| Parameter |
Value |
| Designation |
P/2022 W1 (Rankin) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2022-09-15T16:21:11.352960Z |
| Orbit solution date (soln_date, UTC) |
2023-02-13T23:14:02Z |
| Obs used |
111 |
| NEO |
- |
| M1 |
15.400 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2022-11-18T06:11:50.553600Z |
| Discovery magnitude (MPC) |
19.59 G |
| Discovery observatory (MPC) |
G96 · University of Arizona Mt. Lemmon Survey |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2022-11-28.0000000 |
| e |
0.51668991 |
| q (au) |
3.367776 |
| a (au) |
6.968147 |
| i (deg) |
13.466326 |
| Ω (om, deg) |
38.816891 |
| ω (w, deg) |
17.777254 |
| M (ma, deg) |
3.928641 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.535 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.535 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.901 |
| k |
1.000 |
| δ90 |
10.000 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-25 00:00 |
12:48:30.45 |
+00:45:24.5 |
HIP 62633 |
23.66 |
| 2026-09-25 12:00 |
12:48:45.39 |
+00:43:34.5 |
HIP 62633 |
19.63 |
| 2026-09-26 00:00 |
12:49:00.35 |
+00:41:44.7 |
HIP 62633 |
15.65 |
| 2026-09-26 12:00 |
12:49:15.31 |
+00:39:54.9 |
HIP 62633 |
11.81 |
| 2026-09-27 00:00 |
12:49:30.28 |
+00:38:05.3 |
HIP 62633 |
8.27 |
| 2026-09-27 12:00 |
12:49:45.26 |
+00:36:15.8 |
HIP 62633 |
5.67 |
| 2026-09-28 00:00 |
12:50:00.25 |
+00:34:26.4 |
HIP 62633 |
5.53 |
| 2026-09-28 12:00 |
12:50:15.25 |
+00:32:37.1 |
HIP 62633 |
7.98 |
| 2026-09-29 00:00 |
12:50:30.26 |
+00:30:47.9 |
HIP 62633 |
11.47 |
| 2026-09-29 12:00 |
12:50:45.28 |
+00:28:58.9 |
HIP 62759 |
13.48 |
| 2026-09-30 00:00 |
12:51:00.30 |
+00:27:10.0 |
HIP 62759 |
10.05 |
| 2026-09-30 12:00 |
12:51:15.33 |
+00:25:21.2 |
HIP 62759 |
7.41 |
| 2026-10-01 00:00 |
12:51:30.37 |
+00:23:32.5 |
HIP 62759 |
6.60 |
| 2026-10-01 12:00 |
12:51:45.41 |
+00:21:44.0 |
HIP 62759 |
8.19 |
| 2026-10-02 00:00 |
12:52:00.46 |
+00:19:55.6 |
HIP 62759 |
11.19 |
| 2026-10-02 12:00 |
12:52:15.51 |
+00:18:07.4 |
HIP 62776 |
14.29 |
| 2026-10-03 00:00 |
12:52:30.57 |
+00:16:19.3 |
HIP 62776 |
14.80 |
| 2026-10-03 12:00 |
12:52:45.63 |
+00:14:31.4 |
HIP 62776 |
16.39 |
| 2026-10-04 00:00 |
12:53:00.70 |
+00:12:43.6 |
HIP 62776 |
18.80 |
| 2026-10-04 12:00 |
12:53:15.76 |
+00:10:56.0 |
HIP 62776 |
21.74 |
| 2026-10-05 00:00 |
12:53:30.83 |
+00:09:08.5 |
HIP 62776 |
25.04 |
| 2026-10-05 12:00 |
12:53:45.90 |
+00:07:21.2 |
HIP 63093 |
28.42 |
| 2026-10-06 00:00 |
12:54:00.97 |
+00:05:34.1 |
HIP 63093 |
24.47 |
| 2026-10-06 12:00 |
12:54:16.05 |
+00:03:47.2 |
HIP 63093 |
20.60 |
| 2026-10-07 00:00 |
12:54:31.12 |
+00:02:00.4 |
HIP 63093 |
16.88 |
| 2026-10-07 12:00 |
12:54:46.19 |
+00:00:13.8 |
HIP 63093 |
13.42 |
| 2026-10-08 00:00 |
12:55:01.26 |
-00:01:32.6 |
HIP 63093 |
10.49 |
| 2026-10-08 12:00 |
12:55:16.33 |
-00:03:18.9 |
HIP 63093 |
8.63 |
| 2026-10-09 00:00 |
12:55:31.39 |
-00:05:04.9 |
HIP 63093 |
8.58 |
| 2026-10-09 12:00 |
12:55:46.46 |
-00:06:50.7 |
HIP 63093 |
10.36 |
| 2026-10-10 00:00 |
12:56:01.51 |
-00:08:36.4 |
HIP 63093 |
13.25 |
| 2026-10-10 12:00 |
12:56:16.57 |
-00:10:21.8 |
HIP 63093 |
16.68 |
| 2026-10-11 00:00 |
12:56:31.62 |
-00:12:07.0 |
HIP 63093 |
20.37 |
| 2026-10-11 12:00 |
12:56:46.66 |
-00:13:52.0 |
HIP 63093 |
24.21 |
| 2026-10-12 00:00 |
12:57:01.70 |
-00:15:36.8 |
HIP 63093 |
28.14 |
| 2026-10-12 12:00 |
12:57:16.73 |
-00:17:21.4 |
HIP 63373 |
28.91 |
| 2026-10-13 00:00 |
12:57:31.75 |
-00:19:05.8 |
HIP 63373 |
24.82 |
| 2026-10-13 12:00 |
12:57:46.76 |
-00:20:49.9 |
HIP 63373 |
20.76 |
| 2026-10-14 00:00 |
12:58:01.77 |
-00:22:33.8 |
HIP 63373 |
16.72 |
| 2026-10-14 12:00 |
12:58:16.77 |
-00:24:17.5 |
HIP 63373 |
12.75 |
| 2026-10-15 00:00 |
12:58:31.75 |
-00:26:00.9 |
HIP 63373 |
8.93 |
| 2026-10-15 12:00 |
12:58:46.73 |
-00:27:44.1 |
HIP 63373 |
5.57 |
| 2026-10-16 00:00 |
12:59:01.69 |
-00:29:27.1 |
HIP 63373 |
4.02 |