| Parameter |
Value |
| Designation |
C/2015 J1 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2014-06-29T23:13:39.259200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:10Z |
| Obs used |
54 |
| NEO |
- |
| M1 |
7.500 |
| K1 |
11.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2015-08-08.0000000 |
| e |
1.00318272 |
| q (au) |
6.019565 |
| a (au) |
-1891.328665 |
| i (deg) |
94.998299 |
| Ω (om, deg) |
219.992187 |
| ω (w, deg) |
315.467882 |
| M (ma, deg) |
0.004841 |
Magnitude
Scatter + Global Linear
$$
M_a = (5.428 + 5.041\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
5.428 |
| n |
5.041 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| 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) |
| 2026-06-01 00:00 |
16:10:29.06 |
+60:56:23.1 |
HIP 79345 |
17.51 |
| 2026-06-01 12:00 |
16:10:20.09 |
+60:56:26.8 |
HIP 79345 |
17.98 |
| 2026-06-02 00:00 |
16:10:11.13 |
+60:56:29.8 |
HIP 79345 |
18.50 |
| 2026-06-02 12:00 |
16:10:02.19 |
+60:56:32.3 |
HIP 79345 |
19.08 |
| 2026-06-03 00:00 |
16:09:53.25 |
+60:56:34.1 |
HIP 79014 |
18.83 |
| 2026-06-03 12:00 |
16:09:44.33 |
+60:56:35.3 |
HIP 79014 |
17.93 |
| 2026-06-04 00:00 |
16:09:35.42 |
+60:56:35.9 |
HIP 79014 |
17.04 |
| 2026-06-04 12:00 |
16:09:26.53 |
+60:56:35.8 |
HIP 79014 |
16.17 |
| 2026-06-05 00:00 |
16:09:17.65 |
+60:56:35.1 |
HIP 79014 |
15.32 |
| 2026-06-05 12:00 |
16:09:08.79 |
+60:56:33.8 |
HIP 79014 |
14.50 |
| 2026-06-06 00:00 |
16:08:59.95 |
+60:56:31.8 |
HIP 79014 |
13.71 |
| 2026-06-06 12:00 |
16:08:51.12 |
+60:56:29.3 |
HIP 79014 |
12.95 |
| 2026-06-07 00:00 |
16:08:42.32 |
+60:56:26.1 |
HIP 79014 |
12.23 |
| 2026-06-07 12:00 |
16:08:33.53 |
+60:56:22.3 |
HIP 79014 |
11.56 |
| 2026-06-08 00:00 |
16:08:24.76 |
+60:56:17.9 |
HIP 79014 |
10.95 |
| 2026-06-08 12:00 |
16:08:16.02 |
+60:56:12.8 |
HIP 79014 |
10.40 |
| 2026-06-09 00:00 |
16:08:07.29 |
+60:56:07.1 |
HIP 79014 |
9.93 |
| 2026-06-09 12:00 |
16:07:58.59 |
+60:56:00.9 |
HIP 79014 |
9.55 |
| 2026-06-10 00:00 |
16:07:49.91 |
+60:55:54.0 |
HIP 79014 |
9.26 |
| 2026-06-10 12:00 |
16:07:41.26 |
+60:55:46.5 |
HIP 79014 |
9.08 |
| 2026-06-11 00:00 |
16:07:32.63 |
+60:55:38.3 |
HIP 79014 |
9.01 |
| 2026-06-11 12:00 |
16:07:24.02 |
+60:55:29.6 |
HIP 79014 |
9.05 |
| 2026-06-12 00:00 |
16:07:15.45 |
+60:55:20.3 |
HIP 79014 |
9.20 |
| 2026-06-12 12:00 |
16:07:06.90 |
+60:55:10.3 |
HIP 79014 |
9.46 |
| 2026-06-13 00:00 |
16:06:58.38 |
+60:54:59.8 |
HIP 79014 |
9.82 |
| 2026-06-13 12:00 |
16:06:49.89 |
+60:54:48.6 |
HIP 79014 |
10.26 |
| 2026-06-14 00:00 |
16:06:41.42 |
+60:54:36.8 |
HIP 79014 |
10.78 |
| 2026-06-14 12:00 |
16:06:32.99 |
+60:54:24.5 |
HIP 79014 |
11.36 |
| 2026-06-15 00:00 |
16:06:24.59 |
+60:54:11.5 |
HIP 79014 |
12.00 |
| 2026-06-15 12:00 |
16:06:16.23 |
+60:53:58.0 |
HIP 79014 |
12.68 |
| 2026-06-16 00:00 |
16:06:07.89 |
+60:53:43.8 |
HIP 79014 |
13.40 |
| 2026-06-16 12:00 |
16:05:59.59 |
+60:53:29.1 |
HIP 79014 |
14.15 |
| 2026-06-17 00:00 |
16:05:51.33 |
+60:53:13.8 |
HIP 79014 |
14.93 |
| 2026-06-17 12:00 |
16:05:43.10 |
+60:52:57.9 |
HIP 79014 |
15.73 |
| 2026-06-18 00:00 |
16:05:34.90 |
+60:52:41.4 |
HIP 79014 |
16.55 |
| 2026-06-18 12:00 |
16:05:26.75 |
+60:52:24.3 |
HIP 79014 |
17.39 |
| 2026-06-19 00:00 |
16:05:18.63 |
+60:52:06.7 |
HIP 79014 |
18.24 |
| 2026-06-19 12:00 |
16:05:10.55 |
+60:51:48.5 |
HIP 79014 |
19.10 |
| 2026-06-20 00:00 |
16:05:02.51 |
+60:51:29.7 |
HIP 79014 |
19.97 |
| 2026-06-20 12:00 |
16:04:54.51 |
+60:51:10.3 |
HIP 79014 |
20.84 |
| 2026-06-21 00:00 |
16:04:46.54 |
+60:50:50.4 |
HIP 79014 |
21.73 |
| 2026-06-21 12:00 |
16:04:38.63 |
+60:50:29.9 |
HIP 79014 |
22.62 |
| 2026-06-22 00:00 |
16:04:30.75 |
+60:50:08.9 |
HIP 79014 |
23.51 |