| Parameter |
Value |
| Designation |
C/2026 O1 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2027-07-18T09:41:48.183360Z |
| Orbit solution date (soln_date, UTC) |
2026-10-01T13:12:08Z |
| Obs used |
190 |
| NEO |
- |
| M1 |
7.000 |
| K1 |
14.750 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2026-07-19T14:02:20.284800Z |
| Discovery magnitude (MPC) |
20.37 w |
| Discovery observatory (MPC) |
F52 · Pan-STARRS 2, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2026-08-24.0000000 |
| e |
1.00095039 |
| q (au) |
1.499713 |
| a (au) |
-1578.001040 |
| i (deg) |
137.252244 |
| Ω (om, deg) |
177.923246 |
| ω (w, deg) |
304.412735 |
| M (ma, deg) |
-0.005164 |
Magnitude
Scatter + Global Linear
$$
M_a = (13.983 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.983 |
| n |
2.000 |
| gf |
0.999 |
| gb |
-0.836 |
| k |
0.993 |
| 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) |
| 2026-09-25 00:00 |
22:59:53.81 |
-26:02:44.2 |
HIP 113579 |
8.62 |
| 2026-09-25 12:00 |
22:59:05.77 |
-26:09:21.3 |
HIP 113579 |
16.48 |
| 2026-09-26 00:00 |
22:58:17.73 |
-26:15:55.4 |
HIP 113386 |
11.57 |
| 2026-09-26 12:00 |
22:57:29.69 |
-26:22:26.6 |
HIP 113332 |
14.09 |
| 2026-09-27 00:00 |
22:56:41.67 |
-26:28:54.6 |
HIP 113238 |
15.10 |
| 2026-09-27 12:00 |
22:55:53.68 |
-26:35:19.6 |
HIP 113238 |
4.17 |
| 2026-09-28 00:00 |
22:55:05.71 |
-26:41:41.4 |
HIP 113238 |
10.91 |
| 2026-09-28 12:00 |
22:54:17.77 |
-26:48:00.0 |
HIP 113161 |
16.40 |
| 2026-09-29 00:00 |
22:53:29.88 |
-26:54:15.5 |
HIP 113161 |
20.64 |
| 2026-09-29 12:00 |
22:52:42.04 |
-27:00:27.6 |
HIP 112991 |
14.70 |
| 2026-09-30 00:00 |
22:51:54.25 |
-27:06:36.5 |
HIP 112991 |
16.58 |
| 2026-09-30 12:00 |
22:51:06.53 |
-27:12:42.0 |
HIP 112824 |
5.26 |
| 2026-10-01 00:00 |
22:50:18.89 |
-27:18:44.2 |
HIP 112824 |
7.92 |
| 2026-10-01 12:00 |
22:49:31.32 |
-27:24:43.0 |
HIP 112612 |
16.71 |
| 2026-10-02 00:00 |
22:48:43.84 |
-27:30:38.3 |
HIP 112612 |
4.72 |
| 2026-10-02 12:00 |
22:47:56.45 |
-27:36:30.2 |
HIP 112612 |
7.52 |
| 2026-10-03 00:00 |
22:47:09.17 |
-27:42:18.7 |
HIP 112612 |
19.44 |
| 2026-10-03 12:00 |
22:46:21.99 |
-27:48:03.6 |
HIP 112510 |
28.59 |
| 2026-10-04 00:00 |
22:45:34.93 |
-27:53:45.0 |
HIP 112176 |
35.28 |
| 2026-10-04 12:00 |
22:44:47.99 |
-27:59:22.8 |
HIP 112176 |
23.50 |
| 2026-10-05 00:00 |
22:44:01.18 |
-28:04:57.0 |
HIP 112176 |
11.82 |
| 2026-10-05 12:00 |
22:43:14.51 |
-28:10:27.7 |
HIP 112176 |
1.59 |
| 2026-10-06 00:00 |
22:42:27.99 |
-28:15:54.7 |
HIP 112176 |
11.67 |
| 2026-10-06 12:00 |
22:41:41.61 |
-28:21:18.0 |
HIP 112176 |
23.16 |
| 2026-10-07 00:00 |
22:40:55.40 |
-28:26:37.8 |
HIP 111882 |
16.22 |
| 2026-10-07 12:00 |
22:40:09.35 |
-28:31:53.8 |
HIP 111882 |
12.11 |
| 2026-10-08 00:00 |
22:39:23.47 |
-28:37:06.2 |
HIP 111801 |
11.53 |
| 2026-10-08 12:00 |
22:38:37.78 |
-28:42:14.8 |
HIP 111801 |
3.05 |
| 2026-10-09 00:00 |
22:37:52.27 |
-28:47:19.8 |
HIP 111692 |
4.51 |
| 2026-10-09 12:00 |
22:37:06.95 |
-28:52:21.1 |
HIP 111692 |
8.09 |
| 2026-10-10 00:00 |
22:36:21.83 |
-28:57:18.6 |
HIP 111705 |
18.47 |
| 2026-10-10 12:00 |
22:35:36.92 |
-29:02:12.4 |
HIP 111705 |
27.49 |
| 2026-10-11 00:00 |
22:34:52.23 |
-29:07:02.5 |
HIP 111311 |
25.77 |
| 2026-10-11 12:00 |
22:34:07.75 |
-29:11:48.8 |
HIP 111311 |
19.57 |
| 2026-10-12 00:00 |
22:33:23.50 |
-29:16:31.4 |
HIP 111311 |
18.30 |
| 2026-10-12 12:00 |
22:32:39.47 |
-29:21:10.3 |
HIP 111350 |
22.11 |
| 2026-10-13 00:00 |
22:31:55.69 |
-29:25:45.4 |
HIP 111076 |
23.21 |
| 2026-10-13 12:00 |
22:31:12.15 |
-29:30:16.9 |
HIP 111076 |
14.89 |
| 2026-10-14 00:00 |
22:30:28.85 |
-29:34:44.6 |
HIP 111076 |
11.17 |
| 2026-10-14 12:00 |
22:29:45.82 |
-29:39:08.6 |
HIP 111076 |
15.58 |
| 2026-10-15 00:00 |
22:29:03.04 |
-29:43:28.9 |
HIP 110996 |
17.70 |
| 2026-10-15 12:00 |
22:28:20.52 |
-29:47:45.5 |
HIP 110996 |
17.74 |
| 2026-10-16 00:00 |
22:27:38.28 |
-29:51:58.4 |
HIP 110996 |
22.83 |