Vicinity of (7) Iris in the ap vs. sin Ip space of proper orbital elements. The eccentricity range is ep ∈ (0.162;0.262). Asteroids with albedo within ± 0.1 of the Iris value (pV = 0.252), are plotted in yellow, with symbol size proportional to the body diameter. Asteroids with unknown albedo are plotted as gray dots. The family visible at sin Ip ≐ 0.09 is related to the dark C-type asteroid (163) Erigone. The dashed ellipse corresponds to the escape velocity from Iris, vesc ≐ 130 m s−1, converted to orbital elements using the Gauss equations. This velocity was computed for true anomaly f = 180° and argument of perihelion ω = 0°.
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