| Parameter |
Value |
| Designation |
P/2022 R4 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2022-07-10T09:08:14.683200Z |
| Orbit solution date (soln_date, UTC) |
2022-12-08T23:43:20Z |
| Obs used |
44 |
| NEO |
- |
| M1 |
18.500 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2022-09-02T13:50:22.128000Z |
| Discovery magnitude (MPC) |
21.38 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2022-10-02.0000000 |
| e |
0.49035777 |
| q (au) |
1.955577 |
| a (au) |
3.837156 |
| i (deg) |
21.021791 |
| Ω (om, deg) |
176.624038 |
| ω (w, deg) |
197.431178 |
| M (ma, deg) |
10.964688 |
Magnitude
Scatter + Global Linear
$$
M_a = (18.847 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
18.847 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
0.800 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
13:01:14.43 |
+01:08:27.9 |
HIP 63560 |
23.10 |
| 2026-03-26 12:00 |
13:00:59.29 |
+01:10:52.8 |
HIP 63560 |
21.78 |
| 2026-03-27 00:00 |
13:00:44.09 |
+01:13:17.6 |
HIP 63560 |
21.34 |
| 2026-03-27 12:00 |
13:00:28.85 |
+01:15:42.2 |
HIP 63560 |
21.85 |
| 2026-03-28 00:00 |
13:00:13.57 |
+01:18:06.7 |
HIP 63560 |
23.25 |
| 2026-03-28 12:00 |
12:59:58.26 |
+01:20:31.0 |
HIP 63560 |
25.40 |
| 2026-03-29 00:00 |
12:59:42.91 |
+01:22:55.1 |
HIP 63560 |
28.12 |
| 2026-03-29 12:00 |
12:59:27.52 |
+01:25:19.0 |
HIP 63235 |
30.30 |
| 2026-03-30 00:00 |
12:59:12.10 |
+01:27:42.6 |
HIP 63235 |
26.52 |
| 2026-03-30 12:00 |
12:58:56.66 |
+01:30:06.0 |
HIP 63235 |
23.01 |
| 2026-03-31 00:00 |
12:58:41.19 |
+01:32:29.1 |
HIP 63235 |
19.91 |
| 2026-03-31 12:00 |
12:58:25.69 |
+01:34:52.0 |
HIP 63235 |
17.45 |
| 2026-04-01 00:00 |
12:58:10.17 |
+01:37:14.5 |
HIP 63235 |
15.93 |
| 2026-04-01 12:00 |
12:57:54.64 |
+01:39:36.8 |
HIP 63235 |
15.63 |
| 2026-04-02 00:00 |
12:57:39.08 |
+01:41:58.7 |
HIP 63235 |
16.61 |
| 2026-04-02 12:00 |
12:57:23.51 |
+01:44:20.2 |
HIP 63235 |
18.67 |
| 2026-04-03 00:00 |
12:57:07.93 |
+01:46:41.4 |
HIP 63235 |
21.51 |
| 2026-04-03 12:00 |
12:56:52.34 |
+01:49:02.2 |
HIP 63235 |
24.85 |
| 2026-04-04 00:00 |
12:56:36.74 |
+01:51:22.5 |
HIP 63235 |
28.53 |
| 2026-04-04 12:00 |
12:56:21.13 |
+01:53:42.5 |
HIP 63052 |
30.46 |
| 2026-04-05 00:00 |
12:56:05.53 |
+01:56:02.0 |
HIP 63037 |
28.59 |
| 2026-04-05 12:00 |
12:55:49.92 |
+01:58:21.1 |
HIP 63037 |
24.60 |
| 2026-04-06 00:00 |
12:55:34.31 |
+02:00:39.7 |
HIP 63037 |
20.83 |
| 2026-04-06 12:00 |
12:55:18.71 |
+02:02:57.8 |
HIP 63037 |
17.43 |
| 2026-04-07 00:00 |
12:55:03.11 |
+02:05:15.4 |
HIP 63037 |
14.68 |
| 2026-04-07 12:00 |
12:54:47.53 |
+02:07:32.5 |
HIP 63037 |
12.96 |
| 2026-04-08 00:00 |
12:54:31.95 |
+02:09:49.1 |
HIP 63037 |
12.70 |
| 2026-04-08 12:00 |
12:54:16.39 |
+02:12:05.1 |
HIP 63037 |
13.98 |
| 2026-04-09 00:00 |
12:54:00.84 |
+02:14:20.5 |
HIP 63037 |
16.43 |
| 2026-04-09 12:00 |
12:53:45.31 |
+02:16:35.3 |
HIP 62849 |
16.36 |
| 2026-04-10 00:00 |
12:53:29.80 |
+02:18:49.6 |
HIP 62849 |
15.09 |
| 2026-04-10 12:00 |
12:53:14.32 |
+02:21:03.2 |
HIP 62849 |
15.09 |
| 2026-04-11 00:00 |
12:52:58.86 |
+02:23:16.2 |
HIP 62849 |
16.34 |
| 2026-04-11 12:00 |
12:52:43.43 |
+02:25:28.5 |
HIP 62849 |
18.59 |
| 2026-04-12 00:00 |
12:52:28.03 |
+02:27:40.1 |
HIP 62849 |
21.51 |
| 2026-04-12 12:00 |
12:52:12.66 |
+02:29:51.1 |
HIP 62924 |
24.56 |
| 2026-04-13 00:00 |
12:51:57.33 |
+02:32:01.4 |
HIP 62924 |
27.41 |
| 2026-04-13 12:00 |
12:51:42.03 |
+02:34:10.9 |
HIP 62757 |
29.25 |
| 2026-04-14 00:00 |
12:51:26.78 |
+02:36:19.7 |
HIP 62757 |
27.19 |
| 2026-04-14 12:00 |
12:51:11.56 |
+02:38:27.8 |
HIP 62757 |
25.73 |
| 2026-04-15 00:00 |
12:50:56.40 |
+02:40:35.1 |
HIP 62757 |
24.96 |
| 2026-04-15 12:00 |
12:50:41.28 |
+02:42:41.6 |
HIP 62757 |
24.94 |
| 2026-04-16 00:00 |
12:50:26.20 |
+02:44:47.4 |
HIP 62757 |
25.66 |