| Parameter |
Value |
| Designation |
C/1931 P1 (Ryves) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1931-08-25T21:54:00Z |
| Orbit solution date (soln_date, UTC) |
- |
| Obs used |
25 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1931-08-07.0000000 |
| e |
0.99932600 |
| q (au) |
0.074924 |
| a (au) |
111.163205 |
| i (deg) |
169.288100 |
| Ω (om, deg) |
102.277600 |
| ω (w, deg) |
168.145500 |
| M (ma, deg) |
-0.015904 |
Magnitude
Scatter + Global Linear
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| Parameter |
Symbol |
Range |
Description |
| Absolute magnitude at 1 AU from Sun and Earth |
H0 |
-5 to 20 |
Intrinsic brightness of the comet |
| Photometric slope parameter |
n |
2 to 6 |
Rate of brightness change with heliocentric distance |
| Forward scattering asymmetry factor |
gf |
0.8 to 1 |
Degree of forward scattering |
| Backward scattering asymmetry factor |
gb |
-1 to -0.5 |
Degree of backward scattering |
| Partitioning coefficient |
k |
0.8 to 1 |
Ratio between forward/backward scattering contributions |
| Dust-to-gas brightness ratio |
δ90 |
1 to 10 |
Relative contribution of dust scattering to gas emission |
Reference: EPSC-DPS2025-160
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
07:49:23.66 |
+18:28:37.9 |
HIP 38092 |
16.75 |
| 2026-06-01 12:00 |
07:49:24.47 |
+18:28:36.3 |
HIP 38092 |
16.91 |
| 2026-06-02 00:00 |
07:49:25.28 |
+18:28:34.7 |
HIP 38092 |
17.06 |
| 2026-06-02 12:00 |
07:49:26.10 |
+18:28:33.1 |
HIP 38092 |
17.22 |
| 2026-06-03 00:00 |
07:49:26.92 |
+18:28:31.4 |
HIP 38092 |
17.38 |
| 2026-06-03 12:00 |
07:49:27.75 |
+18:28:29.8 |
HIP 38092 |
17.54 |
| 2026-06-04 00:00 |
07:49:28.59 |
+18:28:28.1 |
HIP 38092 |
17.70 |
| 2026-06-04 12:00 |
07:49:29.43 |
+18:28:26.4 |
HIP 38092 |
17.86 |
| 2026-06-05 00:00 |
07:49:30.28 |
+18:28:24.6 |
HIP 38092 |
18.03 |
| 2026-06-05 12:00 |
07:49:31.14 |
+18:28:22.9 |
HIP 38092 |
18.20 |
| 2026-06-06 00:00 |
07:49:32.00 |
+18:28:21.1 |
HIP 38092 |
18.37 |
| 2026-06-06 12:00 |
07:49:32.87 |
+18:28:19.3 |
HIP 38092 |
18.54 |
| 2026-06-07 00:00 |
07:49:33.75 |
+18:28:17.5 |
HIP 38092 |
18.71 |
| 2026-06-07 12:00 |
07:49:34.63 |
+18:28:15.6 |
HIP 38092 |
18.89 |
| 2026-06-08 00:00 |
07:49:35.52 |
+18:28:13.8 |
HIP 38092 |
19.07 |
| 2026-06-08 12:00 |
07:49:36.41 |
+18:28:11.9 |
HIP 38092 |
19.25 |
| 2026-06-09 00:00 |
07:49:37.31 |
+18:28:10.0 |
HIP 38092 |
19.43 |
| 2026-06-09 12:00 |
07:49:38.22 |
+18:28:08.1 |
HIP 38092 |
19.61 |
| 2026-06-10 00:00 |
07:49:39.13 |
+18:28:06.1 |
HIP 38092 |
19.80 |
| 2026-06-10 12:00 |
07:49:40.05 |
+18:28:04.1 |
HIP 38135 |
19.95 |
| 2026-06-11 00:00 |
07:49:40.97 |
+18:28:02.2 |
HIP 38135 |
20.05 |
| 2026-06-11 12:00 |
07:49:41.90 |
+18:28:00.1 |
HIP 38135 |
20.14 |
| 2026-06-12 00:00 |
07:49:42.83 |
+18:27:58.1 |
HIP 38135 |
20.24 |
| 2026-06-12 12:00 |
07:49:43.77 |
+18:27:56.1 |
HIP 38135 |
20.34 |
| 2026-06-13 00:00 |
07:49:44.72 |
+18:27:54.0 |
HIP 38135 |
20.45 |
| 2026-06-13 12:00 |
07:49:45.67 |
+18:27:51.9 |
HIP 38135 |
20.55 |
| 2026-06-14 00:00 |
07:49:46.62 |
+18:27:49.8 |
HIP 38135 |
20.66 |
| 2026-06-14 12:00 |
07:49:47.58 |
+18:27:47.7 |
HIP 38135 |
20.77 |
| 2026-06-15 00:00 |
07:49:48.55 |
+18:27:45.5 |
HIP 38135 |
20.89 |
| 2026-06-15 12:00 |
07:49:49.52 |
+18:27:43.4 |
HIP 38135 |
21.00 |
| 2026-06-16 00:00 |
07:49:50.50 |
+18:27:41.2 |
HIP 38135 |
21.12 |
| 2026-06-16 12:00 |
07:49:51.48 |
+18:27:39.0 |
HIP 38135 |
21.25 |
| 2026-06-17 00:00 |
07:49:52.47 |
+18:27:36.7 |
HIP 38135 |
21.37 |
| 2026-06-17 12:00 |
07:49:53.46 |
+18:27:34.5 |
HIP 38332 |
21.49 |
| 2026-06-18 00:00 |
07:49:54.45 |
+18:27:32.2 |
HIP 38332 |
21.32 |
| 2026-06-18 12:00 |
07:49:55.45 |
+18:27:30.0 |
HIP 38332 |
21.15 |
| 2026-06-19 00:00 |
07:49:56.46 |
+18:27:27.7 |
HIP 38332 |
20.99 |
| 2026-06-19 12:00 |
07:49:57.46 |
+18:27:25.3 |
HIP 38332 |
20.82 |
| 2026-06-20 00:00 |
07:49:58.48 |
+18:27:23.0 |
HIP 38332 |
20.66 |
| 2026-06-20 12:00 |
07:49:59.50 |
+18:27:20.7 |
HIP 38332 |
20.49 |
| 2026-06-21 00:00 |
07:50:00.52 |
+18:27:18.3 |
HIP 38332 |
20.33 |
| 2026-06-21 12:00 |
07:50:01.54 |
+18:27:15.9 |
HIP 38332 |
20.17 |
| 2026-06-22 00:00 |
07:50:02.57 |
+18:27:13.5 |
HIP 38332 |
20.01 |