P/2022 D1 (PANSTARRS)
| 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) |
| 2026-02-03 00:00 |
18:01:04.28 |
-51:34:44.4 |
HIP 88222 |
9.66 |
| 2026-02-03 12:00 |
18:01:23.68 |
-51:36:13.5 |
HIP 88222 |
11.79 |
| 2026-02-04 00:00 |
18:01:42.98 |
-51:37:43.0 |
HIP 88399 |
12.54 |
| 2026-02-04 12:00 |
18:02:02.20 |
-51:39:13.0 |
HIP 88399 |
9.50 |
| 2026-02-05 00:00 |
18:02:21.33 |
-51:40:43.4 |
HIP 88399 |
6.77 |
| 2026-02-05 12:00 |
18:02:40.37 |
-51:42:14.3 |
HIP 88399 |
4.87 |
| 2026-02-06 00:00 |
18:02:59.32 |
-51:43:45.6 |
HIP 88399 |
4.87 |
| 2026-02-06 12:00 |
18:03:18.17 |
-51:45:17.3 |
HIP 88399 |
6.76 |
| 2026-02-07 00:00 |
18:03:36.93 |
-51:46:49.5 |
HIP 88399 |
9.45 |
| 2026-02-07 12:00 |
18:03:55.60 |
-51:48:22.2 |
HIP 88399 |
12.43 |
| 2026-02-08 00:00 |
18:04:14.17 |
-51:49:55.3 |
HIP 88399 |
15.52 |
| 2026-02-08 12:00 |
18:04:32.65 |
-51:51:28.8 |
HIP 88675 |
16.42 |
| 2026-02-09 00:00 |
18:04:51.03 |
-51:53:02.9 |
HIP 88675 |
14.72 |
| 2026-02-09 12:00 |
18:05:09.31 |
-51:54:37.3 |
HIP 88675 |
13.62 |
| 2026-02-10 00:00 |
18:05:27.49 |
-51:56:12.2 |
HIP 88675 |
13.24 |
| 2026-02-10 12:00 |
18:05:45.57 |
-51:57:47.6 |
HIP 88675 |
13.66 |
| 2026-02-11 00:00 |
18:06:03.54 |
-51:59:23.4 |
HIP 88675 |
14.78 |
| 2026-02-11 12:00 |
18:06:21.42 |
-52:00:59.6 |
HIP 88675 |
16.47 |
| 2026-02-12 00:00 |
18:06:39.19 |
-52:02:36.3 |
HIP 88835 |
17.24 |
| 2026-02-12 12:00 |
18:06:56.86 |
-52:04:13.5 |
HIP 88835 |
14.16 |
| 2026-02-13 00:00 |
18:07:14.42 |
-52:05:51.1 |
HIP 88835 |
11.13 |
| 2026-02-13 12:00 |
18:07:31.87 |
-52:07:29.1 |
HIP 88835 |
8.20 |
| 2026-02-14 00:00 |
18:07:49.22 |
-52:09:07.6 |
HIP 88835 |
5.50 |
| 2026-02-14 12:00 |
18:08:06.46 |
-52:10:46.6 |
HIP 88835 |
3.55 |
| 2026-02-15 00:00 |
18:08:23.58 |
-52:12:26.0 |
HIP 88835 |
3.78 |
| 2026-02-15 12:00 |
18:08:40.60 |
-52:14:05.8 |
HIP 88835 |
5.91 |
| 2026-02-16 00:00 |
18:08:57.51 |
-52:15:46.1 |
HIP 88835 |
8.63 |
| 2026-02-16 12:00 |
18:09:14.30 |
-52:17:26.9 |
HIP 88835 |
11.51 |
| 2026-02-17 00:00 |
18:09:30.97 |
-52:19:08.0 |
HIP 88835 |
14.46 |
| 2026-02-17 12:00 |
18:09:47.53 |
-52:20:49.7 |
HIP 89054 |
16.38 |
| 2026-02-18 00:00 |
18:10:03.98 |
-52:22:31.7 |
HIP 89054 |
13.81 |
| 2026-02-18 12:00 |
18:10:20.31 |
-52:24:14.2 |
HIP 89054 |
11.47 |
| 2026-02-19 00:00 |
18:10:36.52 |
-52:25:57.2 |
HIP 89054 |
9.50 |
| 2026-02-19 12:00 |
18:10:52.60 |
-52:27:40.6 |
HIP 89054 |
8.18 |
| 2026-02-20 00:00 |
18:11:08.57 |
-52:29:24.4 |
HIP 89054 |
7.82 |
| 2026-02-20 12:00 |
18:11:24.42 |
-52:31:08.7 |
HIP 89054 |
8.53 |
| 2026-02-21 00:00 |
18:11:40.14 |
-52:32:53.4 |
HIP 89054 |
10.08 |
| 2026-02-21 12:00 |
18:11:55.75 |
-52:34:38.5 |
HIP 89054 |
12.14 |
| 2026-02-22 00:00 |
18:12:11.22 |
-52:36:24.1 |
HIP 89054 |
14.49 |
| 2026-02-22 12:00 |
18:12:26.57 |
-52:38:10.0 |
HIP 89054 |
17.00 |
| 2026-02-23 00:00 |
18:12:41.80 |
-52:39:56.5 |
HIP 89054 |
19.61 |
| 2026-02-23 12:00 |
18:12:56.90 |
-52:41:43.3 |
HIP 89286 |
21.93 |
| 2026-02-24 00:00 |
18:13:11.87 |
-52:43:30.6 |
HIP 89286 |
23.64 |