| Parameter |
Value |
| Designation |
P/2022 D1 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-08-28T02:02:35.586240Z |
| Orbit solution date (soln_date, UTC) |
2022-05-19T21:13:41Z |
| Obs used |
97 |
| NEO |
- |
| M1 |
15.900 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2022-02-24T13:16:06.585600Z |
| Discovery magnitude (MPC) |
20.71 w |
| Discovery observatory (MPC) |
F52 · Pan-STARRS 2, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2022-03-09.0000000 |
| e |
0.54702589 |
| q (au) |
3.352561 |
| a (au) |
7.401219 |
| i (deg) |
44.064028 |
| Ω (om, deg) |
47.965841 |
| ω (w, deg) |
88.712500 |
| M (ma, deg) |
9.443106 |
Magnitude
Scatter + Global Linear
$$
M_a = (19.752 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
19.752 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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) |
| 2026-09-25 00:00 |
17:24:00.87 |
-56:42:09.8 |
HIP 85145 |
9.40 |
| 2026-09-25 12:00 |
17:24:09.92 |
-56:40:58.7 |
HIP 85145 |
8.33 |
| 2026-09-26 00:00 |
17:24:19.14 |
-56:39:48.0 |
HIP 85145 |
7.51 |
| 2026-09-26 12:00 |
17:24:28.52 |
-56:38:37.6 |
HIP 85145 |
7.05 |
| 2026-09-27 00:00 |
17:24:38.07 |
-56:37:27.5 |
HIP 85145 |
7.03 |
| 2026-09-27 12:00 |
17:24:47.78 |
-56:36:17.7 |
HIP 85145 |
7.46 |
| 2026-09-28 00:00 |
17:24:57.65 |
-56:35:08.3 |
HIP 85145 |
8.28 |
| 2026-09-28 12:00 |
17:25:07.68 |
-56:33:59.2 |
HIP 85145 |
9.40 |
| 2026-09-29 00:00 |
17:25:17.88 |
-56:32:50.5 |
HIP 85267 |
10.21 |
| 2026-09-29 12:00 |
17:25:28.23 |
-56:31:42.1 |
HIP 85267 |
9.06 |
| 2026-09-30 00:00 |
17:25:38.74 |
-56:30:34.1 |
HIP 85267 |
8.18 |
| 2026-09-30 12:00 |
17:25:49.42 |
-56:29:26.4 |
HIP 85267 |
7.66 |
| 2026-10-01 00:00 |
17:26:00.25 |
-56:28:19.0 |
HIP 85267 |
7.59 |
| 2026-10-01 12:00 |
17:26:11.23 |
-56:27:12.1 |
HIP 85267 |
7.99 |
| 2026-10-02 00:00 |
17:26:22.37 |
-56:26:05.4 |
HIP 85267 |
8.82 |
| 2026-10-02 12:00 |
17:26:33.67 |
-56:24:59.2 |
HIP 85267 |
9.96 |
| 2026-10-03 00:00 |
17:26:45.13 |
-56:23:53.3 |
HIP 85267 |
11.34 |
| 2026-10-03 12:00 |
17:26:56.73 |
-56:22:47.7 |
HIP 85267 |
12.88 |
| 2026-10-04 00:00 |
17:27:08.49 |
-56:21:42.6 |
HIP 85267 |
14.55 |
| 2026-10-04 12:00 |
17:27:20.40 |
-56:20:37.8 |
HIP 85267 |
16.29 |
| 2026-10-05 00:00 |
17:27:32.47 |
-56:19:33.4 |
HIP 85267 |
18.11 |
| 2026-10-05 12:00 |
17:27:44.68 |
-56:18:29.4 |
HIP 85267 |
19.98 |
| 2026-10-06 00:00 |
17:27:57.04 |
-56:17:25.7 |
HIP 85267 |
21.89 |
| 2026-10-06 12:00 |
17:28:09.56 |
-56:16:22.5 |
HIP 85267 |
23.84 |
| 2026-10-07 00:00 |
17:28:22.22 |
-56:15:19.6 |
HIP 85267 |
25.82 |
| 2026-10-07 12:00 |
17:28:35.03 |
-56:14:17.2 |
HIP 85267 |
27.83 |
| 2026-10-08 00:00 |
17:28:47.98 |
-56:13:15.1 |
HIP 85267 |
29.86 |
| 2026-10-08 12:00 |
17:29:01.08 |
-56:12:13.4 |
HIP 85267 |
31.92 |
| 2026-10-09 00:00 |
17:29:14.33 |
-56:11:12.1 |
HIP 85897 |
33.47 |
| 2026-10-09 12:00 |
17:29:27.71 |
-56:10:11.3 |
HIP 85897 |
31.85 |
| 2026-10-10 00:00 |
17:29:41.24 |
-56:09:10.8 |
HIP 85897 |
30.27 |
| 2026-10-10 12:00 |
17:29:54.92 |
-56:08:10.8 |
HIP 85897 |
28.74 |
| 2026-10-11 00:00 |
17:30:08.73 |
-56:07:11.1 |
HIP 85897 |
27.27 |
| 2026-10-11 12:00 |
17:30:22.68 |
-56:06:11.9 |
HIP 85897 |
25.87 |
| 2026-10-12 00:00 |
17:30:36.78 |
-56:05:13.1 |
HIP 85897 |
24.57 |
| 2026-10-12 12:00 |
17:30:51.01 |
-56:04:14.7 |
HIP 85897 |
23.38 |
| 2026-10-13 00:00 |
17:31:05.37 |
-56:03:16.7 |
HIP 85897 |
22.32 |
| 2026-10-13 12:00 |
17:31:19.87 |
-56:02:19.2 |
HIP 85897 |
21.42 |
| 2026-10-14 00:00 |
17:31:34.51 |
-56:01:22.1 |
HIP 85897 |
20.71 |
| 2026-10-14 12:00 |
17:31:49.28 |
-56:00:25.4 |
HIP 85897 |
20.20 |
| 2026-10-15 00:00 |
17:32:04.18 |
-55:59:29.1 |
HIP 85897 |
19.92 |
| 2026-10-15 12:00 |
17:32:19.22 |
-55:58:33.3 |
HIP 85897 |
19.89 |
| 2026-10-16 00:00 |
17:32:34.39 |
-55:57:37.9 |
HIP 85897 |
20.11 |