| Parameter |
Value |
| Designation |
400P/PANSTARRS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-02-09T22:37:16.553280Z |
| Orbit solution date (soln_date, UTC) |
2024-10-05T23:12:48Z |
| Obs used |
414 |
| NEO |
- |
| M1 |
13.800 |
| K1 |
12.250 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2020-09-10T09:07:24.096000Z |
| Discovery magnitude (MPC) |
19.20 G |
| Discovery observatory (MPC) |
G96 · Mt. Lemmon Survey |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2020-02-27.0000000 |
| e |
0.40901297 |
| q (au) |
2.104108 |
| a (au) |
3.560329 |
| i (deg) |
10.926393 |
| Ω (om, deg) |
176.405371 |
| ω (w, deg) |
238.711384 |
| M (ma, deg) |
308.805563 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.776 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.776 |
| n |
6.000 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2020-06-01 |
2020-08-29 |
+19.2128 |
-6.748 |
| 2020-08-29 |
2021-02-07 |
+8.6813 |
-3.045 |
| 2021-02-10 |
2022-02-24 |
+1.7883 |
-1.680 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
20:21:28.91 |
-08:05:29.6 |
HIP 100326 |
23.26 |
| 2026-05-12 12:00 |
20:21:35.42 |
-08:03:58.2 |
HIP 100326 |
22.71 |
| 2026-05-13 00:00 |
20:21:41.69 |
-08:02:27.5 |
HIP 100326 |
22.34 |
| 2026-05-13 12:00 |
20:21:47.73 |
-08:00:57.5 |
HIP 100326 |
22.15 |
| 2026-05-14 00:00 |
20:21:53.54 |
-07:59:28.2 |
HIP 100326 |
22.12 |
| 2026-05-14 12:00 |
20:21:59.11 |
-07:57:59.7 |
HIP 100326 |
22.25 |
| 2026-05-15 00:00 |
20:22:04.44 |
-07:56:32.0 |
HIP 100326 |
22.51 |
| 2026-05-15 12:00 |
20:22:09.53 |
-07:55:05.0 |
HIP 100326 |
22.90 |
| 2026-05-16 00:00 |
20:22:14.39 |
-07:53:38.8 |
HIP 100326 |
23.38 |
| 2026-05-16 12:00 |
20:22:19.00 |
-07:52:13.4 |
HIP 100326 |
23.95 |
| 2026-05-17 00:00 |
20:22:23.37 |
-07:50:48.8 |
HIP 100326 |
24.59 |
| 2026-05-17 12:00 |
20:22:27.51 |
-07:49:25.0 |
HIP 100326 |
25.28 |
| 2026-05-18 00:00 |
20:22:31.40 |
-07:48:02.0 |
HIP 100596 |
23.92 |
| 2026-05-18 12:00 |
20:22:35.04 |
-07:46:39.9 |
HIP 100596 |
22.45 |
| 2026-05-19 00:00 |
20:22:38.44 |
-07:45:18.6 |
HIP 100596 |
21.07 |
| 2026-05-19 12:00 |
20:22:41.60 |
-07:43:58.2 |
HIP 100596 |
19.79 |
| 2026-05-20 00:00 |
20:22:44.52 |
-07:42:38.7 |
HIP 100596 |
18.60 |
| 2026-05-20 12:00 |
20:22:47.18 |
-07:41:20.0 |
HIP 100596 |
17.53 |
| 2026-05-21 00:00 |
20:22:49.60 |
-07:40:02.2 |
HIP 100596 |
16.59 |
| 2026-05-21 12:00 |
20:22:51.78 |
-07:38:45.4 |
HIP 100596 |
15.78 |
| 2026-05-22 00:00 |
20:22:53.71 |
-07:37:29.5 |
HIP 100596 |
15.11 |
| 2026-05-22 12:00 |
20:22:55.39 |
-07:36:14.5 |
HIP 100596 |
14.61 |
| 2026-05-23 00:00 |
20:22:56.82 |
-07:35:00.4 |
HIP 100596 |
14.27 |
| 2026-05-23 12:00 |
20:22:58.00 |
-07:33:47.3 |
HIP 100596 |
14.10 |
| 2026-05-24 00:00 |
20:22:58.93 |
-07:32:35.1 |
HIP 100596 |
14.09 |
| 2026-05-24 12:00 |
20:22:59.62 |
-07:31:23.9 |
HIP 100596 |
14.24 |
| 2026-05-25 00:00 |
20:23:00.05 |
-07:30:13.7 |
HIP 100596 |
14.55 |
| 2026-05-25 12:00 |
20:23:00.23 |
-07:29:04.5 |
HIP 100596 |
14.99 |
| 2026-05-26 00:00 |
20:23:00.17 |
-07:27:56.3 |
HIP 100596 |
15.54 |
| 2026-05-26 12:00 |
20:22:59.84 |
-07:26:49.1 |
HIP 100596 |
16.20 |
| 2026-05-27 00:00 |
20:22:59.27 |
-07:25:42.9 |
HIP 100596 |
16.95 |
| 2026-05-27 12:00 |
20:22:58.45 |
-07:24:37.7 |
HIP 100596 |
17.78 |
| 2026-05-28 00:00 |
20:22:57.37 |
-07:23:33.6 |
HIP 100596 |
18.67 |
| 2026-05-28 12:00 |
20:22:56.04 |
-07:22:30.5 |
HIP 100596 |
19.62 |
| 2026-05-29 00:00 |
20:22:54.45 |
-07:21:28.6 |
HIP 100596 |
20.61 |
| 2026-05-29 12:00 |
20:22:52.61 |
-07:20:27.6 |
HIP 100596 |
21.65 |
| 2026-05-30 00:00 |
20:22:50.52 |
-07:19:27.8 |
HIP 100596 |
22.72 |
| 2026-05-30 12:00 |
20:22:48.17 |
-07:18:29.1 |
HIP 100596 |
23.83 |
| 2026-05-31 00:00 |
20:22:45.56 |
-07:17:31.4 |
HIP 100596 |
24.98 |
| 2026-05-31 12:00 |
20:22:42.70 |
-07:16:34.9 |
HIP 100596 |
26.15 |
| 2026-06-01 00:00 |
20:22:39.58 |
-07:15:39.5 |
HIP 100596 |
27.35 |
| 2026-06-01 12:00 |
20:22:36.21 |
-07:14:45.3 |
HIP 100596 |
28.58 |
| 2026-06-02 00:00 |
20:22:32.58 |
-07:13:52.2 |
HIP 100596 |
29.84 |