| Parameter |
Value |
| Designation |
515P/PANSTARRS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2017-01-28T02:52:28.689600Z |
| Orbit solution date (soln_date, UTC) |
2026-06-09T11:12:51Z |
| Obs used |
128 |
| NEO |
- |
| M1 |
15.000 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2026-01-13T10:43:53.846400Z |
| Discovery magnitude (MPC) |
21.24 G |
| Discovery observatory (MPC) |
V00 · Kitt Peak-Bok |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2019-08-01.0000000 |
| e |
0.36142137 |
| q (au) |
2.800018 |
| a (au) |
4.384767 |
| i (deg) |
20.406894 |
| Ω (om, deg) |
120.773513 |
| ω (w, deg) |
16.586492 |
| M (ma, deg) |
98.208387 |
Magnitude
Scatter + Global Linear
$$
M_a = (20.000 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
20.000 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.768 |
| k |
0.824 |
| 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) |
| 2026-09-20 00:00 |
12:58:43.00 |
+10:46:57.4 |
HIP 63390 |
12.01 |
| 2026-09-20 12:00 |
12:59:24.50 |
+10:42:44.7 |
HIP 63390 |
2.85 |
| 2026-09-21 00:00 |
13:00:05.99 |
+10:38:32.5 |
HIP 63390 |
10.73 |
| 2026-09-21 12:00 |
13:00:47.49 |
+10:34:20.8 |
HIP 63390 |
21.57 |
| 2026-09-22 00:00 |
13:01:28.98 |
+10:30:09.7 |
HIP 63558 |
22.00 |
| 2026-09-22 12:00 |
13:02:10.47 |
+10:25:59.1 |
HIP 63558 |
20.89 |
| 2026-09-23 00:00 |
13:02:51.96 |
+10:21:49.1 |
HIP 63558 |
25.15 |
| 2026-09-23 12:00 |
13:03:33.44 |
+10:17:39.6 |
HIP 63877 |
28.34 |
| 2026-09-24 00:00 |
13:04:14.93 |
+10:13:30.7 |
HIP 63877 |
18.15 |
| 2026-09-24 12:00 |
13:04:56.41 |
+10:09:22.3 |
HIP 63877 |
9.91 |
| 2026-09-25 00:00 |
13:05:37.88 |
+10:05:14.5 |
HIP 63877 |
10.45 |
| 2026-09-25 12:00 |
13:06:19.36 |
+10:01:07.3 |
HIP 63877 |
19.04 |
| 2026-09-26 00:00 |
13:07:00.83 |
+09:57:00.7 |
HIP 64114 |
28.36 |
| 2026-09-26 12:00 |
13:07:42.29 |
+09:52:54.6 |
HIP 64114 |
18.47 |
| 2026-09-27 00:00 |
13:08:23.76 |
+09:48:49.1 |
HIP 64158 |
9.13 |
| 2026-09-27 12:00 |
13:09:05.22 |
+09:44:44.3 |
HIP 64158 |
2.01 |
| 2026-09-28 00:00 |
13:09:46.67 |
+09:40:40.0 |
HIP 64262 |
11.28 |
| 2026-09-28 12:00 |
13:10:28.12 |
+09:36:36.3 |
HIP 64262 |
5.22 |
| 2026-09-29 00:00 |
13:11:09.57 |
+09:32:33.2 |
HIP 64345 |
5.80 |
| 2026-09-29 12:00 |
13:11:51.01 |
+09:28:30.8 |
HIP 64345 |
11.54 |
| 2026-09-30 00:00 |
13:12:32.44 |
+09:24:28.9 |
HIP 64345 |
21.77 |
| 2026-09-30 12:00 |
13:13:13.87 |
+09:20:27.7 |
HIP 64566 |
28.72 |
| 2026-10-01 00:00 |
13:13:55.30 |
+09:16:27.1 |
HIP 64698 |
29.53 |
| 2026-10-01 12:00 |
13:14:36.72 |
+09:12:27.1 |
HIP 64698 |
18.82 |
| 2026-10-02 00:00 |
13:15:18.14 |
+09:08:27.8 |
HIP 64698 |
8.84 |
| 2026-10-02 12:00 |
13:15:59.55 |
+09:04:29.1 |
HIP 64698 |
6.54 |
| 2026-10-03 00:00 |
13:16:40.95 |
+09:00:31.1 |
HIP 64806 |
4.15 |
| 2026-10-03 12:00 |
13:17:22.35 |
+08:56:33.7 |
HIP 64806 |
8.73 |
| 2026-10-04 00:00 |
13:18:03.74 |
+08:52:37.0 |
HIP 64806 |
19.38 |
| 2026-10-04 12:00 |
13:18:45.12 |
+08:48:40.9 |
HIP 65009 |
15.30 |
| 2026-10-05 00:00 |
13:19:26.50 |
+08:44:45.6 |
HIP 65009 |
6.21 |
| 2026-10-05 12:00 |
13:20:07.87 |
+08:40:50.9 |
HIP 65009 |
9.10 |
| 2026-10-06 00:00 |
13:20:49.23 |
+08:36:56.9 |
HIP 65044 |
15.05 |
| 2026-10-06 12:00 |
13:21:30.58 |
+08:33:03.6 |
HIP 65105 |
23.25 |
| 2026-10-07 00:00 |
13:22:11.93 |
+08:29:11.0 |
HIP 65263 |
24.18 |
| 2026-10-07 12:00 |
13:22:53.27 |
+08:25:19.1 |
HIP 65263 |
28.29 |
| 2026-10-08 00:00 |
13:23:34.59 |
+08:21:27.9 |
HIP 65263 |
35.41 |
| 2026-10-08 12:00 |
13:24:15.91 |
+08:17:37.4 |
HIP 65542 |
28.33 |
| 2026-10-09 00:00 |
13:24:57.22 |
+08:13:47.7 |
HIP 65542 |
17.81 |
| 2026-10-09 12:00 |
13:25:38.51 |
+08:09:58.7 |
HIP 65542 |
8.34 |
| 2026-10-10 00:00 |
13:26:19.80 |
+08:06:10.5 |
HIP 65542 |
7.74 |
| 2026-10-10 12:00 |
13:27:01.07 |
+08:02:23.0 |
HIP 65542 |
16.95 |
| 2026-10-11 00:00 |
13:27:42.34 |
+07:58:36.3 |
HIP 65696 |
23.81 |