| 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 · 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) |
| 2026-03-26 00:00 |
12:33:31.48 |
+05:50:06.2 |
HIP 61261 |
4.90 |
| 2026-03-26 12:00 |
12:33:19.20 |
+05:51:08.0 |
HIP 61261 |
4.29 |
| 2026-03-27 00:00 |
12:33:06.92 |
+05:52:09.4 |
HIP 61261 |
5.79 |
| 2026-03-27 12:00 |
12:32:54.63 |
+05:53:10.5 |
HIP 61261 |
8.32 |
| 2026-03-28 00:00 |
12:32:42.34 |
+05:54:11.1 |
HIP 61261 |
11.21 |
| 2026-03-28 12:00 |
12:32:30.06 |
+05:55:11.3 |
HIP 61261 |
14.24 |
| 2026-03-29 00:00 |
12:32:17.77 |
+05:56:11.1 |
HIP 61149 |
15.12 |
| 2026-03-29 12:00 |
12:32:05.50 |
+05:57:10.5 |
HIP 61149 |
15.01 |
| 2026-03-30 00:00 |
12:31:53.22 |
+05:58:09.5 |
HIP 61149 |
15.57 |
| 2026-03-30 12:00 |
12:31:40.96 |
+05:59:08.0 |
HIP 61149 |
16.73 |
| 2026-03-31 00:00 |
12:31:28.71 |
+06:00:06.0 |
HIP 61149 |
18.37 |
| 2026-03-31 12:00 |
12:31:16.46 |
+06:01:03.6 |
HIP 61004 |
18.28 |
| 2026-04-01 00:00 |
12:31:04.23 |
+06:02:00.8 |
HIP 61004 |
16.18 |
| 2026-04-01 12:00 |
12:30:52.01 |
+06:02:57.4 |
HIP 61004 |
14.48 |
| 2026-04-02 00:00 |
12:30:39.81 |
+06:03:53.6 |
HIP 61004 |
13.32 |
| 2026-04-02 12:00 |
12:30:27.63 |
+06:04:49.3 |
HIP 61004 |
12.86 |
| 2026-04-03 00:00 |
12:30:15.46 |
+06:05:44.5 |
HIP 61004 |
13.16 |
| 2026-04-03 12:00 |
12:30:03.32 |
+06:06:39.1 |
HIP 61004 |
14.17 |
| 2026-04-04 00:00 |
12:29:51.20 |
+06:07:33.3 |
HIP 60915 |
15.39 |
| 2026-04-04 12:00 |
12:29:39.10 |
+06:08:26.9 |
HIP 60915 |
13.92 |
| 2026-04-05 00:00 |
12:29:27.02 |
+06:09:20.0 |
HIP 60915 |
13.04 |
| 2026-04-05 12:00 |
12:29:14.98 |
+06:10:12.6 |
HIP 60915 |
12.87 |
| 2026-04-06 00:00 |
12:29:02.96 |
+06:11:04.6 |
HIP 60915 |
13.44 |
| 2026-04-06 12:00 |
12:28:50.97 |
+06:11:56.1 |
HIP 60915 |
14.65 |
| 2026-04-07 00:00 |
12:28:39.01 |
+06:12:47.0 |
HIP 60800 |
15.19 |
| 2026-04-07 12:00 |
12:28:27.08 |
+06:13:37.3 |
HIP 60800 |
12.59 |
| 2026-04-08 00:00 |
12:28:15.19 |
+06:14:27.0 |
HIP 60800 |
10.26 |
| 2026-04-08 12:00 |
12:28:03.34 |
+06:15:16.2 |
HIP 60800 |
8.42 |
| 2026-04-09 00:00 |
12:27:51.52 |
+06:16:04.7 |
HIP 60800 |
7.43 |
| 2026-04-09 12:00 |
12:27:39.74 |
+06:16:52.7 |
HIP 60800 |
7.61 |
| 2026-04-10 00:00 |
12:27:28.00 |
+06:17:40.0 |
HIP 60800 |
8.88 |
| 2026-04-10 12:00 |
12:27:16.30 |
+06:18:26.7 |
HIP 60800 |
10.85 |
| 2026-04-11 00:00 |
12:27:04.65 |
+06:19:12.8 |
HIP 60800 |
13.20 |
| 2026-04-11 12:00 |
12:26:53.04 |
+06:19:58.3 |
HIP 60800 |
15.76 |
| 2026-04-12 00:00 |
12:26:41.48 |
+06:20:43.1 |
HIP 60800 |
18.43 |
| 2026-04-12 12:00 |
12:26:29.97 |
+06:21:27.3 |
HIP 60800 |
21.16 |
| 2026-04-13 00:00 |
12:26:18.50 |
+06:22:10.8 |
HIP 60562 |
21.44 |
| 2026-04-13 12:00 |
12:26:07.09 |
+06:22:53.7 |
HIP 60562 |
18.63 |
| 2026-04-14 00:00 |
12:25:55.73 |
+06:23:35.9 |
HIP 60562 |
15.88 |
| 2026-04-14 12:00 |
12:25:44.42 |
+06:24:17.4 |
HIP 60562 |
13.20 |
| 2026-04-15 00:00 |
12:25:33.17 |
+06:24:58.3 |
HIP 60562 |
10.65 |
| 2026-04-15 12:00 |
12:25:21.98 |
+06:25:38.4 |
HIP 60562 |
8.32 |
| 2026-04-16 00:00 |
12:25:10.84 |
+06:26:17.9 |
HIP 60562 |
6.44 |