C/1998 W3 (LINEAR)
| Parameter |
Value |
| Designation |
C/1998 W3 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1998-10-06T17:14:54.798720Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:57Z |
| Obs used |
162 |
| NEO |
- |
| M1 |
6.500 |
| K1 |
10.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1999-02-19.0000000 |
| e |
1.00089959 |
| q (au) |
4.914592 |
| a (au) |
-5463.131541 |
| i (deg) |
129.186877 |
| Ω (om, deg) |
123.916981 |
| ω (w, deg) |
6.886773 |
| M (ma, deg) |
0.000330 |
Magnitude
Scatter + Global Linear
$$
M_a = (2.412 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
2.412 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
21:16:47.25 |
+08:21:21.3 |
HIP 105104 |
11.91 |
| 2026-02-03 12:00 |
21:16:49.61 |
+08:21:28.6 |
HIP 105104 |
11.53 |
| 2026-02-04 00:00 |
21:16:51.97 |
+08:21:36.0 |
HIP 105104 |
11.18 |
| 2026-02-04 12:00 |
21:16:54.34 |
+08:21:43.6 |
HIP 105104 |
10.84 |
| 2026-02-05 00:00 |
21:16:56.70 |
+08:21:51.3 |
HIP 105104 |
10.53 |
| 2026-02-05 12:00 |
21:16:59.06 |
+08:21:59.1 |
HIP 105104 |
10.25 |
| 2026-02-06 00:00 |
21:17:01.42 |
+08:22:07.1 |
HIP 105104 |
10.00 |
| 2026-02-06 12:00 |
21:17:03.79 |
+08:22:15.2 |
HIP 105104 |
9.78 |
| 2026-02-07 00:00 |
21:17:06.15 |
+08:22:23.5 |
HIP 105104 |
9.59 |
| 2026-02-07 12:00 |
21:17:08.51 |
+08:22:31.9 |
HIP 105104 |
9.44 |
| 2026-02-08 00:00 |
21:17:10.87 |
+08:22:40.4 |
HIP 105104 |
9.33 |
| 2026-02-08 12:00 |
21:17:13.23 |
+08:22:49.0 |
HIP 105104 |
9.26 |
| 2026-02-09 00:00 |
21:17:15.59 |
+08:22:57.8 |
HIP 105104 |
9.23 |
| 2026-02-09 12:00 |
21:17:17.95 |
+08:23:06.7 |
HIP 105104 |
9.25 |
| 2026-02-10 00:00 |
21:17:20.30 |
+08:23:15.7 |
HIP 105104 |
9.30 |
| 2026-02-10 12:00 |
21:17:22.66 |
+08:23:24.8 |
HIP 105104 |
9.39 |
| 2026-02-11 00:00 |
21:17:25.01 |
+08:23:34.1 |
HIP 105104 |
9.52 |
| 2026-02-11 12:00 |
21:17:27.36 |
+08:23:43.5 |
HIP 105104 |
9.69 |
| 2026-02-12 00:00 |
21:17:29.71 |
+08:23:53.0 |
HIP 105104 |
9.90 |
| 2026-02-12 12:00 |
21:17:32.06 |
+08:24:02.7 |
HIP 105104 |
10.14 |
| 2026-02-13 00:00 |
21:17:34.40 |
+08:24:12.5 |
HIP 105104 |
10.41 |
| 2026-02-13 12:00 |
21:17:36.74 |
+08:24:22.4 |
HIP 105104 |
10.71 |
| 2026-02-14 00:00 |
21:17:39.08 |
+08:24:32.4 |
HIP 105104 |
11.04 |
| 2026-02-14 12:00 |
21:17:41.42 |
+08:24:42.5 |
HIP 105104 |
11.39 |
| 2026-02-15 00:00 |
21:17:43.75 |
+08:24:52.8 |
HIP 105104 |
11.76 |
| 2026-02-15 12:00 |
21:17:46.08 |
+08:25:03.1 |
HIP 105104 |
12.15 |
| 2026-02-16 00:00 |
21:17:48.40 |
+08:25:13.6 |
HIP 105104 |
12.56 |
| 2026-02-16 12:00 |
21:17:50.73 |
+08:25:24.2 |
HIP 105104 |
12.99 |
| 2026-02-17 00:00 |
21:17:53.04 |
+08:25:35.0 |
HIP 105104 |
13.43 |
| 2026-02-17 12:00 |
21:17:55.36 |
+08:25:45.8 |
HIP 105104 |
13.88 |
| 2026-02-18 00:00 |
21:17:57.67 |
+08:25:56.7 |
HIP 105104 |
14.35 |
| 2026-02-18 12:00 |
21:17:59.97 |
+08:26:07.8 |
HIP 105104 |
14.82 |
| 2026-02-19 00:00 |
21:18:02.27 |
+08:26:19.0 |
HIP 105104 |
15.31 |
| 2026-02-19 12:00 |
21:18:04.57 |
+08:26:30.3 |
HIP 105104 |
15.80 |
| 2026-02-20 00:00 |
21:18:06.86 |
+08:26:41.7 |
HIP 105104 |
16.30 |
| 2026-02-20 12:00 |
21:18:09.14 |
+08:26:53.2 |
HIP 105104 |
16.81 |
| 2026-02-21 00:00 |
21:18:11.42 |
+08:27:04.8 |
HIP 105104 |
17.33 |
| 2026-02-21 12:00 |
21:18:13.70 |
+08:27:16.5 |
HIP 105104 |
17.85 |
| 2026-02-22 00:00 |
21:18:15.97 |
+08:27:28.3 |
HIP 105104 |
18.37 |
| 2026-02-22 12:00 |
21:18:18.23 |
+08:27:40.2 |
HIP 105104 |
18.90 |
| 2026-02-23 00:00 |
21:18:20.49 |
+08:27:52.2 |
HIP 105104 |
19.43 |
| 2026-02-23 12:00 |
21:18:22.74 |
+08:28:04.3 |
HIP 105104 |
19.97 |
| 2026-02-24 00:00 |
21:18:24.98 |
+08:28:16.6 |
HIP 105104 |
20.51 |