| 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
$$
M_a = (3.797 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
3.797 |
| n |
6.000 |
| gf |
0.981 |
| gb |
-0.996 |
| k |
1.000 |
| δ90 |
9.868 |
| 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) |
| 2026-05-12 00:00 |
07:50:39.76 |
+19:57:58.7 |
HIP 38163 |
23.47 |
| 2026-05-12 12:00 |
07:50:37.46 |
+19:57:16.4 |
HIP 38163 |
22.65 |
| 2026-05-13 00:00 |
07:50:35.31 |
+19:56:33.7 |
HIP 38163 |
21.87 |
| 2026-05-13 12:00 |
07:50:33.31 |
+19:55:50.7 |
HIP 38163 |
21.12 |
| 2026-05-14 00:00 |
07:50:31.45 |
+19:55:07.4 |
HIP 38163 |
20.40 |
| 2026-05-14 12:00 |
07:50:29.73 |
+19:54:23.8 |
HIP 38163 |
19.73 |
| 2026-05-15 00:00 |
07:50:28.16 |
+19:53:39.8 |
HIP 38163 |
19.09 |
| 2026-05-15 12:00 |
07:50:26.73 |
+19:52:55.6 |
HIP 38163 |
18.50 |
| 2026-05-16 00:00 |
07:50:25.45 |
+19:52:11.0 |
HIP 38163 |
17.96 |
| 2026-05-16 12:00 |
07:50:24.30 |
+19:51:26.2 |
HIP 38163 |
17.47 |
| 2026-05-17 00:00 |
07:50:23.30 |
+19:50:41.0 |
HIP 38163 |
17.03 |
| 2026-05-17 12:00 |
07:50:22.43 |
+19:49:55.5 |
HIP 38163 |
16.64 |
| 2026-05-18 00:00 |
07:50:21.70 |
+19:49:09.7 |
HIP 38163 |
16.32 |
| 2026-05-18 12:00 |
07:50:21.10 |
+19:48:23.6 |
HIP 38163 |
16.06 |
| 2026-05-19 00:00 |
07:50:20.64 |
+19:47:37.2 |
HIP 38163 |
15.86 |
| 2026-05-19 12:00 |
07:50:20.31 |
+19:46:50.5 |
HIP 38163 |
15.73 |
| 2026-05-20 00:00 |
07:50:20.12 |
+19:46:03.5 |
HIP 38163 |
15.68 |
| 2026-05-20 12:00 |
07:50:20.06 |
+19:45:16.2 |
HIP 38163 |
15.69 |
| 2026-05-21 00:00 |
07:50:20.12 |
+19:44:28.6 |
HIP 38163 |
15.77 |
| 2026-05-21 12:00 |
07:50:20.32 |
+19:43:40.7 |
HIP 38163 |
15.92 |
| 2026-05-22 00:00 |
07:50:20.64 |
+19:42:52.6 |
HIP 38163 |
16.14 |
| 2026-05-22 12:00 |
07:50:21.09 |
+19:42:04.1 |
HIP 38163 |
16.43 |
| 2026-05-23 00:00 |
07:50:21.66 |
+19:41:15.4 |
HIP 38163 |
16.78 |
| 2026-05-23 12:00 |
07:50:22.36 |
+19:40:26.3 |
HIP 38252 |
16.14 |
| 2026-05-24 00:00 |
07:50:23.18 |
+19:39:37.0 |
HIP 38252 |
15.36 |
| 2026-05-24 12:00 |
07:50:24.12 |
+19:38:47.5 |
HIP 38252 |
14.60 |
| 2026-05-25 00:00 |
07:50:25.18 |
+19:37:57.6 |
HIP 38252 |
13.85 |
| 2026-05-25 12:00 |
07:50:26.36 |
+19:37:07.5 |
HIP 38252 |
13.12 |
| 2026-05-26 00:00 |
07:50:27.66 |
+19:36:17.0 |
HIP 38252 |
12.41 |
| 2026-05-26 12:00 |
07:50:29.07 |
+19:35:26.3 |
HIP 38252 |
11.74 |
| 2026-05-27 00:00 |
07:50:30.60 |
+19:34:35.4 |
HIP 38252 |
11.11 |
| 2026-05-27 12:00 |
07:50:32.25 |
+19:33:44.1 |
HIP 38252 |
10.52 |
| 2026-05-28 00:00 |
07:50:34.00 |
+19:32:52.6 |
HIP 38252 |
10.01 |
| 2026-05-28 12:00 |
07:50:35.88 |
+19:32:00.9 |
HIP 38252 |
9.57 |
| 2026-05-29 00:00 |
07:50:37.86 |
+19:31:08.8 |
HIP 38252 |
9.23 |
| 2026-05-29 12:00 |
07:50:39.95 |
+19:30:16.5 |
HIP 38252 |
9.00 |
| 2026-05-30 00:00 |
07:50:42.15 |
+19:29:23.9 |
HIP 38252 |
8.90 |
| 2026-05-30 12:00 |
07:50:44.46 |
+19:28:31.1 |
HIP 38252 |
8.94 |
| 2026-05-31 00:00 |
07:50:46.88 |
+19:27:38.0 |
HIP 38252 |
9.12 |
| 2026-05-31 12:00 |
07:50:49.41 |
+19:26:44.6 |
HIP 38252 |
9.44 |
| 2026-06-01 00:00 |
07:50:52.03 |
+19:25:51.0 |
HIP 38252 |
9.88 |
| 2026-06-01 12:00 |
07:50:54.77 |
+19:24:57.1 |
HIP 38252 |
10.45 |
| 2026-06-02 00:00 |
07:50:57.60 |
+19:24:03.0 |
HIP 38252 |
11.12 |