P/2022 P2 (ZTF)
| Parameter |
Value |
| Designation |
P/2022 P2 (ZTF) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2022-07-10T18:53:10.579200Z |
| Orbit solution date (soln_date, UTC) |
2023-12-06T01:15:05Z |
| Obs used |
159 |
| NEO |
- |
| M1 |
9.200 |
| K1 |
21.750 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2022-08-15T12:02:27.830400Z |
| Discovery magnitude (MPC) |
18.50 r |
| Discovery observatory (MPC) |
I41 · Palomar Mountain–ZTF |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2022-10-21.0000000 |
| e |
0.55791731 |
| q (au) |
1.982265 |
| a (au) |
4.483923 |
| i (deg) |
12.442869 |
| Ω (om, deg) |
291.231117 |
| ω (w, deg) |
137.589592 |
| M (ma, deg) |
10.610193 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.155 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.155 |
| n |
6.000 |
| gf |
0.800 |
| gb |
-0.504 |
| k |
1.000 |
| δ90 |
1.000 |
| 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 |
15:49:36.55 |
-30:29:26.5 |
HIP 77513 |
14.62 |
| 2026-02-03 12:00 |
15:49:46.92 |
-30:30:31.6 |
HIP 77513 |
15.88 |
| 2026-02-04 00:00 |
15:49:57.16 |
-30:31:36.5 |
HIP 77513 |
17.39 |
| 2026-02-04 12:00 |
15:50:07.26 |
-30:32:41.1 |
HIP 77665 |
15.87 |
| 2026-02-05 00:00 |
15:50:17.22 |
-30:33:45.4 |
HIP 77665 |
13.56 |
| 2026-02-05 12:00 |
15:50:27.04 |
-30:34:49.5 |
HIP 77665 |
11.31 |
| 2026-02-06 00:00 |
15:50:36.71 |
-30:35:53.3 |
HIP 77665 |
9.16 |
| 2026-02-06 12:00 |
15:50:46.24 |
-30:36:56.8 |
HIP 77665 |
7.16 |
| 2026-02-07 00:00 |
15:50:55.63 |
-30:38:00.1 |
HIP 77665 |
5.43 |
| 2026-02-07 12:00 |
15:51:04.87 |
-30:39:03.0 |
HIP 77665 |
4.28 |
| 2026-02-08 00:00 |
15:51:13.96 |
-30:40:05.7 |
HIP 77665 |
4.16 |
| 2026-02-08 12:00 |
15:51:22.91 |
-30:41:08.0 |
HIP 77683 |
2.43 |
| 2026-02-09 00:00 |
15:51:31.71 |
-30:42:10.1 |
HIP 77683 |
0.30 |
| 2026-02-09 12:00 |
15:51:40.36 |
-30:43:11.9 |
HIP 77683 |
1.86 |
| 2026-02-10 00:00 |
15:51:48.86 |
-30:44:13.4 |
HIP 77683 |
3.95 |
| 2026-02-10 12:00 |
15:51:57.21 |
-30:45:14.5 |
HIP 77683 |
6.01 |
| 2026-02-11 00:00 |
15:52:05.41 |
-30:46:15.4 |
HIP 77683 |
8.05 |
| 2026-02-11 12:00 |
15:52:13.46 |
-30:47:16.0 |
HIP 77683 |
10.05 |
| 2026-02-12 00:00 |
15:52:21.35 |
-30:48:16.2 |
HIP 77683 |
12.02 |
| 2026-02-12 12:00 |
15:52:29.09 |
-30:49:16.1 |
HIP 77683 |
13.96 |
| 2026-02-13 00:00 |
15:52:36.67 |
-30:50:15.7 |
HIP 77683 |
15.87 |
| 2026-02-13 12:00 |
15:52:44.10 |
-30:51:15.0 |
HIP 77683 |
17.74 |
| 2026-02-14 00:00 |
15:52:51.38 |
-30:52:14.0 |
HIP 77683 |
19.58 |
| 2026-02-14 12:00 |
15:52:58.49 |
-30:53:12.6 |
HIP 77683 |
21.40 |
| 2026-02-15 00:00 |
15:53:05.45 |
-30:54:10.9 |
HIP 77683 |
23.18 |
| 2026-02-15 12:00 |
15:53:12.25 |
-30:55:08.9 |
HIP 77683 |
24.93 |
| 2026-02-16 00:00 |
15:53:18.90 |
-30:56:06.5 |
HIP 77683 |
26.64 |
| 2026-02-16 12:00 |
15:53:25.38 |
-30:57:03.8 |
HIP 77985 |
27.97 |
| 2026-02-17 00:00 |
15:53:31.70 |
-30:58:00.7 |
HIP 77985 |
26.40 |
| 2026-02-17 12:00 |
15:53:37.86 |
-30:58:57.3 |
HIP 77985 |
24.88 |
| 2026-02-18 00:00 |
15:53:43.85 |
-30:59:53.5 |
HIP 77985 |
23.42 |
| 2026-02-18 12:00 |
15:53:49.69 |
-31:00:49.4 |
HIP 77985 |
22.00 |
| 2026-02-19 00:00 |
15:53:55.36 |
-31:01:44.9 |
HIP 77985 |
20.64 |
| 2026-02-19 12:00 |
15:54:00.86 |
-31:02:40.1 |
HIP 77985 |
19.34 |
| 2026-02-20 00:00 |
15:54:06.21 |
-31:03:34.8 |
HIP 77985 |
18.11 |
| 2026-02-20 12:00 |
15:54:11.38 |
-31:04:29.2 |
HIP 77985 |
16.95 |
| 2026-02-21 00:00 |
15:54:16.39 |
-31:05:23.3 |
HIP 77985 |
15.87 |
| 2026-02-21 12:00 |
15:54:21.24 |
-31:06:16.9 |
HIP 77985 |
14.88 |
| 2026-02-22 00:00 |
15:54:25.92 |
-31:07:10.2 |
HIP 77985 |
13.99 |
| 2026-02-22 12:00 |
15:54:30.43 |
-31:08:03.0 |
HIP 77985 |
13.21 |
| 2026-02-23 00:00 |
15:54:34.77 |
-31:08:55.5 |
HIP 77985 |
12.55 |
| 2026-02-23 12:00 |
15:54:38.94 |
-31:09:47.6 |
HIP 77985 |
12.02 |
| 2026-02-24 00:00 |
15:54:42.95 |
-31:10:39.3 |
HIP 77985 |
11.63 |