C/2007 W3 (LINEAR)
| 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) |
| 2026-02-03 00:00 |
03:40:24.80 |
-70:31:43.9 |
HIP 16882 |
15.73 |
| 2026-02-03 12:00 |
03:40:22.70 |
-70:30:53.7 |
HIP 16882 |
15.64 |
| 2026-02-04 00:00 |
03:40:20.70 |
-70:30:03.4 |
HIP 16882 |
15.59 |
| 2026-02-04 12:00 |
03:40:18.77 |
-70:29:13.1 |
HIP 16882 |
15.60 |
| 2026-02-05 00:00 |
03:40:16.93 |
-70:28:22.6 |
HIP 16882 |
15.67 |
| 2026-02-05 12:00 |
03:40:15.17 |
-70:27:32.1 |
HIP 16882 |
15.78 |
| 2026-02-06 00:00 |
03:40:13.50 |
-70:26:41.5 |
HIP 16882 |
15.95 |
| 2026-02-06 12:00 |
03:40:11.91 |
-70:25:50.8 |
HIP 16882 |
16.17 |
| 2026-02-07 00:00 |
03:40:10.40 |
-70:25:00.0 |
HIP 16882 |
16.43 |
| 2026-02-07 12:00 |
03:40:08.98 |
-70:24:09.2 |
HIP 16882 |
16.75 |
| 2026-02-08 00:00 |
03:40:07.64 |
-70:23:18.3 |
HIP 16882 |
17.10 |
| 2026-02-08 12:00 |
03:40:06.38 |
-70:22:27.3 |
HIP 16882 |
17.50 |
| 2026-02-09 00:00 |
03:40:05.21 |
-70:21:36.3 |
HIP 16882 |
17.93 |
| 2026-02-09 12:00 |
03:40:04.12 |
-70:20:45.3 |
HIP 16882 |
18.40 |
| 2026-02-10 00:00 |
03:40:03.12 |
-70:19:54.2 |
HIP 16882 |
18.91 |
| 2026-02-10 12:00 |
03:40:02.20 |
-70:19:03.0 |
HIP 16882 |
19.44 |
| 2026-02-11 00:00 |
03:40:01.36 |
-70:18:11.8 |
HIP 16882 |
20.00 |
| 2026-02-11 12:00 |
03:40:00.61 |
-70:17:20.6 |
HIP 16882 |
20.59 |
| 2026-02-12 00:00 |
03:39:59.94 |
-70:16:29.4 |
HIP 16882 |
21.20 |
| 2026-02-12 12:00 |
03:39:59.35 |
-70:15:38.1 |
HIP 16882 |
21.83 |
| 2026-02-13 00:00 |
03:39:58.84 |
-70:14:46.8 |
HIP 16882 |
22.48 |
| 2026-02-13 12:00 |
03:39:58.42 |
-70:13:55.4 |
HIP 16882 |
23.14 |
| 2026-02-14 00:00 |
03:39:58.08 |
-70:13:04.1 |
HIP 16882 |
23.83 |
| 2026-02-14 12:00 |
03:39:57.82 |
-70:12:12.7 |
HIP 16882 |
24.53 |
| 2026-02-15 00:00 |
03:39:57.65 |
-70:11:21.3 |
HIP 16882 |
25.24 |
| 2026-02-15 12:00 |
03:39:57.55 |
-70:10:30.0 |
HIP 16882 |
25.96 |
| 2026-02-16 00:00 |
03:39:57.54 |
-70:09:38.6 |
HIP 17486 |
25.91 |
| 2026-02-16 12:00 |
03:39:57.61 |
-70:08:47.2 |
HIP 17486 |
25.66 |
| 2026-02-17 00:00 |
03:39:57.77 |
-70:07:55.8 |
HIP 17486 |
25.43 |
| 2026-02-17 12:00 |
03:39:58.00 |
-70:07:04.5 |
HIP 17486 |
25.22 |
| 2026-02-18 00:00 |
03:39:58.32 |
-70:06:13.1 |
HIP 17486 |
25.03 |
| 2026-02-18 12:00 |
03:39:58.71 |
-70:05:21.8 |
HIP 17486 |
24.86 |
| 2026-02-19 00:00 |
03:39:59.19 |
-70:04:30.5 |
HIP 17486 |
24.71 |
| 2026-02-19 12:00 |
03:39:59.75 |
-70:03:39.2 |
HIP 17486 |
24.59 |
| 2026-02-20 00:00 |
03:40:00.39 |
-70:02:48.0 |
HIP 17486 |
24.48 |
| 2026-02-20 12:00 |
03:40:01.11 |
-70:01:56.7 |
HIP 17486 |
24.40 |
| 2026-02-21 00:00 |
03:40:01.91 |
-70:01:05.5 |
HIP 17486 |
24.34 |
| 2026-02-21 12:00 |
03:40:02.78 |
-70:00:14.4 |
HIP 17486 |
24.31 |
| 2026-02-22 00:00 |
03:40:03.74 |
-69:59:23.3 |
HIP 17486 |
24.30 |
| 2026-02-22 12:00 |
03:40:04.78 |
-69:58:32.3 |
HIP 17486 |
24.31 |
| 2026-02-23 00:00 |
03:40:05.89 |
-69:57:41.3 |
HIP 17486 |
24.34 |
| 2026-02-23 12:00 |
03:40:07.09 |
-69:56:50.3 |
HIP 17486 |
24.40 |
| 2026-02-24 00:00 |
03:40:08.36 |
-69:55:59.4 |
HIP 17486 |
24.48 |