Table 1.
Revised physical parameters of rings Q1R and Q2R.
| Ring | Detection | Mid-time | r | Wr | pN | τN | Ep | Aτ |
|---|---|---|---|---|---|---|---|---|
| August 9th, 2022 | (km) | (km) | (km) | (km) | ||||
| Q1R- ing | CFHT | 06:31:15.8 (0.1) | 3,994.5 (2.0) | 105.6 (4.4) | 0.0059 (0.0004) | 0.0060 (0.0004) | 0.6 (0.2) | 0.6 (0.2) |
| Gemini (z’) | 06:31:15.72 (0.02) | 3,995.5 (0.4) | 76.5 (0.9) | 0.0051 (0.0002) | 0.0052 (0.0002) | 0.4 (0.1) | 0.4 (0.1) | |
| Gemini (r’) | 06:31:15.69 (0.04) | 3,995.9 (0.6) | 85.5 (1.4) | 0.0066 (0.0006) | 0.0066 (0.0006) | 0.6 (0.2) | 0.6 (0.2) | |
| Q1R- egr | CFHT (a) | 06:38:32.58 (0.07) | 4,123.69 (0.05) | 6.09 (0.11) | 0.17 (0.02) | 0.2 (0.1) | 2.01 (0.03) | 2.41 (0.03) |
| Gemini (z’) (a) | 06:38:32.44 (0.04) | 4,122.88 (0.02) | 5.29 (0.06) | 0.18 (0.02) | 0.26 (0.06) | 1.87 (0.02) | 2.21 (0.02) | |
| Gemini (r’) (a) | 06:38:32.43 (0.04) | 4,122.62 (0.04) | 5.1 (0.1) | 0.17 (0.03) | 0.2 (0.1) | 1.74 (0.03) | 2.03 (0.03) | |
| TUHO | 06:38:37.4 (0.4) | 4,113.6 (7.7) | 78 (18) | 0.06 (0.02) | 0.07 (0.03) | 4.6 (3.5) | 5.2 (4.0) | |
| TAOS II | 06:34:55.7 (0.3) | 4,131.4 (4.5) | 35 (16) | 0.09 (0.04) | 0.12 (0.06) | 3.3 (3.1) | 4.0 (3.9) | |
| Q2R- ing | CFHT | 06:32:43.86 (0.09) | 2,490.6 (1.5) | 16.1 (3.3) | 0.0045 (0.0008) | 0.0045 (0.0008) | 0.07 (0.04) | 0.07 (0.04) |
| Gemini (z’) | 06:32:43.60 (0.04) | 2,493.9 (0.6) | 11.3 (1.1) | 0.0065 (0.0009) | 0.0065 (0.0009) | 0.07 (0.04) | 0.07 (0.04) | |
| Gemini (r’) | n.d. (b) | n.d. (b) | n.d. (b) | n.d. (b) | n.d. (b) | n.d. (b) | n.d. (b) | |
| Q2R- egr | CFHT | 06:37:00.21 (0.02) | 2,540.8 (0.3) | 11.2 (0.4) | 0.0090 (0.0009) | 0.0092 (0.0009) | 0.10 (0.04) | 0.10 (0.04) |
| Gemini (z’) | 06:37:00.08 (0.02) | 2,540.4 (0.3) | 6.8 (0.8) | 0.009 (0.001) | 0.010 (0.001) | 0.06 (0.03) | 0.06 (0.03) | |
| Gemini (r’) | 06:36:59.91 (0.08) | 2,537.7 (1.3) | 9.4 (2.9) | 0.006 (0.002) | 0.007 (0.002) | 0.06 (0.05) | 0.06 (0.05) |
Notes. The normal opacity, pN, and normal optical depth, τN, were calculated from the ring opening angle, B, and position angle, P, on August 9, 2022, derived from the orientation of the body obtained from the 2018–2022 data. The other parameters are: mid-time in UT and the error bars in parentheses given in seconds; r, the radial distance from Quaoar’s center in kilometers; Wr, the radial width in kilometers; Ep and Aτ, the equivalent width and equivalent depth in kilometers, respectively. The terms “ing” and “egr” stand for ingress and egress, respectively, and refer to the fact that the detection occurred before and after the occultation by Quaoar’s main body, respectively. The error bars in parentheses are at the 1σ level. (a)From Lorentzian fit. The width Wr is defined as the FWHM of the τN profile. The Ep and Aτ values were obtained from respective integrals in the ring profile (see Sect. 3 of original file); (b)Not detected.
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