettameters (Zm)
1 sir= 5.8897637795276E+18 zolls (zoll)