| Parameter |
Value |
| Designation |
C/2026 L1 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2027-04-11T12:26:40.862400Z |
| Orbit solution date (soln_date, UTC) |
2026-09-21T07:12:14Z |
| Obs used |
214 |
| NEO |
- |
| M1 |
7.000 |
| K1 |
12.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2026-06-08T13:11:13.603200Z |
| Discovery magnitude (MPC) |
20.06 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2026-07-14.0000000 |
| e |
0.99388909 |
| q (au) |
4.878708 |
| a (au) |
798.360150 |
| i (deg) |
67.264673 |
| Ω (om, deg) |
130.503287 |
| ω (w, deg) |
200.616222 |
| M (ma, deg) |
359.988137 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.345 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.345 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.771 |
| 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 |
20:00:37.83 |
-15:24:41.1 |
HIP 98488 |
28.59 |
| 2026-09-20 12:00 |
20:00:33.32 |
-15:29:06.8 |
HIP 98488 |
24.11 |
| 2026-09-21 00:00 |
20:00:29.02 |
-15:33:31.4 |
HIP 98488 |
19.69 |
| 2026-09-21 12:00 |
20:00:24.92 |
-15:37:54.8 |
HIP 98488 |
15.35 |
| 2026-09-22 00:00 |
20:00:21.02 |
-15:42:17.2 |
HIP 98488 |
11.13 |
| 2026-09-22 12:00 |
20:00:17.32 |
-15:46:38.4 |
HIP 98488 |
7.24 |
| 2026-09-23 00:00 |
20:00:13.83 |
-15:50:58.5 |
HIP 98488 |
4.47 |
| 2026-09-23 12:00 |
20:00:10.54 |
-15:55:17.4 |
HIP 98488 |
5.10 |
| 2026-09-24 00:00 |
20:00:07.45 |
-15:59:35.3 |
HIP 98488 |
8.35 |
| 2026-09-24 12:00 |
20:00:04.57 |
-16:03:51.9 |
HIP 98488 |
12.27 |
| 2026-09-25 00:00 |
20:00:01.89 |
-16:08:07.5 |
HIP 98488 |
16.36 |
| 2026-09-25 12:00 |
19:59:59.41 |
-16:12:21.8 |
HIP 98488 |
20.50 |
| 2026-09-26 00:00 |
19:59:57.15 |
-16:16:35.1 |
HIP 98488 |
24.66 |
| 2026-09-26 12:00 |
19:59:55.08 |
-16:20:47.1 |
HIP 98555 |
22.81 |
| 2026-09-27 00:00 |
19:59:53.22 |
-16:24:58.0 |
HIP 98555 |
21.05 |
| 2026-09-27 12:00 |
19:59:51.57 |
-16:29:07.7 |
HIP 98555 |
20.00 |
| 2026-09-28 00:00 |
19:59:50.12 |
-16:33:16.2 |
HIP 98555 |
19.74 |
| 2026-09-28 12:00 |
19:59:48.88 |
-16:37:23.6 |
HIP 98555 |
20.29 |
| 2026-09-29 00:00 |
19:59:47.84 |
-16:41:29.8 |
HIP 98555 |
21.59 |
| 2026-09-29 12:00 |
19:59:47.01 |
-16:45:34.7 |
HIP 98555 |
23.48 |
| 2026-09-30 00:00 |
19:59:46.39 |
-16:49:38.5 |
HIP 98589 |
25.56 |
| 2026-09-30 12:00 |
19:59:45.97 |
-16:53:41.1 |
HIP 98589 |
25.58 |
| 2026-10-01 00:00 |
19:59:45.76 |
-16:57:42.5 |
HIP 98589 |
26.18 |
| 2026-10-01 12:00 |
19:59:45.76 |
-17:01:42.7 |
HIP 98589 |
27.31 |
| 2026-10-02 00:00 |
19:59:45.97 |
-17:05:41.7 |
HIP 98589 |
28.90 |
| 2026-10-02 12:00 |
19:59:46.38 |
-17:09:39.5 |
HIP 98589 |
30.88 |
| 2026-10-03 00:00 |
19:59:47.00 |
-17:13:36.0 |
HIP 98589 |
33.16 |
| 2026-10-03 12:00 |
19:59:47.82 |
-17:17:31.4 |
HIP 98623 |
33.38 |
| 2026-10-04 00:00 |
19:59:48.86 |
-17:21:25.5 |
HIP 98623 |
31.52 |
| 2026-10-04 12:00 |
19:59:50.10 |
-17:25:18.4 |
HIP 98623 |
30.02 |
| 2026-10-05 00:00 |
19:59:51.55 |
-17:29:10.1 |
HIP 98623 |
28.92 |
| 2026-10-05 12:00 |
19:59:53.20 |
-17:33:00.6 |
HIP 98361 |
27.32 |
| 2026-10-06 00:00 |
19:59:55.07 |
-17:36:49.8 |
HIP 98361 |
24.16 |
| 2026-10-06 12:00 |
19:59:57.14 |
-17:40:37.8 |
HIP 98361 |
21.29 |
| 2026-10-07 00:00 |
19:59:59.42 |
-17:44:24.6 |
HIP 98361 |
18.81 |
| 2026-10-07 12:00 |
20:00:01.91 |
-17:48:10.1 |
HIP 98361 |
16.89 |
| 2026-10-08 00:00 |
20:00:04.61 |
-17:51:54.5 |
HIP 98361 |
15.72 |
| 2026-10-08 12:00 |
20:00:07.51 |
-17:55:37.5 |
HIP 98361 |
15.48 |
| 2026-10-09 00:00 |
20:00:10.62 |
-17:59:19.4 |
HIP 98361 |
16.19 |
| 2026-10-09 12:00 |
20:00:13.94 |
-18:03:00.0 |
HIP 98502 |
15.87 |
| 2026-10-10 00:00 |
20:00:17.47 |
-18:06:39.3 |
HIP 98502 |
12.23 |
| 2026-10-10 12:00 |
20:00:21.20 |
-18:10:17.4 |
HIP 98502 |
8.67 |
| 2026-10-11 00:00 |
20:00:25.14 |
-18:13:54.3 |
HIP 98502 |
5.34 |