Table 3.
Radiant positions, speeds, and orbital elements of Perseid meteors found in 5 studies compared with median values computed in this work and the orbit of the parent comet.
| RA | Dec | Vg | a | q | e | i | ω | Node | N | |
|---|---|---|---|---|---|---|---|---|---|---|
| Jenniskens et al. | 48.2 | +58.1 | 59.1 | 9.57 | 0.949 | 0.950 | 113.1 | 150.4 | 139.3 | 4367 |
| SonotaCo | 47.2 | +57.8 | 58.7 | 3524 | ||||||
| Jopek et al. | 47.3 | +58.2 | 59.0 | … | 0.948 | 0.951 | 112.7 | 150.3 | 139.4 | 33 |
| DMSa | 48.3 | +58.0 | 59.38 | 71.4 | 0.953 | … | 113.22 | 151.3 | 140.19 | 87 |
| Kresák & Poruban | 46.8 | +57.7 | 59.49 | 24.0 | 0.949 | 0.960 | 113.0 | 150.4 | 139.7 | … |
| This study | 46.84 | +58.08 | 59.58 | 2.69 | 0.963 | 0.953 | 113.5 | 153.8 | 139.77 | 71 |
| (median error) | 0.72 | 0.21 | 0.88 | 3.09 | 0.01 | 0.06 | 0.8 | 2.8 | 5 × 10−5 | |
| 109P (parent comet) | 45.8 | +57.7 | 59.41 | 26.092 | 0.960 | 0.963 | 113.45 | 152.98 | 139.38 | |
Notes. Increments of 0.86∘ and 0.51∘ have been added to the median radiant position in RA and Dec to account for radiant shift (Jenniskens 2006) to the location predicted for 13 August at 7:45 UT. Orbital elements in epoch J2000; symbols: a = semi-major axis (AU), q = perihelion distance (AU), e = eccentricity), i = inclination (∘), ω = argument of perihelion (∘), Node = ascending node (∘), N = number of observed meteors.
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