| Parameter |
Value |
| Designation |
C/2026 J1 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2026-06-30T02:06:46.699200Z |
| Orbit solution date (soln_date, UTC) |
2026-05-28T12:12:21Z |
| Obs used |
190 |
| NEO |
- |
| M1 |
13.800 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2026-05-14T13:38:37.622400Z |
| Discovery magnitude (MPC) |
20.48 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2026-05-20.0000000 |
| e |
0.89920709 |
| q (au) |
2.523819 |
| a (au) |
25.039651 |
| i (deg) |
73.102818 |
| Ω (om, deg) |
100.376846 |
| ω (w, deg) |
129.420533 |
| M (ma, deg) |
359.676796 |
Magnitude
Scatter + Global Linear
$$
M_a = (10.897 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
10.897 |
| n |
6.000 |
| gf |
0.999 |
| gb |
-0.998 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
17:48:16.94 |
+55:53:27.1 |
HIP 86952 |
28.21 |
| 2026-06-01 12:00 |
17:47:13.25 |
+55:47:17.7 |
HIP 86952 |
17.91 |
| 2026-06-02 00:00 |
17:46:09.49 |
+55:40:59.1 |
HIP 86952 |
8.91 |
| 2026-06-02 12:00 |
17:45:05.68 |
+55:34:31.3 |
HIP 86952 |
8.88 |
| 2026-06-03 00:00 |
17:44:01.84 |
+55:27:54.0 |
HIP 86952 |
18.09 |
| 2026-06-03 12:00 |
17:42:57.98 |
+55:21:07.4 |
HIP 86781 |
14.37 |
| 2026-06-04 00:00 |
17:41:54.13 |
+55:14:11.4 |
HIP 86781 |
18.29 |
| 2026-06-04 12:00 |
17:40:50.29 |
+55:07:05.9 |
HIP 86781 |
26.96 |
| 2026-06-05 00:00 |
17:39:46.50 |
+54:59:50.8 |
HIP 86781 |
37.31 |
| 2026-06-05 12:00 |
17:38:42.75 |
+54:52:26.2 |
HIP 86058 |
30.65 |
| 2026-06-06 00:00 |
17:37:39.08 |
+54:44:52.0 |
HIP 86058 |
25.63 |
| 2026-06-06 12:00 |
17:36:35.50 |
+54:37:08.1 |
HIP 86058 |
25.74 |
| 2026-06-07 00:00 |
17:35:32.02 |
+54:29:14.6 |
HIP 86058 |
31.04 |
| 2026-06-07 12:00 |
17:34:28.66 |
+54:21:11.3 |
HIP 85759 |
26.48 |
| 2026-06-08 00:00 |
17:33:25.45 |
+54:12:58.4 |
HIP 85759 |
19.22 |
| 2026-06-08 12:00 |
17:32:22.39 |
+54:04:35.6 |
HIP 85758 |
11.13 |
| 2026-06-09 00:00 |
17:31:19.50 |
+53:56:03.1 |
HIP 85758 |
1.46 |
| 2026-06-09 12:00 |
17:30:16.81 |
+53:47:20.8 |
HIP 85758 |
14.15 |
| 2026-06-10 00:00 |
17:29:14.31 |
+53:38:28.6 |
HIP 85758 |
26.97 |
| 2026-06-10 12:00 |
17:28:12.04 |
+53:29:26.7 |
HIP 85669 |
28.34 |
| 2026-06-11 00:00 |
17:27:10.01 |
+53:20:14.8 |
HIP 85244 |
21.97 |
| 2026-06-11 12:00 |
17:26:08.23 |
+53:10:53.2 |
HIP 85244 |
9.44 |
| 2026-06-12 00:00 |
17:25:06.72 |
+53:01:21.6 |
HIP 85244 |
6.60 |
| 2026-06-12 12:00 |
17:24:05.49 |
+52:51:40.2 |
HIP 85268 |
12.61 |
| 2026-06-13 00:00 |
17:23:04.57 |
+52:41:49.0 |
HIP 85268 |
21.86 |
| 2026-06-13 12:00 |
17:22:03.96 |
+52:31:47.9 |
HIP 85268 |
34.15 |
| 2026-06-14 00:00 |
17:21:03.67 |
+52:21:36.9 |
HIP 84629 |
27.80 |
| 2026-06-14 12:00 |
17:20:03.74 |
+52:11:16.1 |
HIP 84793 |
18.46 |
| 2026-06-15 00:00 |
17:19:04.16 |
+52:00:45.6 |
HIP 84793 |
10.95 |
| 2026-06-15 12:00 |
17:18:04.95 |
+51:50:05.2 |
HIP 84793 |
16.99 |
| 2026-06-16 00:00 |
17:17:06.13 |
+51:39:15.0 |
HIP 84453 |
13.96 |
| 2026-06-16 12:00 |
17:16:07.71 |
+51:28:15.2 |
HIP 84453 |
20.13 |
| 2026-06-17 00:00 |
17:15:09.70 |
+51:17:05.6 |
HIP 84453 |
32.10 |
| 2026-06-17 12:00 |
17:14:12.12 |
+51:05:46.4 |
HIP 84044 |
33.68 |
| 2026-06-18 00:00 |
17:13:14.97 |
+50:54:17.6 |
HIP 84044 |
33.14 |
| 2026-06-18 12:00 |
17:12:18.27 |
+50:42:39.2 |
HIP 84044 |
38.70 |
| 2026-06-19 00:00 |
17:11:22.03 |
+50:30:51.3 |
HIP 83857 |
35.29 |
| 2026-06-19 12:00 |
17:10:26.27 |
+50:18:53.9 |
HIP 84108 |
36.13 |
| 2026-06-20 00:00 |
17:09:30.98 |
+50:06:47.1 |
HIP 83885 |
22.86 |
| 2026-06-20 12:00 |
17:08:36.19 |
+49:54:31.0 |
HIP 83885 |
9.23 |
| 2026-06-21 00:00 |
17:07:41.89 |
+49:42:05.6 |
HIP 83885 |
10.22 |
| 2026-06-21 12:00 |
17:06:48.11 |
+49:29:30.9 |
HIP 83885 |
24.28 |
| 2026-06-22 00:00 |
17:05:54.84 |
+49:16:47.1 |
HIP 83563 |
30.23 |