| 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) |
| 2026-05-12 00:00 |
12:39:21.72 |
+04:10:40.4 |
HIP 61628 |
23.37 |
| 2026-05-12 12:00 |
12:39:12.03 |
+04:11:49.0 |
HIP 61628 |
20.74 |
| 2026-05-13 00:00 |
12:39:02.48 |
+04:12:56.4 |
HIP 61628 |
18.15 |
| 2026-05-13 12:00 |
12:38:53.07 |
+04:14:02.5 |
HIP 61628 |
15.61 |
| 2026-05-14 00:00 |
12:38:43.81 |
+04:15:07.4 |
HIP 61628 |
13.14 |
| 2026-05-14 12:00 |
12:38:34.68 |
+04:16:11.0 |
HIP 61628 |
10.74 |
| 2026-05-15 00:00 |
12:38:25.71 |
+04:17:13.3 |
HIP 61628 |
8.44 |
| 2026-05-15 12:00 |
12:38:16.88 |
+04:18:14.4 |
HIP 61628 |
6.31 |
| 2026-05-16 00:00 |
12:38:08.19 |
+04:19:14.2 |
HIP 61628 |
4.50 |
| 2026-05-16 12:00 |
12:37:59.66 |
+04:20:12.7 |
HIP 61628 |
3.49 |
| 2026-05-17 00:00 |
12:37:51.27 |
+04:21:09.9 |
HIP 61628 |
3.85 |
| 2026-05-17 12:00 |
12:37:43.04 |
+04:22:05.9 |
HIP 61628 |
5.26 |
| 2026-05-18 00:00 |
12:37:34.95 |
+04:23:00.6 |
HIP 61628 |
7.08 |
| 2026-05-18 12:00 |
12:37:27.02 |
+04:23:54.1 |
HIP 61628 |
9.03 |
| 2026-05-19 00:00 |
12:37:19.24 |
+04:24:46.2 |
HIP 61628 |
11.02 |
| 2026-05-19 12:00 |
12:37:11.61 |
+04:25:37.1 |
HIP 61628 |
13.02 |
| 2026-05-20 00:00 |
12:37:04.14 |
+04:26:26.7 |
HIP 61628 |
14.99 |
| 2026-05-20 12:00 |
12:36:56.82 |
+04:27:15.0 |
HIP 61628 |
16.93 |
| 2026-05-21 00:00 |
12:36:49.66 |
+04:28:02.1 |
HIP 61628 |
18.84 |
| 2026-05-21 12:00 |
12:36:42.65 |
+04:28:47.9 |
HIP 61628 |
20.72 |
| 2026-05-22 00:00 |
12:36:35.80 |
+04:29:32.4 |
HIP 61628 |
22.55 |
| 2026-05-22 12:00 |
12:36:29.10 |
+04:30:15.6 |
HIP 61628 |
24.35 |
| 2026-05-23 00:00 |
12:36:22.56 |
+04:30:57.6 |
HIP 61628 |
26.10 |
| 2026-05-23 12:00 |
12:36:16.18 |
+04:31:38.3 |
HIP 61628 |
27.81 |
| 2026-05-24 00:00 |
12:36:09.96 |
+04:32:17.8 |
HIP 61628 |
29.48 |
| 2026-05-24 12:00 |
12:36:03.90 |
+04:32:55.9 |
HIP 61628 |
31.11 |
| 2026-05-25 00:00 |
12:35:57.99 |
+04:33:32.9 |
HIP 61628 |
32.69 |
| 2026-05-25 12:00 |
12:35:52.24 |
+04:34:08.5 |
HIP 61417 |
33.51 |
| 2026-05-26 00:00 |
12:35:46.66 |
+04:34:43.0 |
HIP 61417 |
33.63 |
| 2026-05-26 12:00 |
12:35:41.23 |
+04:35:16.1 |
HIP 61341 |
32.30 |
| 2026-05-27 00:00 |
12:35:35.96 |
+04:35:48.1 |
HIP 61341 |
30.99 |
| 2026-05-27 12:00 |
12:35:30.85 |
+04:36:18.7 |
HIP 61341 |
29.73 |
| 2026-05-28 00:00 |
12:35:25.90 |
+04:36:48.2 |
HIP 61341 |
28.53 |
| 2026-05-28 12:00 |
12:35:21.11 |
+04:37:16.4 |
HIP 61341 |
27.37 |
| 2026-05-29 00:00 |
12:35:16.48 |
+04:37:43.4 |
HIP 61341 |
26.28 |
| 2026-05-29 12:00 |
12:35:12.01 |
+04:38:09.1 |
HIP 61341 |
25.23 |
| 2026-05-30 00:00 |
12:35:07.71 |
+04:38:33.6 |
HIP 61341 |
24.25 |
| 2026-05-30 12:00 |
12:35:03.56 |
+04:38:56.9 |
HIP 61341 |
23.31 |
| 2026-05-31 00:00 |
12:34:59.57 |
+04:39:18.9 |
HIP 61341 |
22.43 |
| 2026-05-31 12:00 |
12:34:55.75 |
+04:39:39.8 |
HIP 61341 |
21.61 |
| 2026-06-01 00:00 |
12:34:52.08 |
+04:39:59.4 |
HIP 61341 |
20.84 |
| 2026-06-01 12:00 |
12:34:48.58 |
+04:40:17.8 |
HIP 61341 |
20.13 |
| 2026-06-02 00:00 |
12:34:45.24 |
+04:40:35.0 |
HIP 61341 |
19.47 |