| Parameter |
Value |
| Designation |
345P/LINEAR |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2016-07-15T10:40:53.382720Z |
| Orbit solution date (soln_date, UTC) |
2024-10-19T00:12:17Z |
| Obs used |
190 |
| NEO |
- |
| M1 |
15.500 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2016-08-23.0000000 |
| e |
0.21947831 |
| q (au) |
3.158034 |
| a (au) |
4.046055 |
| i (deg) |
2.724989 |
| Ω (om, deg) |
154.521613 |
| ω (w, deg) |
196.465742 |
| M (ma, deg) |
4.669134 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.190 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.190 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.780 |
| k |
0.800 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
07:08:18.59 |
+20:43:02.0 |
HIP 34433 |
8.92 |
| 2026-07-29 12:00 |
07:08:52.81 |
+20:42:06.5 |
HIP 34433 |
12.55 |
| 2026-07-30 00:00 |
07:09:26.96 |
+20:41:10.6 |
HIP 34433 |
19.11 |
| 2026-07-30 12:00 |
07:10:01.07 |
+20:40:14.2 |
HIP 34653 |
16.14 |
| 2026-07-31 00:00 |
07:10:35.11 |
+20:39:17.5 |
HIP 34653 |
12.80 |
| 2026-07-31 12:00 |
07:11:09.11 |
+20:38:20.3 |
HIP 34653 |
13.98 |
| 2026-08-01 00:00 |
07:11:43.04 |
+20:37:22.7 |
HIP 34653 |
18.84 |
| 2026-08-01 12:00 |
07:12:16.92 |
+20:36:24.7 |
HIP 34845 |
22.21 |
| 2026-08-02 00:00 |
07:12:50.74 |
+20:35:26.3 |
HIP 34845 |
22.79 |
| 2026-08-02 12:00 |
07:13:24.51 |
+20:34:27.5 |
HIP 35011 |
16.64 |
| 2026-08-03 00:00 |
07:13:58.22 |
+20:33:28.2 |
HIP 35011 |
8.74 |
| 2026-08-03 12:00 |
07:14:31.86 |
+20:32:28.6 |
HIP 35011 |
1.55 |
| 2026-08-04 00:00 |
07:15:05.45 |
+20:31:28.6 |
HIP 35011 |
7.37 |
| 2026-08-04 12:00 |
07:15:38.98 |
+20:30:28.2 |
HIP 35011 |
15.22 |
| 2026-08-05 00:00 |
07:16:12.45 |
+20:29:27.4 |
HIP 35280 |
21.73 |
| 2026-08-05 12:00 |
07:16:45.85 |
+20:28:26.3 |
HIP 35280 |
17.97 |
| 2026-08-06 00:00 |
07:17:19.20 |
+20:27:24.7 |
HIP 35280 |
17.27 |
| 2026-08-06 12:00 |
07:17:52.48 |
+20:26:22.8 |
HIP 35280 |
19.93 |
| 2026-08-07 00:00 |
07:18:25.70 |
+20:25:20.5 |
HIP 35510 |
19.53 |
| 2026-08-07 12:00 |
07:18:58.85 |
+20:24:17.9 |
HIP 35510 |
12.14 |
| 2026-08-08 00:00 |
07:19:31.94 |
+20:23:14.8 |
HIP 35510 |
6.04 |
| 2026-08-08 12:00 |
07:20:04.96 |
+20:22:11.5 |
HIP 35510 |
6.92 |
| 2026-08-09 00:00 |
07:20:37.91 |
+20:21:07.7 |
HIP 35510 |
13.45 |
| 2026-08-09 12:00 |
07:21:10.80 |
+20:20:03.6 |
HIP 35699 |
12.64 |
| 2026-08-10 00:00 |
07:21:43.62 |
+20:18:59.2 |
HIP 35699 |
8.25 |
| 2026-08-10 12:00 |
07:22:16.37 |
+20:17:54.4 |
HIP 35699 |
9.84 |
| 2026-08-11 00:00 |
07:22:49.05 |
+20:16:49.3 |
HIP 35699 |
15.67 |
| 2026-08-11 12:00 |
07:23:21.66 |
+20:15:43.8 |
HIP 35801 |
18.09 |
| 2026-08-12 00:00 |
07:23:54.20 |
+20:14:38.0 |
HIP 35969 |
19.55 |
| 2026-08-12 12:00 |
07:24:26.67 |
+20:13:31.9 |
HIP 35969 |
14.52 |
| 2026-08-13 00:00 |
07:24:59.06 |
+20:12:25.5 |
HIP 35969 |
12.57 |
| 2026-08-13 12:00 |
07:25:31.38 |
+20:11:18.8 |
HIP 35969 |
14.92 |
| 2026-08-14 00:00 |
07:26:03.62 |
+20:10:11.7 |
HIP 36156 |
13.44 |
| 2026-08-14 12:00 |
07:26:35.79 |
+20:09:04.4 |
HIP 36156 |
8.00 |
| 2026-08-15 00:00 |
07:27:07.88 |
+20:07:56.7 |
HIP 36156 |
7.98 |
| 2026-08-15 12:00 |
07:27:39.90 |
+20:06:48.8 |
HIP 36156 |
13.39 |
| 2026-08-16 00:00 |
07:28:11.83 |
+20:05:40.5 |
HIP 36156 |
20.24 |
| 2026-08-16 12:00 |
07:28:43.69 |
+20:04:32.0 |
HIP 36319 |
25.43 |
| 2026-08-17 00:00 |
07:29:15.47 |
+20:03:23.2 |
HIP 36481 |
21.58 |
| 2026-08-17 12:00 |
07:29:47.17 |
+20:02:14.1 |
HIP 36481 |
15.86 |
| 2026-08-18 00:00 |
07:30:18.79 |
+20:01:04.8 |
HIP 36481 |
12.27 |
| 2026-08-18 12:00 |
07:30:50.32 |
+19:59:55.2 |
HIP 36607 |
12.46 |
| 2026-08-19 00:00 |
07:31:21.78 |
+19:58:45.3 |
HIP 36607 |
4.98 |