| Parameter |
Value |
| Designation |
426P/PANSTARRS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-01-07T12:47:27.709440Z |
| Orbit solution date (soln_date, UTC) |
2024-07-07T00:42:21Z |
| Obs used |
123 |
| NEO |
- |
| M1 |
17.400 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-01-08T09:04:12.288000Z |
| Discovery magnitude (MPC) |
20.40 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2019-10-23.0000000 |
| e |
0.16079592 |
| q (au) |
2.674492 |
| a (au) |
3.186938 |
| i (deg) |
17.774351 |
| Ω (om, deg) |
280.524873 |
| ω (w, deg) |
119.396158 |
| M (ma, deg) |
113.205437 |
Magnitude
Scatter + Global Linear
$$
M_a = (16.705 + 2.066\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.705 |
| n |
2.066 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
1.000 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-25 00:00 |
14:11:46.46 |
-25:40:25.0 |
HIP 69433 |
18.75 |
| 2026-09-25 12:00 |
14:12:23.74 |
-25:42:03.5 |
HIP 69433 |
13.90 |
| 2026-09-26 00:00 |
14:13:01.10 |
-25:43:42.3 |
HIP 69433 |
13.49 |
| 2026-09-26 12:00 |
14:13:38.53 |
-25:45:21.6 |
HIP 69433 |
17.84 |
| 2026-09-27 00:00 |
14:14:16.03 |
-25:47:01.3 |
HIP 69433 |
24.57 |
| 2026-09-27 12:00 |
14:14:53.61 |
-25:48:41.3 |
HIP 69433 |
32.22 |
| 2026-09-28 00:00 |
14:15:31.26 |
-25:50:21.8 |
HIP 69718 |
30.02 |
| 2026-09-28 12:00 |
14:16:08.98 |
-25:52:02.6 |
HIP 69718 |
30.12 |
| 2026-09-29 00:00 |
14:16:46.77 |
-25:53:43.8 |
HIP 69900 |
28.57 |
| 2026-09-29 12:00 |
14:17:24.63 |
-25:55:25.4 |
HIP 69900 |
21.51 |
| 2026-09-30 00:00 |
14:18:02.56 |
-25:57:07.3 |
HIP 69965 |
15.49 |
| 2026-09-30 12:00 |
14:18:40.57 |
-25:58:49.5 |
HIP 69965 |
10.88 |
| 2026-10-01 00:00 |
14:19:18.64 |
-26:00:32.2 |
HIP 69965 |
12.21 |
| 2026-10-01 12:00 |
14:19:56.78 |
-26:02:15.1 |
HIP 69965 |
18.24 |
| 2026-10-02 00:00 |
14:20:35.00 |
-26:03:58.4 |
HIP 69965 |
25.89 |
| 2026-10-02 12:00 |
14:21:13.28 |
-26:05:42.0 |
HIP 70328 |
33.26 |
| 2026-10-03 00:00 |
14:21:51.63 |
-26:07:25.9 |
HIP 70328 |
27.12 |
| 2026-10-03 12:00 |
14:22:30.05 |
-26:09:10.2 |
HIP 70328 |
22.80 |
| 2026-10-04 00:00 |
14:23:08.53 |
-26:10:54.7 |
HIP 70422 |
16.91 |
| 2026-10-04 12:00 |
14:23:47.09 |
-26:12:39.5 |
HIP 70422 |
8.92 |
| 2026-10-05 00:00 |
14:24:25.71 |
-26:14:24.7 |
HIP 70422 |
5.38 |
| 2026-10-05 12:00 |
14:25:04.39 |
-26:16:10.1 |
HIP 70422 |
11.61 |
| 2026-10-06 00:00 |
14:25:43.15 |
-26:17:55.8 |
HIP 70422 |
19.95 |
| 2026-10-06 12:00 |
14:26:21.97 |
-26:19:41.7 |
HIP 70422 |
28.62 |
| 2026-10-07 00:00 |
14:27:00.85 |
-26:21:27.9 |
HIP 70614 |
30.38 |
| 2026-10-07 12:00 |
14:27:39.80 |
-26:23:14.4 |
HIP 70614 |
31.34 |
| 2026-10-08 00:00 |
14:28:18.81 |
-26:25:01.1 |
HIP 70866 |
29.15 |
| 2026-10-08 12:00 |
14:28:57.89 |
-26:26:48.1 |
HIP 70866 |
27.05 |
| 2026-10-09 00:00 |
14:29:37.02 |
-26:28:35.2 |
HIP 71019 |
26.33 |
| 2026-10-09 12:00 |
14:30:16.22 |
-26:30:22.6 |
HIP 71019 |
17.42 |
| 2026-10-10 00:00 |
14:30:55.49 |
-26:32:10.3 |
HIP 71019 |
8.58 |
| 2026-10-10 12:00 |
14:31:34.81 |
-26:33:58.1 |
HIP 71019 |
2.15 |
| 2026-10-11 00:00 |
14:32:14.19 |
-26:35:46.1 |
HIP 71019 |
9.84 |
| 2026-10-11 12:00 |
14:32:53.64 |
-26:37:34.4 |
HIP 71084 |
13.25 |
| 2026-10-12 00:00 |
14:33:33.14 |
-26:39:22.8 |
HIP 71084 |
19.62 |
| 2026-10-12 12:00 |
14:34:12.70 |
-26:41:11.3 |
HIP 71084 |
27.51 |
| 2026-10-13 00:00 |
14:34:52.32 |
-26:43:00.1 |
HIP 71443 |
25.36 |
| 2026-10-13 12:00 |
14:35:31.99 |
-26:44:49.0 |
HIP 71443 |
18.16 |
| 2026-10-14 00:00 |
14:36:11.73 |
-26:46:38.1 |
HIP 71443 |
13.43 |
| 2026-10-14 12:00 |
14:36:51.52 |
-26:48:27.3 |
HIP 71443 |
13.98 |
| 2026-10-15 00:00 |
14:37:31.36 |
-26:50:16.7 |
HIP 71443 |
19.37 |
| 2026-10-15 12:00 |
14:38:11.26 |
-26:52:06.1 |
HIP 71682 |
21.81 |
| 2026-10-16 00:00 |
14:38:51.21 |
-26:53:55.8 |
HIP 71682 |
15.28 |