| Parameter |
Value |
| Designation |
C/2026 A3 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2027-09-28T03:52:17.132160Z |
| Orbit solution date (soln_date, UTC) |
2026-04-14T13:42:24Z |
| Obs used |
72 |
| NEO |
- |
| M1 |
7.100 |
| K1 |
12.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2026-01-13T10:06:52.934400Z |
| Discovery magnitude (MPC) |
21.49 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2026-03-01.0000000 |
| e |
1.00160463 |
| q (au) |
4.824761 |
| a (au) |
-3006.780675 |
| i (deg) |
157.377988 |
| Ω (om, deg) |
306.994515 |
| ω (w, deg) |
238.603300 |
| M (ma, deg) |
-0.003444 |
Magnitude
Scatter + Global Linear
$$
M_a = (3.755 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
3.755 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.502 |
| 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) |
| 2026-07-29 00:00 |
08:03:17.74 |
+17:16:16.6 |
HIP 39416 |
25.52 |
| 2026-07-29 12:00 |
08:03:25.66 |
+17:14:58.2 |
HIP 39416 |
24.11 |
| 2026-07-30 00:00 |
08:03:33.57 |
+17:13:39.7 |
HIP 39416 |
22.84 |
| 2026-07-30 12:00 |
08:03:41.47 |
+17:12:21.0 |
HIP 39416 |
21.74 |
| 2026-07-31 00:00 |
08:03:49.34 |
+17:11:02.1 |
HIP 39416 |
20.83 |
| 2026-07-31 12:00 |
08:03:57.21 |
+17:09:43.1 |
HIP 39416 |
20.14 |
| 2026-08-01 00:00 |
08:04:05.05 |
+17:08:24.0 |
HIP 39416 |
19.69 |
| 2026-08-01 12:00 |
08:04:12.88 |
+17:07:04.7 |
HIP 39416 |
19.50 |
| 2026-08-02 00:00 |
08:04:20.69 |
+17:05:45.3 |
HIP 39416 |
19.57 |
| 2026-08-02 12:00 |
08:04:28.49 |
+17:04:25.7 |
HIP 39416 |
19.90 |
| 2026-08-03 00:00 |
08:04:36.26 |
+17:03:05.9 |
HIP 39416 |
20.47 |
| 2026-08-03 12:00 |
08:04:44.01 |
+17:01:46.0 |
HIP 39416 |
21.28 |
| 2026-08-04 00:00 |
08:04:51.74 |
+17:00:26.0 |
HIP 39416 |
22.28 |
| 2026-08-04 12:00 |
08:04:59.44 |
+16:59:05.8 |
HIP 39416 |
23.46 |
| 2026-08-05 00:00 |
08:05:07.12 |
+16:57:45.5 |
HIP 39416 |
24.78 |
| 2026-08-05 12:00 |
08:05:14.78 |
+16:56:25.0 |
HIP 39460 |
25.90 |
| 2026-08-06 00:00 |
08:05:22.41 |
+16:55:04.4 |
HIP 39460 |
26.41 |
| 2026-08-06 12:00 |
08:05:30.01 |
+16:53:43.7 |
HIP 39460 |
27.10 |
| 2026-08-07 00:00 |
08:05:37.58 |
+16:52:22.8 |
HIP 39460 |
27.94 |
| 2026-08-07 12:00 |
08:05:45.13 |
+16:51:01.8 |
HIP 39460 |
28.93 |
| 2026-08-08 00:00 |
08:05:52.65 |
+16:49:40.6 |
HIP 39737 |
29.48 |
| 2026-08-08 12:00 |
08:06:00.13 |
+16:48:19.3 |
HIP 39737 |
29.28 |
| 2026-08-09 00:00 |
08:06:07.58 |
+16:46:57.9 |
HIP 39737 |
29.26 |
| 2026-08-09 12:00 |
08:06:15.00 |
+16:45:36.4 |
HIP 39737 |
29.41 |
| 2026-08-10 00:00 |
08:06:22.38 |
+16:44:14.7 |
HIP 39737 |
29.74 |
| 2026-08-10 12:00 |
08:06:29.73 |
+16:42:52.9 |
HIP 39812 |
29.35 |
| 2026-08-11 00:00 |
08:06:37.04 |
+16:41:30.9 |
HIP 39812 |
27.13 |
| 2026-08-11 12:00 |
08:06:44.31 |
+16:40:08.9 |
HIP 39812 |
24.91 |
| 2026-08-12 00:00 |
08:06:51.54 |
+16:38:46.7 |
HIP 39812 |
22.70 |
| 2026-08-12 12:00 |
08:06:58.73 |
+16:37:24.4 |
HIP 39812 |
20.50 |
| 2026-08-13 00:00 |
08:07:05.88 |
+16:36:02.0 |
HIP 39812 |
18.31 |
| 2026-08-13 12:00 |
08:07:12.99 |
+16:34:39.5 |
HIP 39812 |
16.12 |
| 2026-08-14 00:00 |
08:07:20.05 |
+16:33:16.8 |
HIP 39812 |
13.94 |
| 2026-08-14 12:00 |
08:07:27.07 |
+16:31:54.1 |
HIP 39812 |
11.77 |
| 2026-08-15 00:00 |
08:07:34.05 |
+16:30:31.2 |
HIP 39812 |
9.61 |
| 2026-08-15 12:00 |
08:07:40.97 |
+16:29:08.2 |
HIP 39812 |
7.46 |
| 2026-08-16 00:00 |
08:07:47.85 |
+16:27:45.2 |
HIP 39812 |
5.32 |
| 2026-08-16 12:00 |
08:07:54.67 |
+16:26:22.0 |
HIP 39812 |
3.23 |
| 2026-08-17 00:00 |
08:08:01.45 |
+16:24:58.7 |
HIP 39812 |
1.31 |
| 2026-08-17 12:00 |
08:08:08.17 |
+16:23:35.3 |
HIP 39812 |
1.47 |
| 2026-08-18 00:00 |
08:08:14.84 |
+16:22:11.9 |
HIP 39812 |
3.41 |
| 2026-08-18 12:00 |
08:08:21.46 |
+16:20:48.3 |
HIP 39812 |
5.47 |
| 2026-08-19 00:00 |
08:08:28.02 |
+16:19:24.7 |
HIP 39812 |
7.56 |