P/2022 R4 (PANSTARRS)
| 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) |
| 2026-02-03 00:00 |
13:17:11.67 |
-02:19:00.1 |
HIP 64963 |
28.89 |
| 2026-02-03 12:00 |
13:17:10.11 |
-02:17:41.9 |
HIP 64963 |
29.84 |
| 2026-02-04 00:00 |
13:17:08.37 |
-02:16:22.5 |
HIP 64963 |
30.87 |
| 2026-02-04 12:00 |
13:17:06.45 |
-02:15:02.0 |
HIP 64963 |
31.97 |
| 2026-02-05 00:00 |
13:17:04.37 |
-02:13:40.4 |
HIP 64963 |
33.14 |
| 2026-02-05 12:00 |
13:17:02.10 |
-02:12:17.7 |
HIP 64963 |
34.38 |
| 2026-02-06 00:00 |
13:16:59.67 |
-02:10:53.8 |
HIP 64963 |
35.69 |
| 2026-02-06 12:00 |
13:16:57.06 |
-02:09:28.9 |
HIP 64674 |
34.45 |
| 2026-02-07 00:00 |
13:16:54.27 |
-02:08:02.8 |
HIP 64674 |
32.94 |
| 2026-02-07 12:00 |
13:16:51.31 |
-02:06:35.6 |
HIP 64674 |
31.40 |
| 2026-02-08 00:00 |
13:16:48.18 |
-02:05:07.4 |
HIP 64674 |
29.82 |
| 2026-02-08 12:00 |
13:16:44.87 |
-02:03:38.0 |
HIP 64674 |
28.20 |
| 2026-02-09 00:00 |
13:16:41.39 |
-02:02:07.6 |
HIP 64674 |
26.55 |
| 2026-02-09 12:00 |
13:16:37.74 |
-02:00:36.0 |
HIP 64674 |
24.87 |
| 2026-02-10 00:00 |
13:16:33.91 |
-01:59:03.4 |
HIP 64674 |
23.16 |
| 2026-02-10 12:00 |
13:16:29.91 |
-01:57:29.7 |
HIP 64674 |
21.41 |
| 2026-02-11 00:00 |
13:16:25.73 |
-01:55:55.0 |
HIP 64674 |
19.65 |
| 2026-02-11 12:00 |
13:16:21.38 |
-01:54:19.1 |
HIP 64674 |
17.86 |
| 2026-02-12 00:00 |
13:16:16.86 |
-01:52:42.3 |
HIP 64674 |
16.06 |
| 2026-02-12 12:00 |
13:16:12.16 |
-01:51:04.3 |
HIP 64674 |
14.26 |
| 2026-02-13 00:00 |
13:16:07.30 |
-01:49:25.3 |
HIP 64674 |
12.47 |
| 2026-02-13 12:00 |
13:16:02.26 |
-01:47:45.3 |
HIP 64674 |
10.73 |
| 2026-02-14 00:00 |
13:15:57.05 |
-01:46:04.2 |
HIP 64674 |
9.10 |
| 2026-02-14 12:00 |
13:15:51.66 |
-01:44:22.1 |
HIP 64674 |
7.67 |
| 2026-02-15 00:00 |
13:15:46.11 |
-01:42:39.0 |
HIP 64674 |
6.62 |
| 2026-02-15 12:00 |
13:15:40.39 |
-01:40:54.8 |
HIP 64674 |
6.19 |
| 2026-02-16 00:00 |
13:15:34.50 |
-01:39:09.7 |
HIP 64674 |
6.54 |
| 2026-02-16 12:00 |
13:15:28.44 |
-01:37:23.5 |
HIP 64674 |
7.60 |
| 2026-02-17 00:00 |
13:15:22.21 |
-01:35:36.4 |
HIP 64674 |
9.16 |
| 2026-02-17 12:00 |
13:15:15.81 |
-01:33:48.3 |
HIP 64674 |
11.03 |
| 2026-02-18 00:00 |
13:15:09.24 |
-01:31:59.2 |
HIP 64674 |
13.11 |
| 2026-02-18 12:00 |
13:15:02.51 |
-01:30:09.2 |
HIP 64674 |
15.32 |
| 2026-02-19 00:00 |
13:14:55.62 |
-01:28:18.2 |
HIP 64674 |
17.64 |
| 2026-02-19 12:00 |
13:14:48.55 |
-01:26:26.2 |
HIP 64674 |
20.04 |
| 2026-02-20 00:00 |
13:14:41.33 |
-01:24:33.3 |
HIP 64674 |
22.51 |
| 2026-02-20 12:00 |
13:14:33.94 |
-01:22:39.5 |
HIP 64674 |
25.04 |
| 2026-02-21 00:00 |
13:14:26.39 |
-01:20:44.8 |
HIP 64674 |
27.62 |
| 2026-02-21 12:00 |
13:14:18.68 |
-01:18:49.2 |
HIP 64674 |
30.26 |
| 2026-02-22 00:00 |
13:14:10.80 |
-01:16:52.7 |
HIP 64674 |
32.94 |
| 2026-02-22 12:00 |
13:14:02.77 |
-01:14:55.3 |
HIP 64674 |
35.67 |
| 2026-02-23 00:00 |
13:13:54.58 |
-01:12:57.0 |
HIP 64460 |
36.81 |
| 2026-02-23 12:00 |
13:13:46.24 |
-01:10:57.9 |
HIP 64460 |
37.69 |
| 2026-02-24 00:00 |
13:13:37.73 |
-01:08:58.0 |
HIP 64460 |
38.77 |