| Parameter |
Value |
| Designation |
511P/PANSTARRS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2025-07-10T19:10:49.324800Z |
| Orbit solution date (soln_date, UTC) |
2026-03-12T02:52:17Z |
| Obs used |
86 |
| NEO |
- |
| M1 |
15.800 |
| K1 |
13.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2015-12-12T12:34:40.684800Z |
| Discovery magnitude (MPC) |
22.58 G |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2024-03-01.0000000 |
| e |
0.23765110 |
| q (au) |
2.295953 |
| a (au) |
3.011683 |
| i (deg) |
14.783495 |
| Ω (om, deg) |
271.030812 |
| ω (w, deg) |
81.166342 |
| M (ma, deg) |
266.314774 |
Magnitude
Scatter + Global Linear
$$
M_a = (16.304 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.304 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.567 |
| k |
0.800 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
07:56:15.13 |
+18:20:22.1 |
HIP 38890 |
23.10 |
| 2026-09-20 12:00 |
07:56:47.97 |
+18:17:22.3 |
HIP 38890 |
15.33 |
| 2026-09-21 00:00 |
07:57:20.63 |
+18:14:22.1 |
HIP 38890 |
8.70 |
| 2026-09-21 12:00 |
07:57:53.12 |
+18:11:21.7 |
HIP 38890 |
7.37 |
| 2026-09-22 00:00 |
07:58:25.43 |
+18:08:21.1 |
HIP 38890 |
13.01 |
| 2026-09-22 12:00 |
07:58:57.56 |
+18:05:20.3 |
HIP 38890 |
20.45 |
| 2026-09-23 00:00 |
07:59:29.52 |
+18:02:19.2 |
HIP 39169 |
21.08 |
| 2026-09-23 12:00 |
08:00:01.29 |
+17:59:17.9 |
HIP 39169 |
18.12 |
| 2026-09-24 00:00 |
08:00:32.89 |
+17:56:16.3 |
HIP 39169 |
18.57 |
| 2026-09-24 12:00 |
08:01:04.31 |
+17:53:14.6 |
HIP 39169 |
22.18 |
| 2026-09-25 00:00 |
08:01:35.54 |
+17:50:12.7 |
HIP 39169 |
27.71 |
| 2026-09-25 12:00 |
08:02:06.59 |
+17:47:10.6 |
HIP 39434 |
22.55 |
| 2026-09-26 00:00 |
08:02:37.46 |
+17:44:08.3 |
HIP 39434 |
14.92 |
| 2026-09-26 12:00 |
08:03:08.14 |
+17:41:05.8 |
HIP 39434 |
7.99 |
| 2026-09-27 00:00 |
08:03:38.63 |
+17:38:03.1 |
HIP 39434 |
5.51 |
| 2026-09-27 12:00 |
08:04:08.94 |
+17:35:00.3 |
HIP 39434 |
10.98 |
| 2026-09-28 00:00 |
08:04:39.06 |
+17:31:57.3 |
HIP 39587 |
11.52 |
| 2026-09-28 12:00 |
08:05:09.00 |
+17:28:54.1 |
HIP 39587 |
8.95 |
| 2026-09-29 00:00 |
08:05:38.74 |
+17:25:50.8 |
HIP 39587 |
12.15 |
| 2026-09-29 12:00 |
08:06:08.29 |
+17:22:47.4 |
HIP 39587 |
18.26 |
| 2026-09-30 00:00 |
08:06:37.65 |
+17:19:43.9 |
HIP 39737 |
13.36 |
| 2026-09-30 12:00 |
08:07:06.82 |
+17:16:40.2 |
HIP 39737 |
6.62 |
| 2026-10-01 00:00 |
08:07:35.79 |
+17:13:36.4 |
HIP 39737 |
4.94 |
| 2026-10-01 12:00 |
08:08:04.56 |
+17:10:32.5 |
HIP 39737 |
10.89 |
| 2026-10-02 00:00 |
08:08:33.14 |
+17:07:28.5 |
HIP 39737 |
18.01 |
| 2026-10-02 12:00 |
08:09:01.52 |
+17:04:24.4 |
HIP 39990 |
14.60 |
| 2026-10-03 00:00 |
08:09:29.70 |
+17:01:20.2 |
HIP 39990 |
7.47 |
| 2026-10-03 12:00 |
08:09:57.68 |
+16:58:16.0 |
HIP 39990 |
2.83 |
| 2026-10-04 00:00 |
08:10:25.45 |
+16:55:11.7 |
HIP 39990 |
8.25 |
| 2026-10-04 12:00 |
08:10:53.03 |
+16:52:07.3 |
HIP 40113 |
12.72 |
| 2026-10-05 00:00 |
08:11:20.39 |
+16:49:02.9 |
HIP 40113 |
11.39 |
| 2026-10-05 12:00 |
08:11:47.55 |
+16:45:58.5 |
HIP 40113 |
14.21 |
| 2026-10-06 00:00 |
08:12:14.50 |
+16:42:54.0 |
HIP 40133 |
12.94 |
| 2026-10-06 12:00 |
08:12:41.24 |
+16:39:49.5 |
HIP 40231 |
10.00 |
| 2026-10-07 00:00 |
08:13:07.77 |
+16:36:45.0 |
HIP 40231 |
6.20 |
| 2026-10-07 12:00 |
08:13:34.08 |
+16:33:40.5 |
HIP 40289 |
5.22 |
| 2026-10-08 00:00 |
08:14:00.18 |
+16:30:36.0 |
HIP 40289 |
9.81 |
| 2026-10-08 12:00 |
08:14:26.07 |
+16:27:31.5 |
HIP 40289 |
16.17 |
| 2026-10-09 00:00 |
08:14:51.74 |
+16:24:27.1 |
HIP 40410 |
19.82 |
| 2026-10-09 12:00 |
08:15:17.19 |
+16:21:22.7 |
HIP 40410 |
17.19 |
| 2026-10-10 00:00 |
08:15:42.42 |
+16:18:18.3 |
HIP 40410 |
17.05 |
| 2026-10-10 12:00 |
08:16:07.43 |
+16:15:14.0 |
HIP 40410 |
19.40 |
| 2026-10-11 00:00 |
08:16:32.21 |
+16:12:09.8 |
HIP 40410 |
23.47 |