| 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) |
| 2026-07-29 00:00 |
17:28:13.03 |
-59:07:10.6 |
HIP 85553 |
8.20 |
| 2026-07-29 12:00 |
17:27:59.35 |
-59:06:11.7 |
HIP 85553 |
9.12 |
| 2026-07-30 00:00 |
17:27:45.85 |
-59:05:12.0 |
HIP 85553 |
10.34 |
| 2026-07-30 12:00 |
17:27:32.53 |
-59:04:11.7 |
HIP 85553 |
11.74 |
| 2026-07-31 00:00 |
17:27:19.41 |
-59:03:10.8 |
HIP 85553 |
13.27 |
| 2026-07-31 12:00 |
17:27:06.47 |
-59:02:09.1 |
HIP 85263 |
13.62 |
| 2026-08-01 00:00 |
17:26:53.72 |
-59:01:06.8 |
HIP 85263 |
12.15 |
| 2026-08-01 12:00 |
17:26:41.16 |
-59:00:03.9 |
HIP 85263 |
10.85 |
| 2026-08-02 00:00 |
17:26:28.79 |
-58:59:00.4 |
HIP 85263 |
9.80 |
| 2026-08-02 12:00 |
17:26:16.61 |
-58:57:56.3 |
HIP 85263 |
9.05 |
| 2026-08-03 00:00 |
17:26:04.63 |
-58:56:51.5 |
HIP 85263 |
8.68 |
| 2026-08-03 12:00 |
17:25:52.84 |
-58:55:46.2 |
HIP 85263 |
8.73 |
| 2026-08-04 00:00 |
17:25:41.24 |
-58:54:40.3 |
HIP 85263 |
9.19 |
| 2026-08-04 12:00 |
17:25:29.84 |
-58:53:33.8 |
HIP 85263 |
9.98 |
| 2026-08-05 00:00 |
17:25:18.63 |
-58:52:26.8 |
HIP 85263 |
11.04 |
| 2026-08-05 12:00 |
17:25:07.63 |
-58:51:19.2 |
HIP 85263 |
12.29 |
| 2026-08-06 00:00 |
17:24:56.82 |
-58:50:11.1 |
HIP 85263 |
13.66 |
| 2026-08-06 12:00 |
17:24:46.21 |
-58:49:02.5 |
HIP 85116 |
12.15 |
| 2026-08-07 00:00 |
17:24:35.80 |
-58:47:53.4 |
HIP 85116 |
10.40 |
| 2026-08-07 12:00 |
17:24:25.59 |
-58:46:43.7 |
HIP 85116 |
8.67 |
| 2026-08-08 00:00 |
17:24:15.58 |
-58:45:33.6 |
HIP 85116 |
6.95 |
| 2026-08-08 12:00 |
17:24:05.78 |
-58:44:23.1 |
HIP 85116 |
5.27 |
| 2026-08-09 00:00 |
17:23:56.17 |
-58:43:12.0 |
HIP 85116 |
3.63 |
| 2026-08-09 12:00 |
17:23:46.77 |
-58:42:00.5 |
HIP 85116 |
2.12 |
| 2026-08-10 00:00 |
17:23:37.58 |
-58:40:48.6 |
HIP 85116 |
1.26 |
| 2026-08-10 12:00 |
17:23:28.59 |
-58:39:36.3 |
HIP 85116 |
2.07 |
| 2026-08-11 00:00 |
17:23:19.81 |
-58:38:23.5 |
HIP 85116 |
3.54 |
| 2026-08-11 12:00 |
17:23:11.23 |
-58:37:10.3 |
HIP 85116 |
5.11 |
| 2026-08-12 00:00 |
17:23:02.86 |
-58:35:56.8 |
HIP 85120 |
6.05 |
| 2026-08-12 12:00 |
17:22:54.69 |
-58:34:42.8 |
HIP 85038 |
6.39 |
| 2026-08-13 00:00 |
17:22:46.73 |
-58:33:28.5 |
HIP 85038 |
5.10 |
| 2026-08-13 12:00 |
17:22:38.99 |
-58:32:13.9 |
HIP 85038 |
4.02 |
| 2026-08-14 00:00 |
17:22:31.45 |
-58:30:58.9 |
HIP 85038 |
3.38 |
| 2026-08-14 12:00 |
17:22:24.11 |
-58:29:43.5 |
HIP 85038 |
3.39 |
| 2026-08-15 00:00 |
17:22:16.99 |
-58:28:27.9 |
HIP 85038 |
4.05 |
| 2026-08-15 12:00 |
17:22:10.08 |
-58:27:11.9 |
HIP 85038 |
5.09 |
| 2026-08-16 00:00 |
17:22:03.37 |
-58:25:55.7 |
HIP 85038 |
6.33 |
| 2026-08-16 12:00 |
17:21:56.88 |
-58:24:39.1 |
HIP 85038 |
7.65 |
| 2026-08-17 00:00 |
17:21:50.59 |
-58:23:22.3 |
HIP 85038 |
9.02 |
| 2026-08-17 12:00 |
17:21:44.52 |
-58:22:05.3 |
HIP 85038 |
10.42 |
| 2026-08-18 00:00 |
17:21:38.65 |
-58:20:47.9 |
HIP 85038 |
11.83 |
| 2026-08-18 12:00 |
17:21:33.00 |
-58:19:30.4 |
HIP 85038 |
13.24 |
| 2026-08-19 00:00 |
17:21:27.55 |
-58:18:12.6 |
HIP 85038 |
14.64 |