| 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) |
| 2026-07-29 00:00 |
12:23:17.56 |
+04:14:13.3 |
HIP 60533 |
19.54 |
| 2026-07-29 12:00 |
12:23:27.54 |
+04:12:35.3 |
HIP 60533 |
17.78 |
| 2026-07-30 00:00 |
12:23:37.58 |
+04:10:56.9 |
HIP 60533 |
16.36 |
| 2026-07-30 12:00 |
12:23:47.71 |
+04:09:18.3 |
HIP 60501 |
14.75 |
| 2026-07-31 00:00 |
12:23:57.90 |
+04:07:39.4 |
HIP 60501 |
12.31 |
| 2026-07-31 12:00 |
12:24:08.16 |
+04:06:00.1 |
HIP 60501 |
10.19 |
| 2026-08-01 00:00 |
12:24:18.50 |
+04:04:20.6 |
HIP 60501 |
8.64 |
| 2026-08-01 12:00 |
12:24:28.91 |
+04:02:40.7 |
HIP 60501 |
8.02 |
| 2026-08-02 00:00 |
12:24:39.39 |
+04:01:00.6 |
HIP 60501 |
8.56 |
| 2026-08-02 12:00 |
12:24:49.93 |
+03:59:20.2 |
HIP 60501 |
10.08 |
| 2026-08-03 00:00 |
12:25:00.55 |
+03:57:39.5 |
HIP 60501 |
12.25 |
| 2026-08-03 12:00 |
12:25:11.24 |
+03:55:58.5 |
HIP 60501 |
14.78 |
| 2026-08-04 00:00 |
12:25:21.99 |
+03:54:17.3 |
HIP 60501 |
17.53 |
| 2026-08-04 12:00 |
12:25:32.81 |
+03:52:35.7 |
HIP 60655 |
20.15 |
| 2026-08-05 00:00 |
12:25:43.70 |
+03:50:53.9 |
HIP 60655 |
21.27 |
| 2026-08-05 12:00 |
12:25:54.66 |
+03:49:11.8 |
HIP 60655 |
22.79 |
| 2026-08-06 00:00 |
12:26:05.68 |
+03:47:29.5 |
HIP 60655 |
24.64 |
| 2026-08-06 12:00 |
12:26:16.77 |
+03:45:46.9 |
HIP 60655 |
26.77 |
| 2026-08-07 00:00 |
12:26:27.93 |
+03:44:04.0 |
HIP 60843 |
27.15 |
| 2026-08-07 12:00 |
12:26:39.15 |
+03:42:20.9 |
HIP 60843 |
24.26 |
| 2026-08-08 00:00 |
12:26:50.43 |
+03:40:37.5 |
HIP 60843 |
21.47 |
| 2026-08-08 12:00 |
12:27:01.78 |
+03:38:53.9 |
HIP 60843 |
18.84 |
| 2026-08-09 00:00 |
12:27:13.20 |
+03:37:10.1 |
HIP 60843 |
16.44 |
| 2026-08-09 12:00 |
12:27:24.67 |
+03:35:26.0 |
HIP 60843 |
14.40 |
| 2026-08-10 00:00 |
12:27:36.21 |
+03:33:41.6 |
HIP 60843 |
12.90 |
| 2026-08-10 12:00 |
12:27:47.81 |
+03:31:57.1 |
HIP 60843 |
12.18 |
| 2026-08-11 00:00 |
12:27:59.47 |
+03:30:12.3 |
HIP 60843 |
12.36 |
| 2026-08-11 12:00 |
12:28:11.19 |
+03:28:27.3 |
HIP 60847 |
12.29 |
| 2026-08-12 00:00 |
12:28:22.98 |
+03:26:42.0 |
HIP 60847 |
10.55 |
| 2026-08-12 12:00 |
12:28:34.82 |
+03:24:56.6 |
HIP 60847 |
9.75 |
| 2026-08-13 00:00 |
12:28:46.72 |
+03:23:10.9 |
HIP 60847 |
10.13 |
| 2026-08-13 12:00 |
12:28:58.68 |
+03:21:25.0 |
HIP 60847 |
11.58 |
| 2026-08-14 00:00 |
12:29:10.70 |
+03:19:39.0 |
HIP 60847 |
13.79 |
| 2026-08-14 12:00 |
12:29:22.78 |
+03:17:52.7 |
HIP 60847 |
16.46 |
| 2026-08-15 00:00 |
12:29:34.91 |
+03:16:06.2 |
HIP 60847 |
19.41 |
| 2026-08-15 12:00 |
12:29:47.10 |
+03:14:19.6 |
HIP 61037 |
20.03 |
| 2026-08-16 00:00 |
12:29:59.34 |
+03:12:32.7 |
HIP 61037 |
19.97 |
| 2026-08-16 12:00 |
12:30:11.64 |
+03:10:45.7 |
HIP 61037 |
20.54 |
| 2026-08-17 00:00 |
12:30:23.99 |
+03:08:58.5 |
HIP 61037 |
21.68 |
| 2026-08-17 12:00 |
12:30:36.40 |
+03:07:11.2 |
HIP 61037 |
23.31 |
| 2026-08-18 00:00 |
12:30:48.86 |
+03:05:23.6 |
HIP 61037 |
25.36 |
| 2026-08-18 12:00 |
12:31:01.37 |
+03:03:35.9 |
HIP 61037 |
27.72 |
| 2026-08-19 00:00 |
12:31:13.94 |
+03:01:48.0 |
HIP 61037 |
30.34 |