| Parameter |
Value |
| Designation |
204P/LINEAR-NEAT |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-12-11T12:45:33.013440Z |
| Orbit solution date (soln_date, UTC) |
2024-05-07T15:48:38Z |
| Obs used |
1273 |
| NEO |
- |
| M1 |
15.300 |
| K1 |
7.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2014-11-28.0000000 |
| e |
0.47217310 |
| q (au) |
1.929928 |
| a (au) |
3.656366 |
| i (deg) |
6.588859 |
| Ω (om, deg) |
109.072895 |
| ω (w, deg) |
355.047711 |
| M (ma, deg) |
306.638046 |
Magnitude
Scatter + Global Linear
$$
M_a = (13.380 + 4.629\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.380 |
| n |
4.629 |
| gf |
1.000 |
| gb |
-0.796 |
| k |
0.998 |
| 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) |
| 2026-06-01 00:00 |
19:52:12.29 |
-20:54:08.5 |
HIP 97836 |
13.62 |
| 2026-06-01 12:00 |
19:52:02.25 |
-20:54:49.2 |
HIP 97836 |
14.90 |
| 2026-06-02 00:00 |
19:51:52.02 |
-20:55:30.4 |
HIP 97836 |
16.48 |
| 2026-06-02 12:00 |
19:51:41.60 |
-20:56:12.1 |
HIP 97836 |
18.30 |
| 2026-06-03 00:00 |
19:51:31.00 |
-20:56:54.2 |
HIP 97836 |
20.31 |
| 2026-06-03 12:00 |
19:51:20.21 |
-20:57:36.9 |
HIP 97836 |
22.48 |
| 2026-06-04 00:00 |
19:51:09.24 |
-20:58:20.0 |
HIP 97559 |
23.95 |
| 2026-06-04 12:00 |
19:50:58.08 |
-20:59:03.6 |
HIP 97559 |
22.31 |
| 2026-06-05 00:00 |
19:50:46.75 |
-20:59:47.7 |
HIP 97559 |
20.87 |
| 2026-06-05 12:00 |
19:50:35.23 |
-21:00:32.2 |
HIP 97559 |
19.70 |
| 2026-06-06 00:00 |
19:50:23.52 |
-21:01:17.2 |
HIP 97559 |
18.85 |
| 2026-06-06 12:00 |
19:50:11.64 |
-21:02:02.6 |
HIP 97559 |
18.40 |
| 2026-06-07 00:00 |
19:49:59.59 |
-21:02:48.5 |
HIP 97559 |
18.39 |
| 2026-06-07 12:00 |
19:49:47.35 |
-21:03:34.8 |
HIP 97559 |
18.84 |
| 2026-06-08 00:00 |
19:49:34.94 |
-21:04:21.6 |
HIP 97559 |
19.75 |
| 2026-06-08 12:00 |
19:49:22.35 |
-21:05:08.7 |
HIP 97427 |
18.33 |
| 2026-06-09 00:00 |
19:49:09.58 |
-21:05:56.3 |
HIP 97427 |
15.27 |
| 2026-06-09 12:00 |
19:48:56.65 |
-21:06:44.3 |
HIP 97427 |
12.18 |
| 2026-06-10 00:00 |
19:48:43.54 |
-21:07:32.7 |
HIP 97427 |
9.08 |
| 2026-06-10 12:00 |
19:48:30.27 |
-21:08:21.5 |
HIP 97427 |
6.00 |
| 2026-06-11 00:00 |
19:48:16.82 |
-21:09:10.7 |
HIP 97427 |
3.13 |
| 2026-06-11 12:00 |
19:48:03.21 |
-21:10:00.3 |
HIP 97427 |
2.17 |
| 2026-06-12 00:00 |
19:47:49.43 |
-21:10:50.3 |
HIP 97427 |
4.63 |
| 2026-06-12 12:00 |
19:47:35.49 |
-21:11:40.7 |
HIP 97427 |
7.79 |
| 2026-06-13 00:00 |
19:47:21.39 |
-21:12:31.4 |
HIP 97427 |
11.11 |
| 2026-06-13 12:00 |
19:47:07.12 |
-21:13:22.4 |
HIP 97427 |
14.50 |
| 2026-06-14 00:00 |
19:46:52.70 |
-21:14:13.9 |
HIP 97301 |
17.92 |
| 2026-06-14 12:00 |
19:46:38.12 |
-21:15:05.6 |
HIP 97301 |
16.39 |
| 2026-06-15 00:00 |
19:46:23.38 |
-21:15:57.7 |
HIP 97301 |
15.50 |
| 2026-06-15 12:00 |
19:46:08.49 |
-21:16:50.1 |
HIP 97301 |
15.41 |
| 2026-06-16 00:00 |
19:45:53.45 |
-21:17:42.9 |
HIP 97301 |
16.14 |
| 2026-06-16 12:00 |
19:45:38.26 |
-21:18:35.9 |
HIP 97301 |
17.62 |
| 2026-06-17 00:00 |
19:45:22.92 |
-21:19:29.3 |
HIP 97301 |
19.70 |
| 2026-06-17 12:00 |
19:45:07.44 |
-21:20:22.9 |
HIP 97301 |
22.22 |
| 2026-06-18 00:00 |
19:44:51.81 |
-21:21:16.9 |
HIP 97301 |
25.06 |
| 2026-06-18 12:00 |
19:44:36.05 |
-21:22:11.1 |
HIP 97004 |
23.74 |
| 2026-06-19 00:00 |
19:44:20.14 |
-21:23:05.5 |
HIP 97004 |
19.94 |
| 2026-06-19 12:00 |
19:44:04.10 |
-21:24:00.2 |
HIP 97004 |
16.10 |
| 2026-06-20 00:00 |
19:43:47.93 |
-21:24:55.2 |
HIP 97004 |
12.24 |
| 2026-06-20 12:00 |
19:43:31.62 |
-21:25:50.4 |
HIP 97004 |
8.37 |
| 2026-06-21 00:00 |
19:43:15.18 |
-21:26:45.9 |
HIP 97004 |
4.51 |
| 2026-06-21 12:00 |
19:42:58.62 |
-21:27:41.5 |
HIP 97004 |
1.29 |
| 2026-06-22 00:00 |
19:42:41.93 |
-21:28:37.4 |
HIP 97004 |
3.82 |