| Parameter |
Value |
| Designation |
C/2007 W3 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2008-06-02T19:04:58.730880Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:15Z |
| Obs used |
206 |
| NEO |
- |
| M1 |
15.300 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2008-02-28.0000000 |
| e |
1.00016327 |
| q (au) |
1.776638 |
| a (au) |
-10881.860403 |
| i (deg) |
78.673550 |
| Ω (om, deg) |
73.069451 |
| ω (w, deg) |
112.625589 |
| M (ma, deg) |
-0.000083 |
Magnitude
Scatter + Global Linear
$$
M_a = (16.097 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.097 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.577 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
04:14:51.64 |
-70:25:02.8 |
HIP 19704 |
8.10 |
| 2026-09-20 12:00 |
04:14:48.12 |
-70:25:44.3 |
HIP 19704 |
7.82 |
| 2026-09-21 00:00 |
04:14:44.52 |
-70:26:25.5 |
HIP 19704 |
7.59 |
| 2026-09-21 12:00 |
04:14:40.85 |
-70:27:06.6 |
HIP 19704 |
7.43 |
| 2026-09-22 00:00 |
04:14:37.10 |
-70:27:47.6 |
HIP 19704 |
7.34 |
| 2026-09-22 12:00 |
04:14:33.27 |
-70:28:28.3 |
HIP 19704 |
7.31 |
| 2026-09-23 00:00 |
04:14:29.36 |
-70:29:08.9 |
HIP 19704 |
7.35 |
| 2026-09-23 12:00 |
04:14:25.38 |
-70:29:49.3 |
HIP 19704 |
7.46 |
| 2026-09-24 00:00 |
04:14:21.33 |
-70:30:29.5 |
HIP 19704 |
7.64 |
| 2026-09-24 12:00 |
04:14:17.19 |
-70:31:09.5 |
HIP 19704 |
7.88 |
| 2026-09-25 00:00 |
04:14:12.98 |
-70:31:49.3 |
HIP 19704 |
8.18 |
| 2026-09-25 12:00 |
04:14:08.70 |
-70:32:29.0 |
HIP 19704 |
8.53 |
| 2026-09-26 00:00 |
04:14:04.33 |
-70:33:08.4 |
HIP 19704 |
8.92 |
| 2026-09-26 12:00 |
04:13:59.90 |
-70:33:47.7 |
HIP 19704 |
9.35 |
| 2026-09-27 00:00 |
04:13:55.39 |
-70:34:26.7 |
HIP 19704 |
9.81 |
| 2026-09-27 12:00 |
04:13:50.80 |
-70:35:05.5 |
HIP 19704 |
10.30 |
| 2026-09-28 00:00 |
04:13:46.14 |
-70:35:44.2 |
HIP 19791 |
10.55 |
| 2026-09-28 12:00 |
04:13:41.40 |
-70:36:22.6 |
HIP 19791 |
10.11 |
| 2026-09-29 00:00 |
04:13:36.59 |
-70:37:00.8 |
HIP 19791 |
9.71 |
| 2026-09-29 12:00 |
04:13:31.71 |
-70:37:38.7 |
HIP 19791 |
9.36 |
| 2026-09-30 00:00 |
04:13:26.75 |
-70:38:16.5 |
HIP 19791 |
9.06 |
| 2026-09-30 12:00 |
04:13:21.72 |
-70:38:54.0 |
HIP 19791 |
8.83 |
| 2026-10-01 00:00 |
04:13:16.62 |
-70:39:31.3 |
HIP 19791 |
8.66 |
| 2026-10-01 12:00 |
04:13:11.44 |
-70:40:08.4 |
HIP 19791 |
8.56 |
| 2026-10-02 00:00 |
04:13:06.19 |
-70:40:45.2 |
HIP 19791 |
8.53 |
| 2026-10-02 12:00 |
04:13:00.87 |
-70:41:21.8 |
HIP 19791 |
8.58 |
| 2026-10-03 00:00 |
04:12:55.48 |
-70:41:58.1 |
HIP 19791 |
8.70 |
| 2026-10-03 12:00 |
04:12:50.01 |
-70:42:34.2 |
HIP 19791 |
8.88 |
| 2026-10-04 00:00 |
04:12:44.47 |
-70:43:10.1 |
HIP 19791 |
9.13 |
| 2026-10-04 12:00 |
04:12:38.86 |
-70:43:45.7 |
HIP 19791 |
9.44 |
| 2026-10-05 00:00 |
04:12:33.18 |
-70:44:21.0 |
HIP 19791 |
9.81 |
| 2026-10-05 12:00 |
04:12:27.43 |
-70:44:56.1 |
HIP 19791 |
10.22 |
| 2026-10-06 00:00 |
04:12:21.61 |
-70:45:30.9 |
HIP 19791 |
10.68 |
| 2026-10-06 12:00 |
04:12:15.72 |
-70:46:05.5 |
HIP 19791 |
11.17 |
| 2026-10-07 00:00 |
04:12:09.76 |
-70:46:39.7 |
HIP 19791 |
11.70 |
| 2026-10-07 12:00 |
04:12:03.73 |
-70:47:13.7 |
HIP 19791 |
12.25 |
| 2026-10-08 00:00 |
04:11:57.63 |
-70:47:47.5 |
HIP 19791 |
12.83 |
| 2026-10-08 12:00 |
04:11:51.46 |
-70:48:20.9 |
HIP 19791 |
13.43 |
| 2026-10-09 00:00 |
04:11:45.23 |
-70:48:54.1 |
HIP 19791 |
14.05 |
| 2026-10-09 12:00 |
04:11:38.93 |
-70:49:26.9 |
HIP 19791 |
14.68 |
| 2026-10-10 00:00 |
04:11:32.56 |
-70:49:59.5 |
HIP 19791 |
15.33 |
| 2026-10-10 12:00 |
04:11:26.12 |
-70:50:31.8 |
HIP 19791 |
15.99 |
| 2026-10-11 00:00 |
04:11:19.62 |
-70:51:03.8 |
HIP 19791 |
16.67 |