419P/PANSTARRS
| Parameter |
Value |
| Designation |
419P/PANSTARRS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-03-15T12:20:00.761280Z |
| Orbit solution date (soln_date, UTC) |
2023-10-29T03:13:38Z |
| Obs used |
297 |
| NEO |
- |
| M1 |
7.300 |
| K1 |
23.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2017-06-11.0000000 |
| e |
0.27849867 |
| q (au) |
2.542241 |
| a (au) |
3.523542 |
| i (deg) |
2.804422 |
| Ω (om, deg) |
40.425087 |
| ω (w, deg) |
187.263454 |
| M (ma, deg) |
121.968066 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.031 + 2.720\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.031 |
| n |
2.720 |
| gf |
0.999 |
| gb |
-0.904 |
| k |
0.999 |
| 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) |
| 2026-02-03 00:00 |
04:23:29.07 |
+23:38:29.2 |
HIP 20631 |
26.69 |
| 2026-02-03 12:00 |
04:23:28.42 |
+23:38:21.4 |
HIP 20631 |
26.87 |
| 2026-02-04 00:00 |
04:23:28.04 |
+23:38:14.1 |
HIP 20631 |
27.00 |
| 2026-02-04 12:00 |
04:23:27.94 |
+23:38:07.3 |
HIP 20631 |
27.06 |
| 2026-02-05 00:00 |
04:23:28.10 |
+23:38:01.2 |
HIP 20631 |
27.06 |
| 2026-02-05 12:00 |
04:23:28.54 |
+23:37:55.7 |
HIP 20631 |
26.99 |
| 2026-02-06 00:00 |
04:23:29.24 |
+23:37:50.7 |
HIP 20631 |
26.87 |
| 2026-02-06 12:00 |
04:23:30.22 |
+23:37:46.3 |
HIP 20631 |
26.69 |
| 2026-02-07 00:00 |
04:23:31.46 |
+23:37:42.5 |
HIP 20631 |
26.45 |
| 2026-02-07 12:00 |
04:23:32.97 |
+23:37:39.3 |
HIP 20631 |
26.14 |
| 2026-02-08 00:00 |
04:23:34.75 |
+23:37:36.6 |
HIP 20631 |
25.78 |
| 2026-02-08 12:00 |
04:23:36.80 |
+23:37:34.6 |
HIP 20631 |
25.36 |
| 2026-02-09 00:00 |
04:23:39.12 |
+23:37:33.1 |
HIP 20631 |
24.88 |
| 2026-02-09 12:00 |
04:23:41.70 |
+23:37:32.2 |
HIP 20631 |
24.35 |
| 2026-02-10 00:00 |
04:23:44.55 |
+23:37:31.9 |
HIP 20631 |
23.75 |
| 2026-02-10 12:00 |
04:23:47.66 |
+23:37:32.1 |
HIP 20631 |
23.10 |
| 2026-02-11 00:00 |
04:23:51.04 |
+23:37:33.0 |
HIP 20631 |
22.40 |
| 2026-02-11 12:00 |
04:23:54.68 |
+23:37:34.4 |
HIP 20631 |
21.64 |
| 2026-02-12 00:00 |
04:23:58.58 |
+23:37:36.4 |
HIP 20631 |
20.83 |
| 2026-02-12 12:00 |
04:24:02.75 |
+23:37:38.9 |
HIP 20631 |
19.97 |
| 2026-02-13 00:00 |
04:24:07.18 |
+23:37:42.1 |
HIP 20631 |
19.06 |
| 2026-02-13 12:00 |
04:24:11.87 |
+23:37:45.8 |
HIP 20631 |
18.11 |
| 2026-02-14 00:00 |
04:24:16.82 |
+23:37:50.1 |
HIP 20631 |
17.11 |
| 2026-02-14 12:00 |
04:24:22.03 |
+23:37:54.9 |
HIP 20631 |
16.09 |
| 2026-02-15 00:00 |
04:24:27.51 |
+23:38:00.3 |
HIP 20644 |
15.01 |
| 2026-02-15 12:00 |
04:24:33.23 |
+23:38:06.3 |
HIP 20644 |
13.78 |
| 2026-02-16 00:00 |
04:24:39.22 |
+23:38:12.8 |
HIP 20644 |
12.52 |
| 2026-02-16 12:00 |
04:24:45.46 |
+23:38:19.9 |
HIP 20644 |
11.23 |
| 2026-02-17 00:00 |
04:24:51.96 |
+23:38:27.5 |
HIP 20644 |
9.92 |
| 2026-02-17 12:00 |
04:24:58.71 |
+23:38:35.7 |
HIP 20644 |
8.63 |
| 2026-02-18 00:00 |
04:25:05.72 |
+23:38:44.5 |
HIP 20644 |
7.39 |
| 2026-02-18 12:00 |
04:25:12.98 |
+23:38:53.8 |
HIP 20644 |
6.29 |
| 2026-02-19 00:00 |
04:25:20.49 |
+23:39:03.6 |
HIP 20644 |
5.45 |
| 2026-02-19 12:00 |
04:25:28.25 |
+23:39:13.9 |
HIP 20644 |
5.07 |
| 2026-02-20 00:00 |
04:25:36.26 |
+23:39:24.8 |
HIP 20644 |
5.32 |
| 2026-02-20 12:00 |
04:25:44.52 |
+23:39:36.3 |
HIP 20644 |
6.17 |
| 2026-02-21 00:00 |
04:25:53.03 |
+23:39:48.2 |
HIP 20644 |
7.46 |
| 2026-02-21 12:00 |
04:26:01.78 |
+23:40:00.7 |
HIP 20644 |
9.04 |
| 2026-02-22 00:00 |
04:26:10.78 |
+23:40:13.7 |
HIP 20644 |
10.81 |
| 2026-02-22 12:00 |
04:26:20.02 |
+23:40:27.2 |
HIP 20644 |
12.73 |
| 2026-02-23 00:00 |
04:26:29.51 |
+23:40:41.2 |
HIP 20644 |
14.75 |
| 2026-02-23 12:00 |
04:26:39.23 |
+23:40:55.7 |
HIP 20644 |
16.87 |
| 2026-02-24 00:00 |
04:26:49.20 |
+23:41:10.7 |
HIP 20644 |
19.07 |