Helin-Alu

Orbital elements

Semi-major axis

-27,129.68 AU

Eccentricity

1.0002

Inclination

49.29°

Perihelion

4.85 AU

Longitude of ascending node

253.65°

Argument of periapsis

30.79°

Epoch · J2000

JD 2448672.44384 (perihelion)

Orbit class · HYP

Hyperbolic comet

Earth MOID · 1,522.8 LD

3.9128 AU

Orbit quality

Observations used

80

Data arc

534 days

First observed

13 June 1991

Last observed

28 November 1992

Residual RMS

0.78 ″

Solution · Otto Matic

15 April 2021

Visual & observation

Absolute magnitude (H)

10.1

Total magnitude M₁ · K₁ 4.5

10.1

Discovery & classification

Also known as 1991 L4