380P/PANSTARRS
| 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
$$
M_a = (9.299 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.299 |
| n |
6.000 |
| gf |
0.909 |
| gb |
-0.918 |
| k |
1.000 |
| δ90 |
5.576 |
| 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 |
+10.1875 |
-5.048 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
04:59:04.38 |
+16:28:38.2 |
HIP 23227 |
24.14 |
| 2026-02-03 12:00 |
04:58:59.41 |
+16:29:20.5 |
HIP 23227 |
24.14 |
| 2026-02-04 00:00 |
04:58:54.66 |
+16:30:03.2 |
HIP 23227 |
24.18 |
| 2026-02-04 12:00 |
04:58:50.13 |
+16:30:46.3 |
HIP 23227 |
24.26 |
| 2026-02-05 00:00 |
04:58:45.81 |
+16:31:29.7 |
HIP 23227 |
24.37 |
| 2026-02-05 12:00 |
04:58:41.71 |
+16:32:13.5 |
HIP 23227 |
24.50 |
| 2026-02-06 00:00 |
04:58:37.82 |
+16:32:57.7 |
HIP 23227 |
24.65 |
| 2026-02-06 12:00 |
04:58:34.16 |
+16:33:42.3 |
HIP 23227 |
24.81 |
| 2026-02-07 00:00 |
04:58:30.71 |
+16:34:27.2 |
HIP 23227 |
24.98 |
| 2026-02-07 12:00 |
04:58:27.48 |
+16:35:12.6 |
HIP 23227 |
25.15 |
| 2026-02-08 00:00 |
04:58:24.47 |
+16:35:58.2 |
HIP 22990 |
24.59 |
| 2026-02-08 12:00 |
04:58:21.68 |
+16:36:44.3 |
HIP 22990 |
23.71 |
| 2026-02-09 00:00 |
04:58:19.10 |
+16:37:30.7 |
HIP 22990 |
22.89 |
| 2026-02-09 12:00 |
04:58:16.75 |
+16:38:17.5 |
HIP 22990 |
22.14 |
| 2026-02-10 00:00 |
04:58:14.61 |
+16:39:04.6 |
HIP 22990 |
21.45 |
| 2026-02-10 12:00 |
04:58:12.70 |
+16:39:52.1 |
HIP 22990 |
20.83 |
| 2026-02-11 00:00 |
04:58:11.00 |
+16:40:39.9 |
HIP 22990 |
20.28 |
| 2026-02-11 12:00 |
04:58:09.52 |
+16:41:28.0 |
HIP 22990 |
19.81 |
| 2026-02-12 00:00 |
04:58:08.26 |
+16:42:16.5 |
HIP 22990 |
19.42 |
| 2026-02-12 12:00 |
04:58:07.23 |
+16:43:05.4 |
HIP 22990 |
19.11 |
| 2026-02-13 00:00 |
04:58:06.41 |
+16:43:54.6 |
HIP 22990 |
18.89 |
| 2026-02-13 12:00 |
04:58:05.81 |
+16:44:44.1 |
HIP 22990 |
18.76 |
| 2026-02-14 00:00 |
04:58:05.43 |
+16:45:33.9 |
HIP 22990 |
18.72 |
| 2026-02-14 12:00 |
04:58:05.28 |
+16:46:24.0 |
HIP 22990 |
18.76 |
| 2026-02-15 00:00 |
04:58:05.34 |
+16:47:14.5 |
HIP 22990 |
18.90 |
| 2026-02-15 12:00 |
04:58:05.62 |
+16:48:05.3 |
HIP 22990 |
19.13 |
| 2026-02-16 00:00 |
04:58:06.12 |
+16:48:56.4 |
HIP 22990 |
19.44 |
| 2026-02-16 12:00 |
04:58:06.84 |
+16:49:47.8 |
HIP 22990 |
19.84 |
| 2026-02-17 00:00 |
04:58:07.78 |
+16:50:39.5 |
HIP 22990 |
20.31 |
| 2026-02-17 12:00 |
04:58:08.94 |
+16:51:31.5 |
HIP 22990 |
20.87 |
| 2026-02-18 00:00 |
04:58:10.32 |
+16:52:23.8 |
HIP 23043 |
20.36 |
| 2026-02-18 12:00 |
04:58:11.91 |
+16:53:16.3 |
HIP 23043 |
19.87 |
| 2026-02-19 00:00 |
04:58:13.72 |
+16:54:09.2 |
HIP 23043 |
19.44 |
| 2026-02-19 12:00 |
04:58:15.76 |
+16:55:02.3 |
HIP 23043 |
19.08 |
| 2026-02-20 00:00 |
04:58:18.00 |
+16:55:55.7 |
HIP 23043 |
18.81 |
| 2026-02-20 12:00 |
04:58:20.47 |
+16:56:49.4 |
HIP 23043 |
18.62 |
| 2026-02-21 00:00 |
04:58:23.15 |
+16:57:43.4 |
HIP 23043 |
18.53 |
| 2026-02-21 12:00 |
04:58:26.05 |
+16:58:37.6 |
HIP 23043 |
18.55 |
| 2026-02-22 00:00 |
04:58:29.16 |
+16:59:32.0 |
HIP 23043 |
18.68 |
| 2026-02-22 12:00 |
04:58:32.49 |
+17:00:26.7 |
HIP 23043 |
18.92 |
| 2026-02-23 00:00 |
04:58:36.03 |
+17:01:21.7 |
HIP 23043 |
19.28 |
| 2026-02-23 12:00 |
04:58:39.79 |
+17:02:16.9 |
HIP 23043 |
19.76 |
| 2026-02-24 00:00 |
04:58:43.75 |
+17:03:12.3 |
HIP 23043 |
20.36 |