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| 1899 | 1 | C: | Color excess E(B-V) = +0.07. |
| | 1 | D: | AB fixed. B is B7IV; vsini 50k/s. |
| | 1 | DYN: | 0.005". |
| | 1 | G: | Iota Ori cluster; Ori OB1c4; sword of Orion; HII region. |
| | 1 | N: | Nair al Saif; Hatysa in Becvar. |
| | 1 | RV: | ADS 4193A, mass ejection vel. up to 1600k/s. ADS 4193B, +16k/s. |
| | 1 | S: | Enhanced ultraviolet emission. Helium weak. Interstellar Lyman alpha absorption observed by AEROBEE rocket. |
| | 2 | S: | Iota Ori B is a helium weak star. Helium deficient by factor of 10 relative to standard stars. P and Ga enormously |
| | 3 | S: | enhanced. uv 1240 absorption strong; weak 1548. |
| | 1 | SB: | ADS 4193A, 29.1351d, K 115.2k/s, V0 +26.6k/s, msin3i 15.7, asini 30.0. |
| | 1 | VAR: | Component B is NSV 2334, 7.4V. |
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