| Parameter |
Value |
| Designation |
226P/Pigott-LINEAR-Kowalski |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2016-09-04T12:35:50.089920Z |
| Orbit solution date (soln_date, UTC) |
2024-07-01T08:58:31Z |
| Obs used |
1679 |
| NEO |
- |
| M1 |
10.100 |
| K1 |
21.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2019-03-24.0000000 |
| e |
0.52818078 |
| q (au) |
1.778058 |
| a (au) |
3.768516 |
| i (deg) |
44.003907 |
| Ω (om, deg) |
54.006950 |
| ω (w, deg) |
341.100239 |
| M (ma, deg) |
125.358382 |
Magnitude
Scatter + Global Linear
$$
M_a = (10.651 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
10.651 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2023-07-26 |
2024-04-12 |
+17.6275 |
-4.597 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
13:39:16.60 |
+26:00:52.7 |
HIP 66667 |
11.20 |
| 2026-05-12 12:00 |
13:38:57.28 |
+25:59:15.2 |
HIP 66667 |
14.69 |
| 2026-05-13 00:00 |
13:38:38.10 |
+25:57:35.7 |
HIP 66667 |
18.64 |
| 2026-05-13 12:00 |
13:38:19.07 |
+25:55:54.1 |
HIP 66389 |
21.81 |
| 2026-05-14 00:00 |
13:38:00.19 |
+25:54:10.4 |
HIP 66389 |
17.39 |
| 2026-05-14 12:00 |
13:37:41.47 |
+25:52:24.6 |
HIP 66389 |
13.12 |
| 2026-05-15 00:00 |
13:37:22.90 |
+25:50:36.8 |
HIP 66389 |
9.17 |
| 2026-05-15 12:00 |
13:37:04.49 |
+25:48:46.9 |
HIP 66389 |
6.18 |
| 2026-05-16 00:00 |
13:36:46.24 |
+25:46:55.0 |
HIP 66389 |
5.80 |
| 2026-05-16 12:00 |
13:36:28.16 |
+25:45:01.1 |
HIP 66389 |
8.36 |
| 2026-05-17 00:00 |
13:36:10.23 |
+25:43:05.3 |
HIP 66389 |
12.12 |
| 2026-05-17 12:00 |
13:35:52.47 |
+25:41:07.4 |
HIP 66389 |
16.24 |
| 2026-05-18 00:00 |
13:35:34.88 |
+25:39:07.6 |
HIP 66389 |
20.49 |
| 2026-05-18 12:00 |
13:35:17.46 |
+25:37:05.8 |
HIP 66389 |
24.80 |
| 2026-05-19 00:00 |
13:35:00.21 |
+25:35:02.1 |
HIP 66389 |
29.13 |
| 2026-05-19 12:00 |
13:34:43.13 |
+25:32:56.5 |
HIP 66112 |
29.15 |
| 2026-05-20 00:00 |
13:34:26.22 |
+25:30:49.0 |
HIP 66112 |
28.12 |
| 2026-05-20 12:00 |
13:34:09.49 |
+25:28:39.6 |
HIP 66112 |
27.79 |
| 2026-05-21 00:00 |
13:33:52.94 |
+25:26:28.3 |
HIP 66112 |
28.18 |
| 2026-05-21 12:00 |
13:33:36.56 |
+25:24:15.3 |
HIP 66112 |
29.24 |
| 2026-05-22 00:00 |
13:33:20.37 |
+25:22:00.3 |
HIP 66112 |
30.91 |
| 2026-05-22 12:00 |
13:33:04.35 |
+25:19:43.6 |
HIP 66237 |
31.33 |
| 2026-05-23 00:00 |
13:32:48.52 |
+25:17:25.1 |
HIP 66237 |
32.01 |
| 2026-05-23 12:00 |
13:32:32.87 |
+25:15:04.9 |
HIP 66237 |
33.17 |
| 2026-05-24 00:00 |
13:32:17.40 |
+25:12:42.9 |
HIP 66237 |
34.77 |
| 2026-05-24 12:00 |
13:32:02.12 |
+25:10:19.1 |
HIP 66237 |
36.74 |
| 2026-05-25 00:00 |
13:31:47.02 |
+25:07:53.7 |
HIP 66237 |
39.02 |
| 2026-05-25 12:00 |
13:31:32.11 |
+25:05:26.5 |
HIP 66237 |
41.55 |
| 2026-05-26 00:00 |
13:31:17.39 |
+25:02:57.7 |
HIP 66237 |
44.28 |
| 2026-05-26 12:00 |
13:31:02.86 |
+25:00:27.2 |
HIP 65921 |
46.26 |
| 2026-05-27 00:00 |
13:30:48.52 |
+24:57:55.1 |
HIP 65921 |
43.67 |
| 2026-05-27 12:00 |
13:30:34.36 |
+24:55:21.4 |
HIP 65921 |
41.30 |
| 2026-05-28 00:00 |
13:30:20.40 |
+24:52:46.1 |
HIP 65648 |
38.63 |
| 2026-05-28 12:00 |
13:30:06.63 |
+24:50:09.2 |
HIP 65648 |
36.25 |
| 2026-05-29 00:00 |
13:29:53.06 |
+24:47:30.7 |
HIP 65648 |
34.23 |
| 2026-05-29 12:00 |
13:29:39.67 |
+24:44:50.7 |
HIP 65648 |
32.65 |
| 2026-05-30 00:00 |
13:29:26.48 |
+24:42:09.2 |
HIP 65661 |
29.21 |
| 2026-05-30 12:00 |
13:29:13.48 |
+24:39:26.1 |
HIP 65661 |
25.22 |
| 2026-05-31 00:00 |
13:29:00.68 |
+24:36:41.6 |
HIP 65661 |
21.25 |
| 2026-05-31 12:00 |
13:28:48.07 |
+24:33:55.5 |
HIP 65661 |
17.31 |
| 2026-06-01 00:00 |
13:28:35.66 |
+24:31:08.0 |
HIP 65661 |
13.44 |
| 2026-06-01 12:00 |
13:28:23.44 |
+24:28:19.1 |
HIP 65661 |
9.66 |
| 2026-06-02 00:00 |
13:28:11.42 |
+24:25:28.8 |
HIP 65661 |
6.15 |