P/2019 A3 (PANSTARRS)
| Parameter |
Value |
| Designation |
P/2019 A3 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-08-01T21:04:24.133440Z |
| Orbit solution date (soln_date, UTC) |
2022-06-20T23:13:36Z |
| Obs used |
66 |
| NEO |
- |
| M1 |
19.100 |
| K1 |
5.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-01-03T06:27:04.320000Z |
| Discovery magnitude (MPC) |
21.90 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2020-01-04.0000000 |
| e |
0.26518544 |
| q (au) |
2.312949 |
| a (au) |
3.147663 |
| i (deg) |
15.365067 |
| Ω (om, deg) |
31.323079 |
| ω (w, deg) |
325.480485 |
| M (ma, deg) |
91.796650 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.551 + 5.118\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.551 |
| n |
5.118 |
| gf |
0.999 |
| gb |
-0.907 |
| k |
0.996 |
| δ90 |
1.000 |
| 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) |
| 2026-02-03 00:00 |
10:22:02.55 |
+30:53:31.1 |
HIP 50852 |
13.04 |
| 2026-02-03 12:00 |
10:21:38.16 |
+30:55:48.6 |
HIP 50852 |
18.70 |
| 2026-02-04 00:00 |
10:21:13.60 |
+30:58:04.6 |
HIP 50673 |
18.87 |
| 2026-02-04 12:00 |
10:20:48.89 |
+31:00:19.2 |
HIP 50673 |
20.50 |
| 2026-02-05 00:00 |
10:20:24.02 |
+31:02:32.3 |
HIP 50654 |
23.44 |
| 2026-02-05 12:00 |
10:19:59.00 |
+31:04:43.8 |
HIP 50654 |
22.80 |
| 2026-02-06 00:00 |
10:19:33.84 |
+31:06:53.8 |
HIP 50654 |
23.63 |
| 2026-02-06 12:00 |
10:19:08.54 |
+31:09:02.2 |
HIP 50410 |
25.45 |
| 2026-02-07 00:00 |
10:18:43.11 |
+31:11:08.9 |
HIP 50410 |
23.04 |
| 2026-02-07 12:00 |
10:18:17.55 |
+31:13:14.0 |
HIP 50410 |
21.94 |
| 2026-02-08 00:00 |
10:17:51.87 |
+31:15:17.3 |
HIP 50410 |
22.33 |
| 2026-02-08 12:00 |
10:17:26.07 |
+31:17:19.0 |
HIP 50410 |
24.17 |
| 2026-02-09 00:00 |
10:17:00.16 |
+31:19:18.8 |
HIP 50218 |
25.82 |
| 2026-02-09 12:00 |
10:16:34.15 |
+31:21:16.8 |
HIP 50218 |
19.93 |
| 2026-02-10 00:00 |
10:16:08.03 |
+31:23:13.0 |
HIP 50218 |
14.03 |
| 2026-02-10 12:00 |
10:15:41.83 |
+31:25:07.3 |
HIP 50218 |
8.12 |
| 2026-02-11 00:00 |
10:15:15.53 |
+31:26:59.6 |
HIP 50218 |
2.24 |
| 2026-02-11 12:00 |
10:14:49.16 |
+31:28:50.1 |
HIP 50218 |
3.74 |
| 2026-02-12 00:00 |
10:14:22.71 |
+31:30:38.6 |
HIP 50136 |
4.66 |
| 2026-02-12 12:00 |
10:13:56.19 |
+31:32:25.0 |
HIP 50136 |
2.58 |
| 2026-02-13 00:00 |
10:13:29.60 |
+31:34:09.5 |
HIP 50136 |
7.87 |
| 2026-02-13 12:00 |
10:13:02.96 |
+31:35:51.9 |
HIP 50059 |
13.44 |
| 2026-02-14 00:00 |
10:12:36.26 |
+31:37:32.2 |
HIP 50059 |
17.01 |
| 2026-02-14 12:00 |
10:12:09.52 |
+31:39:10.4 |
HIP 50059 |
21.63 |
| 2026-02-15 00:00 |
10:11:42.74 |
+31:40:46.4 |
HIP 50059 |
26.74 |
| 2026-02-15 12:00 |
10:11:15.93 |
+31:42:20.3 |
HIP 49770 |
23.19 |
| 2026-02-16 00:00 |
10:10:49.09 |
+31:43:52.0 |
HIP 49770 |
18.50 |
| 2026-02-16 12:00 |
10:10:22.23 |
+31:45:21.5 |
HIP 49770 |
14.69 |
| 2026-02-17 00:00 |
10:09:55.36 |
+31:46:48.7 |
HIP 49770 |
12.59 |
| 2026-02-17 12:00 |
10:09:28.48 |
+31:48:13.7 |
HIP 49770 |
13.02 |
| 2026-02-18 00:00 |
10:09:01.60 |
+31:49:36.4 |
HIP 49770 |
15.78 |
| 2026-02-18 12:00 |
10:08:34.72 |
+31:50:56.8 |
HIP 49658 |
15.22 |
| 2026-02-19 00:00 |
10:08:07.86 |
+31:52:14.8 |
HIP 49658 |
16.08 |
| 2026-02-19 12:00 |
10:07:41.01 |
+31:53:30.5 |
HIP 49658 |
18.78 |
| 2026-02-20 00:00 |
10:07:14.19 |
+31:54:43.9 |
HIP 49658 |
22.66 |
| 2026-02-20 12:00 |
10:06:47.39 |
+31:55:54.9 |
HIP 49658 |
27.21 |
| 2026-02-21 00:00 |
10:06:20.64 |
+31:57:03.4 |
HIP 49658 |
32.14 |
| 2026-02-21 12:00 |
10:05:53.93 |
+31:58:09.6 |
HIP 49334 |
35.62 |
| 2026-02-22 00:00 |
10:05:27.26 |
+31:59:13.4 |
HIP 49334 |
31.73 |
| 2026-02-22 12:00 |
10:05:00.65 |
+32:00:14.7 |
HIP 49334 |
28.51 |
| 2026-02-23 00:00 |
10:04:34.11 |
+32:01:13.5 |
HIP 49334 |
26.20 |
| 2026-02-23 12:00 |
10:04:07.63 |
+32:02:09.9 |
HIP 49334 |
25.05 |
| 2026-02-24 00:00 |
10:03:41.22 |
+32:03:03.9 |
HIP 49334 |
25.19 |