| Parameter |
Value |
| Designation |
146P/Shoemaker-LINEAR |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2024-08-05T08:53:48.851520Z |
| Orbit solution date (soln_date, UTC) |
2025-05-09T00:50:37Z |
| Obs used |
660 |
| NEO |
- |
| M1 |
12.200 |
| K1 |
21.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2022-04-07.0000000 |
| e |
0.64733427 |
| q (au) |
1.421549 |
| a (au) |
4.030867 |
| i (deg) |
23.109042 |
| Ω (om, deg) |
53.379790 |
| ω (w, deg) |
316.990390 |
| M (ma, deg) |
256.312817 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.467 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.467 |
| 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 |
| 2024-05-06 |
2024-08-05 |
+10.3090 |
-2.699 |
| 2024-08-06 |
2024-10-12 |
+42.9787 |
-7.408 |
| 2024-10-12 |
2025-05-01 |
-11.2690 |
+3.718 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
10:29:56.58 |
+32:58:59.9 |
HIP 51337 |
9.87 |
| 2026-06-01 12:00 |
10:30:06.65 |
+32:55:52.6 |
HIP 51471 |
8.94 |
| 2026-06-02 00:00 |
10:30:16.88 |
+32:52:45.1 |
HIP 51471 |
7.28 |
| 2026-06-02 12:00 |
10:30:27.26 |
+32:49:37.3 |
HIP 51471 |
7.38 |
| 2026-06-03 00:00 |
10:30:37.80 |
+32:46:29.3 |
HIP 51471 |
9.22 |
| 2026-06-03 12:00 |
10:30:48.50 |
+32:43:21.1 |
HIP 51471 |
12.05 |
| 2026-06-04 00:00 |
10:30:59.35 |
+32:40:12.7 |
HIP 51471 |
15.34 |
| 2026-06-04 12:00 |
10:31:10.35 |
+32:37:04.1 |
HIP 51556 |
16.71 |
| 2026-06-05 00:00 |
10:31:21.50 |
+32:33:55.2 |
HIP 51556 |
12.80 |
| 2026-06-05 12:00 |
10:31:32.80 |
+32:30:46.2 |
HIP 51556 |
8.90 |
| 2026-06-06 00:00 |
10:31:44.25 |
+32:27:36.9 |
HIP 51556 |
5.07 |
| 2026-06-06 12:00 |
10:31:55.85 |
+32:24:27.5 |
HIP 51556 |
1.93 |
| 2026-06-07 00:00 |
10:32:07.59 |
+32:21:17.9 |
HIP 51556 |
3.73 |
| 2026-06-07 12:00 |
10:32:19.48 |
+32:18:08.1 |
HIP 51556 |
7.54 |
| 2026-06-08 00:00 |
10:32:31.52 |
+32:14:58.1 |
HIP 51556 |
11.53 |
| 2026-06-08 12:00 |
10:32:43.69 |
+32:11:48.0 |
HIP 51556 |
15.58 |
| 2026-06-09 00:00 |
10:32:56.01 |
+32:08:37.7 |
HIP 51556 |
19.67 |
| 2026-06-09 12:00 |
10:33:08.47 |
+32:05:27.2 |
HIP 51556 |
23.79 |
| 2026-06-10 00:00 |
10:33:21.07 |
+32:02:16.6 |
HIP 51758 |
26.04 |
| 2026-06-10 12:00 |
10:33:33.81 |
+31:59:05.9 |
HIP 51758 |
21.90 |
| 2026-06-11 00:00 |
10:33:46.69 |
+31:55:55.0 |
HIP 51758 |
17.75 |
| 2026-06-11 12:00 |
10:33:59.70 |
+31:52:44.0 |
HIP 51758 |
13.60 |
| 2026-06-12 00:00 |
10:34:12.85 |
+31:49:32.9 |
HIP 51758 |
9.50 |
| 2026-06-12 12:00 |
10:34:26.13 |
+31:46:21.6 |
HIP 51758 |
5.61 |
| 2026-06-13 00:00 |
10:34:39.55 |
+31:43:10.2 |
HIP 51758 |
3.01 |
| 2026-06-13 12:00 |
10:34:53.10 |
+31:39:58.7 |
HIP 51758 |
4.85 |
| 2026-06-14 00:00 |
10:35:06.77 |
+31:36:47.1 |
HIP 51758 |
8.68 |
| 2026-06-14 12:00 |
10:35:20.58 |
+31:33:35.4 |
HIP 51758 |
12.86 |
| 2026-06-15 00:00 |
10:35:34.52 |
+31:30:23.6 |
HIP 51840 |
16.36 |
| 2026-06-15 12:00 |
10:35:48.58 |
+31:27:11.8 |
HIP 51840 |
19.96 |
| 2026-06-16 00:00 |
10:36:02.78 |
+31:23:59.8 |
HIP 51999 |
19.56 |
| 2026-06-16 12:00 |
10:36:17.09 |
+31:20:47.8 |
HIP 51999 |
18.78 |
| 2026-06-17 00:00 |
10:36:31.53 |
+31:17:35.7 |
HIP 51999 |
19.02 |
| 2026-06-17 12:00 |
10:36:46.09 |
+31:14:23.5 |
HIP 51999 |
20.24 |
| 2026-06-18 00:00 |
10:37:00.78 |
+31:11:11.3 |
HIP 51999 |
22.29 |
| 2026-06-18 12:00 |
10:37:15.58 |
+31:07:59.1 |
HIP 51999 |
24.99 |
| 2026-06-19 00:00 |
10:37:30.50 |
+31:04:46.8 |
HIP 51999 |
28.15 |
| 2026-06-19 12:00 |
10:37:45.54 |
+31:01:34.5 |
HIP 52184 |
25.32 |
| 2026-06-20 00:00 |
10:38:00.70 |
+30:58:22.1 |
HIP 52184 |
21.45 |
| 2026-06-20 12:00 |
10:38:15.97 |
+30:55:09.7 |
HIP 52184 |
17.87 |
| 2026-06-21 00:00 |
10:38:31.35 |
+30:51:57.3 |
HIP 52184 |
14.84 |
| 2026-06-21 12:00 |
10:38:46.85 |
+30:48:44.9 |
HIP 52184 |
12.75 |
| 2026-06-22 00:00 |
10:39:02.46 |
+30:45:32.5 |
HIP 52184 |
12.13 |