| 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) |
| 2026-07-29 00:00 |
11:46:23.01 |
+18:42:53.7 |
HIP 57417 |
2.38 |
| 2026-07-29 12:00 |
11:47:02.80 |
+18:38:19.1 |
HIP 57417 |
10.79 |
| 2026-07-30 00:00 |
11:47:42.62 |
+18:33:44.4 |
HIP 57417 |
21.15 |
| 2026-07-30 12:00 |
11:48:22.48 |
+18:29:09.6 |
HIP 57617 |
21.35 |
| 2026-07-31 00:00 |
11:49:02.37 |
+18:24:34.7 |
HIP 57655 |
11.98 |
| 2026-07-31 12:00 |
11:49:42.29 |
+18:19:59.7 |
HIP 57655 |
6.88 |
| 2026-08-01 00:00 |
11:50:22.25 |
+18:15:24.6 |
HIP 57655 |
13.16 |
| 2026-08-01 12:00 |
11:51:02.24 |
+18:10:49.5 |
HIP 57709 |
22.25 |
| 2026-08-02 00:00 |
11:51:42.26 |
+18:06:14.2 |
HIP 57709 |
26.46 |
| 2026-08-02 12:00 |
11:52:22.32 |
+18:01:38.9 |
HIP 58034 |
26.46 |
| 2026-08-03 00:00 |
11:53:02.40 |
+17:57:03.6 |
HIP 58034 |
20.33 |
| 2026-08-03 12:00 |
11:53:42.52 |
+17:52:28.2 |
HIP 58070 |
12.21 |
| 2026-08-04 00:00 |
11:54:22.67 |
+17:47:52.7 |
HIP 58070 |
5.62 |
| 2026-08-04 12:00 |
11:55:02.85 |
+17:43:17.1 |
HIP 58070 |
11.78 |
| 2026-08-05 00:00 |
11:55:43.06 |
+17:38:41.6 |
HIP 58070 |
21.72 |
| 2026-08-05 12:00 |
11:56:23.30 |
+17:34:06.0 |
HIP 58327 |
19.81 |
| 2026-08-06 00:00 |
11:57:03.57 |
+17:29:30.3 |
HIP 58327 |
9.38 |
| 2026-08-06 12:00 |
11:57:43.87 |
+17:24:54.6 |
HIP 58327 |
3.18 |
| 2026-08-07 00:00 |
11:58:24.20 |
+17:20:18.9 |
HIP 58447 |
9.67 |
| 2026-08-07 12:00 |
11:59:04.56 |
+17:15:43.2 |
HIP 58447 |
5.40 |
| 2026-08-08 00:00 |
11:59:44.94 |
+17:11:07.5 |
HIP 58447 |
13.88 |
| 2026-08-08 12:00 |
12:00:25.36 |
+17:06:31.8 |
HIP 58634 |
18.17 |
| 2026-08-09 00:00 |
12:01:05.80 |
+17:01:56.0 |
HIP 58634 |
7.95 |
| 2026-08-09 12:00 |
12:01:46.27 |
+16:57:20.3 |
HIP 58634 |
5.03 |
| 2026-08-10 00:00 |
12:02:26.77 |
+16:52:44.6 |
HIP 58634 |
14.74 |
| 2026-08-10 12:00 |
12:03:07.29 |
+16:48:08.9 |
HIP 58634 |
25.29 |
| 2026-08-11 00:00 |
12:03:47.84 |
+16:43:33.3 |
HIP 58893 |
30.37 |
| 2026-08-11 12:00 |
12:04:28.42 |
+16:38:57.7 |
HIP 58893 |
23.06 |
| 2026-08-12 00:00 |
12:05:09.02 |
+16:34:22.1 |
HIP 59011 |
17.09 |
| 2026-08-12 12:00 |
12:05:49.65 |
+16:29:46.6 |
HIP 59011 |
16.77 |
| 2026-08-13 00:00 |
12:06:30.30 |
+16:25:11.1 |
HIP 59011 |
22.41 |
| 2026-08-13 12:00 |
12:07:10.98 |
+16:20:35.7 |
HIP 59011 |
30.90 |
| 2026-08-14 00:00 |
12:07:51.67 |
+16:16:00.4 |
HIP 59274 |
25.51 |
| 2026-08-14 12:00 |
12:08:32.40 |
+16:11:25.2 |
HIP 59274 |
19.48 |
| 2026-08-15 00:00 |
12:09:13.14 |
+16:06:50.1 |
HIP 59274 |
18.46 |
| 2026-08-15 12:00 |
12:09:53.91 |
+16:02:15.0 |
HIP 59334 |
20.74 |
| 2026-08-16 00:00 |
12:10:34.69 |
+15:57:40.1 |
HIP 59334 |
24.93 |
| 2026-08-16 12:00 |
12:11:15.50 |
+15:53:05.3 |
HIP 59535 |
21.03 |
| 2026-08-17 00:00 |
12:11:56.33 |
+15:48:30.6 |
HIP 59535 |
17.63 |
| 2026-08-17 12:00 |
12:12:37.18 |
+15:43:56.0 |
HIP 59535 |
20.35 |
| 2026-08-18 00:00 |
12:13:18.05 |
+15:39:21.6 |
HIP 59634 |
13.70 |
| 2026-08-18 12:00 |
12:13:58.93 |
+15:34:47.2 |
HIP 59634 |
7.39 |
| 2026-08-19 00:00 |
12:14:39.84 |
+15:30:13.1 |
HIP 59634 |
12.54 |