| Parameter |
Value |
| Designation |
380P/PANSTARRS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2019-06-06T22:55:01.165440Z |
| Orbit solution date (soln_date, UTC) |
2023-02-06T22:13:34Z |
| Obs used |
266 |
| NEO |
- |
| M1 |
7.600 |
| K1 |
20.000 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2011-07-27T11:29:39.984000Z |
| Discovery magnitude (MPC) |
22.90 G |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2018-10-25.0000000 |
| e |
0.32644250 |
| q (au) |
3.049709 |
| a (au) |
4.527763 |
| i (deg) |
8.234018 |
| Ω (om, deg) |
133.114129 |
| ω (w, deg) |
90.060499 |
| M (ma, deg) |
336.986963 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.310 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.310 |
| n |
6.000 |
| gf |
0.906 |
| gb |
-0.918 |
| k |
1.000 |
| δ90 |
5.286 |
| 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 |
| 2018-01-16 |
2019-06-02 |
+10.1851 |
-5.046 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
07:00:25.16 |
+19:32:16.2 |
HIP 33572 |
32.75 |
| 2026-07-29 12:00 |
07:00:55.62 |
+19:31:42.8 |
HIP 33926 |
27.36 |
| 2026-07-30 00:00 |
07:01:26.06 |
+19:31:09.1 |
HIP 33926 |
21.99 |
| 2026-07-30 12:00 |
07:01:56.47 |
+19:30:35.0 |
HIP 33926 |
17.94 |
| 2026-07-31 00:00 |
07:02:26.85 |
+19:30:00.4 |
HIP 33926 |
16.23 |
| 2026-07-31 12:00 |
07:02:57.20 |
+19:29:25.5 |
HIP 33926 |
17.56 |
| 2026-08-01 00:00 |
07:03:27.52 |
+19:28:50.2 |
HIP 34016 |
15.52 |
| 2026-08-01 12:00 |
07:03:57.81 |
+19:28:14.5 |
HIP 34016 |
16.31 |
| 2026-08-02 00:00 |
07:04:28.08 |
+19:27:38.4 |
HIP 34016 |
19.85 |
| 2026-08-02 12:00 |
07:04:58.31 |
+19:27:01.9 |
HIP 34172 |
22.78 |
| 2026-08-03 00:00 |
07:05:28.51 |
+19:26:25.0 |
HIP 34243 |
19.93 |
| 2026-08-03 12:00 |
07:05:58.67 |
+19:25:47.8 |
HIP 34243 |
19.40 |
| 2026-08-04 00:00 |
07:06:28.81 |
+19:25:10.2 |
HIP 34300 |
18.70 |
| 2026-08-04 12:00 |
07:06:58.91 |
+19:24:32.2 |
HIP 34300 |
18.74 |
| 2026-08-05 00:00 |
07:07:28.97 |
+19:23:53.8 |
HIP 34300 |
21.30 |
| 2026-08-05 12:00 |
07:07:59.00 |
+19:23:15.1 |
HIP 34520 |
19.01 |
| 2026-08-06 00:00 |
07:08:29.00 |
+19:22:35.9 |
HIP 34520 |
13.85 |
| 2026-08-06 12:00 |
07:08:58.96 |
+19:21:56.5 |
HIP 34520 |
11.10 |
| 2026-08-07 00:00 |
07:09:28.88 |
+19:21:16.6 |
HIP 34520 |
12.46 |
| 2026-08-07 12:00 |
07:09:58.76 |
+19:20:36.4 |
HIP 34656 |
9.69 |
| 2026-08-08 00:00 |
07:10:28.60 |
+19:19:55.9 |
HIP 34660 |
2.71 |
| 2026-08-08 12:00 |
07:10:58.41 |
+19:19:15.0 |
HIP 34660 |
4.36 |
| 2026-08-09 00:00 |
07:11:28.17 |
+19:18:33.7 |
HIP 34660 |
11.41 |
| 2026-08-09 12:00 |
07:11:57.89 |
+19:17:52.1 |
HIP 34660 |
18.46 |
| 2026-08-10 00:00 |
07:12:27.57 |
+19:17:10.2 |
HIP 34900 |
24.53 |
| 2026-08-10 12:00 |
07:12:57.21 |
+19:16:27.9 |
HIP 34900 |
21.57 |
| 2026-08-11 00:00 |
07:13:26.80 |
+19:15:45.3 |
HIP 34900 |
20.68 |
| 2026-08-11 12:00 |
07:13:56.35 |
+19:15:02.3 |
HIP 34900 |
22.09 |
| 2026-08-12 00:00 |
07:14:25.86 |
+19:14:19.0 |
HIP 35086 |
17.09 |
| 2026-08-12 12:00 |
07:14:55.31 |
+19:13:35.4 |
HIP 35086 |
11.78 |
| 2026-08-13 00:00 |
07:15:24.72 |
+19:12:51.5 |
HIP 35086 |
9.14 |
| 2026-08-13 12:00 |
07:15:54.08 |
+19:12:07.2 |
HIP 35086 |
11.20 |
| 2026-08-14 00:00 |
07:16:23.39 |
+19:11:22.7 |
HIP 35086 |
16.26 |
| 2026-08-14 12:00 |
07:16:52.65 |
+19:10:37.8 |
HIP 35086 |
22.35 |
| 2026-08-15 00:00 |
07:17:21.87 |
+19:09:52.6 |
HIP 35331 |
24.08 |
| 2026-08-15 12:00 |
07:17:51.03 |
+19:09:07.2 |
HIP 35331 |
23.71 |
| 2026-08-16 00:00 |
07:18:20.13 |
+19:08:21.4 |
HIP 35331 |
25.31 |
| 2026-08-16 12:00 |
07:18:49.19 |
+19:07:35.3 |
HIP 35331 |
28.54 |
| 2026-08-17 00:00 |
07:19:18.19 |
+19:06:49.0 |
HIP 35575 |
24.17 |
| 2026-08-17 12:00 |
07:19:47.13 |
+19:06:02.3 |
HIP 35575 |
20.58 |
| 2026-08-18 00:00 |
07:20:16.03 |
+19:05:15.4 |
HIP 35575 |
18.90 |
| 2026-08-18 12:00 |
07:20:44.86 |
+19:04:28.2 |
HIP 35693 |
17.40 |
| 2026-08-19 00:00 |
07:21:13.64 |
+19:03:40.7 |
HIP 35693 |
11.98 |