C/2017 B3 (LINEAR)
| Parameter |
Value |
| Designation |
C/2017 B3 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-02-02T14:22:55.968960Z |
| Orbit solution date (soln_date, UTC) |
2022-07-31T01:42:28Z |
| Obs used |
1591 |
| NEO |
- |
| M1 |
6.300 |
| K1 |
9.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2019-11-01.0000000 |
| e |
1.00205503 |
| q (au) |
3.921429 |
| a (au) |
-1908.207887 |
| i (deg) |
54.177778 |
| Ω (om, deg) |
2.178286 |
| ω (w, deg) |
284.767790 |
| M (ma, deg) |
0.003209 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.267 + 4.444\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.267 |
| n |
4.444 |
| gf |
1.000 |
| gb |
-0.790 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2016-03-04 |
2017-03-10 |
+20.0904 |
-16.483 |
| 2017-03-10 |
2019-02-01 |
+0.1708 |
+0.419 |
| 2019-03-27 |
2019-11-19 |
-14.3328 |
+9.294 |
| 2019-11-19 |
2020-11-13 |
+1.1970 |
-1.243 |
| 2020-11-13 |
2022-01-01 |
+11.4957 |
-9.995 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
00:47:48.51 |
+45:46:26.4 |
HIP 3844 |
15.73 |
| 2026-02-03 12:00 |
00:47:53.62 |
+45:46:01.0 |
HIP 3844 |
14.90 |
| 2026-02-04 00:00 |
00:47:58.79 |
+45:45:36.1 |
HIP 3844 |
14.08 |
| 2026-02-04 12:00 |
00:48:04.01 |
+45:45:11.8 |
HIP 3844 |
13.27 |
| 2026-02-05 00:00 |
00:48:09.30 |
+45:44:48.0 |
HIP 3844 |
12.47 |
| 2026-02-05 12:00 |
00:48:14.65 |
+45:44:24.7 |
HIP 3844 |
11.69 |
| 2026-02-06 00:00 |
00:48:20.05 |
+45:44:02.0 |
HIP 3844 |
10.94 |
| 2026-02-06 12:00 |
00:48:25.52 |
+45:43:39.8 |
HIP 3844 |
10.22 |
| 2026-02-07 00:00 |
00:48:31.04 |
+45:43:18.2 |
HIP 3844 |
9.54 |
| 2026-02-07 12:00 |
00:48:36.61 |
+45:42:57.1 |
HIP 3844 |
8.91 |
| 2026-02-08 00:00 |
00:48:42.25 |
+45:42:36.6 |
HIP 3844 |
8.35 |
| 2026-02-08 12:00 |
00:48:47.94 |
+45:42:16.6 |
HIP 3844 |
7.88 |
| 2026-02-09 00:00 |
00:48:53.68 |
+45:41:57.1 |
HIP 3844 |
7.51 |
| 2026-02-09 12:00 |
00:48:59.49 |
+45:41:38.2 |
HIP 3844 |
7.26 |
| 2026-02-10 00:00 |
00:49:05.34 |
+45:41:19.9 |
HIP 3844 |
7.15 |
| 2026-02-10 12:00 |
00:49:11.26 |
+45:41:02.1 |
HIP 3844 |
7.19 |
| 2026-02-11 00:00 |
00:49:17.22 |
+45:40:44.9 |
HIP 3844 |
7.38 |
| 2026-02-11 12:00 |
00:49:23.24 |
+45:40:28.2 |
HIP 3844 |
7.70 |
| 2026-02-12 00:00 |
00:49:29.32 |
+45:40:12.1 |
HIP 3844 |
8.16 |
| 2026-02-12 12:00 |
00:49:35.44 |
+45:39:56.5 |
HIP 3844 |
8.72 |
| 2026-02-13 00:00 |
00:49:41.62 |
+45:39:41.6 |
HIP 3844 |
9.37 |
| 2026-02-13 12:00 |
00:49:47.85 |
+45:39:27.1 |
HIP 3844 |
10.10 |
| 2026-02-14 00:00 |
00:49:54.13 |
+45:39:13.3 |
HIP 3844 |
10.89 |
| 2026-02-14 12:00 |
00:50:00.47 |
+45:39:00.0 |
HIP 3844 |
11.73 |
| 2026-02-15 00:00 |
00:50:06.85 |
+45:38:47.2 |
HIP 3844 |
12.62 |
| 2026-02-15 12:00 |
00:50:13.28 |
+45:38:35.0 |
HIP 3844 |
13.54 |
| 2026-02-16 00:00 |
00:50:19.77 |
+45:38:23.4 |
HIP 3844 |
14.50 |
| 2026-02-16 12:00 |
00:50:26.30 |
+45:38:12.4 |
HIP 3844 |
15.48 |
| 2026-02-17 00:00 |
00:50:32.88 |
+45:38:01.9 |
HIP 3844 |
16.48 |
| 2026-02-17 12:00 |
00:50:39.51 |
+45:37:52.0 |
HIP 3844 |
17.51 |
| 2026-02-18 00:00 |
00:50:46.19 |
+45:37:42.7 |
HIP 3844 |
18.55 |
| 2026-02-18 12:00 |
00:50:52.91 |
+45:37:33.9 |
HIP 3844 |
19.62 |
| 2026-02-19 00:00 |
00:50:59.68 |
+45:37:25.7 |
HIP 3844 |
20.69 |
| 2026-02-19 12:00 |
00:51:06.50 |
+45:37:18.1 |
HIP 4115 |
20.41 |
| 2026-02-20 00:00 |
00:51:13.36 |
+45:37:11.0 |
HIP 4115 |
19.34 |
| 2026-02-20 12:00 |
00:51:20.27 |
+45:37:04.5 |
HIP 4115 |
18.28 |
| 2026-02-21 00:00 |
00:51:27.22 |
+45:36:58.6 |
HIP 4115 |
17.24 |
| 2026-02-21 12:00 |
00:51:34.22 |
+45:36:53.3 |
HIP 4115 |
16.23 |
| 2026-02-22 00:00 |
00:51:41.26 |
+45:36:48.5 |
HIP 4115 |
15.25 |
| 2026-02-22 12:00 |
00:51:48.34 |
+45:36:44.3 |
HIP 4115 |
14.31 |
| 2026-02-23 00:00 |
00:51:55.47 |
+45:36:40.7 |
HIP 4115 |
13.42 |
| 2026-02-23 12:00 |
00:52:02.63 |
+45:36:37.6 |
HIP 4115 |
12.60 |
| 2026-02-24 00:00 |
00:52:09.84 |
+45:36:35.1 |
HIP 4115 |
11.86 |