| 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) |
| 2026-07-29 00:00 |
13:10:46.18 |
-23:56:03.1 |
HIP 64303 |
14.70 |
| 2026-07-29 12:00 |
13:11:10.49 |
-23:55:53.2 |
HIP 64303 |
15.82 |
| 2026-07-30 00:00 |
13:11:34.95 |
-23:55:44.8 |
HIP 64303 |
18.60 |
| 2026-07-30 12:00 |
13:11:59.58 |
-23:55:37.9 |
HIP 64303 |
22.46 |
| 2026-07-31 00:00 |
13:12:24.35 |
-23:55:32.4 |
HIP 64303 |
26.97 |
| 2026-07-31 12:00 |
13:12:49.29 |
-23:55:28.3 |
HIP 64603 |
31.13 |
| 2026-08-01 00:00 |
13:13:14.37 |
-23:55:25.6 |
HIP 64603 |
27.33 |
| 2026-08-01 12:00 |
13:13:39.62 |
-23:55:24.3 |
HIP 64670 |
23.47 |
| 2026-08-02 00:00 |
13:14:05.01 |
-23:55:24.4 |
HIP 64670 |
17.82 |
| 2026-08-02 12:00 |
13:14:30.55 |
-23:55:25.9 |
HIP 64670 |
12.27 |
| 2026-08-03 00:00 |
13:14:56.25 |
-23:55:28.8 |
HIP 64670 |
7.14 |
| 2026-08-03 12:00 |
13:15:22.09 |
-23:55:33.1 |
HIP 64670 |
4.50 |
| 2026-08-04 00:00 |
13:15:48.09 |
-23:55:38.7 |
HIP 64670 |
7.71 |
| 2026-08-04 12:00 |
13:16:14.23 |
-23:55:45.7 |
HIP 64670 |
13.03 |
| 2026-08-05 00:00 |
13:16:40.52 |
-23:55:54.0 |
HIP 64670 |
18.78 |
| 2026-08-05 12:00 |
13:17:06.96 |
-23:56:03.6 |
HIP 64670 |
24.68 |
| 2026-08-06 00:00 |
13:17:33.54 |
-23:56:14.6 |
HIP 64753 |
29.46 |
| 2026-08-06 12:00 |
13:18:00.26 |
-23:56:26.9 |
HIP 64753 |
33.69 |
| 2026-08-07 00:00 |
13:18:27.13 |
-23:56:40.6 |
HIP 65124 |
33.41 |
| 2026-08-07 12:00 |
13:18:54.15 |
-23:56:55.5 |
HIP 65124 |
27.74 |
| 2026-08-08 00:00 |
13:19:21.30 |
-23:57:11.7 |
HIP 65124 |
22.33 |
| 2026-08-08 12:00 |
13:19:48.60 |
-23:57:29.3 |
HIP 65124 |
17.45 |
| 2026-08-09 00:00 |
13:20:16.04 |
-23:57:48.1 |
HIP 65124 |
13.74 |
| 2026-08-09 12:00 |
13:20:43.62 |
-23:58:08.2 |
HIP 65124 |
12.34 |
| 2026-08-10 00:00 |
13:21:11.33 |
-23:58:29.5 |
HIP 65124 |
14.01 |
| 2026-08-10 12:00 |
13:21:39.19 |
-23:58:52.1 |
HIP 65124 |
17.95 |
| 2026-08-11 00:00 |
13:22:07.18 |
-23:59:16.0 |
HIP 65124 |
23.05 |
| 2026-08-11 12:00 |
13:22:35.31 |
-23:59:41.1 |
HIP 65124 |
28.72 |
| 2026-08-12 00:00 |
13:23:03.58 |
-24:00:07.4 |
HIP 65124 |
34.70 |
| 2026-08-12 12:00 |
13:23:31.98 |
-24:00:35.0 |
HIP 65324 |
38.85 |
| 2026-08-13 00:00 |
13:24:00.51 |
-24:01:03.8 |
HIP 65324 |
39.37 |
| 2026-08-13 12:00 |
13:24:29.18 |
-24:01:33.7 |
HIP 65574 |
33.83 |
| 2026-08-14 00:00 |
13:24:57.97 |
-24:02:04.9 |
HIP 65574 |
27.92 |
| 2026-08-14 12:00 |
13:25:26.90 |
-24:02:37.2 |
HIP 65574 |
22.37 |
| 2026-08-15 00:00 |
13:25:55.96 |
-24:03:10.8 |
HIP 65574 |
17.54 |
| 2026-08-15 12:00 |
13:26:25.15 |
-24:03:45.5 |
HIP 65574 |
14.23 |
| 2026-08-16 00:00 |
13:26:54.46 |
-24:04:21.3 |
HIP 65602 |
13.21 |
| 2026-08-16 12:00 |
13:27:23.91 |
-24:04:58.3 |
HIP 65602 |
13.32 |
| 2026-08-17 00:00 |
13:27:53.47 |
-24:05:36.4 |
HIP 65602 |
16.47 |
| 2026-08-17 12:00 |
13:28:23.16 |
-24:06:15.7 |
HIP 65602 |
21.39 |
| 2026-08-18 00:00 |
13:28:52.98 |
-24:06:56.0 |
HIP 65602 |
27.16 |
| 2026-08-18 12:00 |
13:29:22.92 |
-24:07:37.5 |
HIP 65885 |
22.65 |
| 2026-08-19 00:00 |
13:29:52.98 |
-24:08:20.0 |
HIP 65885 |
18.82 |