C/2016 B1 (NEOWISE)
| Parameter |
Value |
| Designation |
C/2016 B1 (NEOWISE) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2016-12-04T17:12:22.285440Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:22Z |
| Obs used |
522 |
| NEO |
- |
| M1 |
10.500 |
| K1 |
8.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2017-03-28.0000000 |
| e |
0.99239477 |
| q (au) |
3.206199 |
| a (au) |
421.578150 |
| i (deg) |
50.476159 |
| Ω (om, deg) |
231.954169 |
| ω (w, deg) |
8.559465 |
| M (ma, deg) |
0.012899 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.995 + 3.769\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.995 |
| n |
3.769 |
| gf |
1.000 |
| gb |
-0.508 |
| 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 |
00:44:29.67 |
+33:56:46.1 |
HIP 3418 |
13.22 |
| 2026-02-03 12:00 |
00:44:33.62 |
+33:56:24.4 |
HIP 3418 |
13.80 |
| 2026-02-04 00:00 |
00:44:37.60 |
+33:56:03.1 |
HIP 3418 |
14.43 |
| 2026-02-04 12:00 |
00:44:41.63 |
+33:55:42.2 |
HIP 3528 |
14.53 |
| 2026-02-05 00:00 |
00:44:45.70 |
+33:55:21.7 |
HIP 3528 |
14.00 |
| 2026-02-05 12:00 |
00:44:49.80 |
+33:55:01.6 |
HIP 3528 |
13.51 |
| 2026-02-06 00:00 |
00:44:53.95 |
+33:54:41.9 |
HIP 3528 |
13.08 |
| 2026-02-06 12:00 |
00:44:58.13 |
+33:54:22.6 |
HIP 3528 |
12.71 |
| 2026-02-07 00:00 |
00:45:02.35 |
+33:54:03.7 |
HIP 3528 |
12.40 |
| 2026-02-07 12:00 |
00:45:06.61 |
+33:53:45.2 |
HIP 3528 |
12.16 |
| 2026-02-08 00:00 |
00:45:10.91 |
+33:53:27.1 |
HIP 3528 |
12.00 |
| 2026-02-08 12:00 |
00:45:15.25 |
+33:53:09.4 |
HIP 3528 |
11.92 |
| 2026-02-09 00:00 |
00:45:19.63 |
+33:52:52.2 |
HIP 3528 |
11.93 |
| 2026-02-09 12:00 |
00:45:24.04 |
+33:52:35.3 |
HIP 3528 |
12.02 |
| 2026-02-10 00:00 |
00:45:28.49 |
+33:52:18.8 |
HIP 3528 |
12.20 |
| 2026-02-10 12:00 |
00:45:32.98 |
+33:52:02.8 |
HIP 3528 |
12.45 |
| 2026-02-11 00:00 |
00:45:37.50 |
+33:51:47.1 |
HIP 3528 |
12.79 |
| 2026-02-11 12:00 |
00:45:42.06 |
+33:51:31.9 |
HIP 3528 |
13.20 |
| 2026-02-12 00:00 |
00:45:46.66 |
+33:51:17.1 |
HIP 3528 |
13.68 |
| 2026-02-12 12:00 |
00:45:51.29 |
+33:51:02.7 |
HIP 3528 |
14.22 |
| 2026-02-13 00:00 |
00:45:55.96 |
+33:50:48.6 |
HIP 3528 |
14.82 |
| 2026-02-13 12:00 |
00:46:00.66 |
+33:50:35.0 |
HIP 3528 |
15.47 |
| 2026-02-14 00:00 |
00:46:05.40 |
+33:50:21.8 |
HIP 3528 |
16.17 |
| 2026-02-14 12:00 |
00:46:10.17 |
+33:50:09.1 |
HIP 3528 |
16.90 |
| 2026-02-15 00:00 |
00:46:14.98 |
+33:49:56.7 |
HIP 3528 |
17.68 |
| 2026-02-15 12:00 |
00:46:19.82 |
+33:49:44.7 |
HIP 3528 |
18.48 |
| 2026-02-16 00:00 |
00:46:24.69 |
+33:49:33.1 |
HIP 3528 |
19.32 |
| 2026-02-16 12:00 |
00:46:29.59 |
+33:49:22.0 |
HIP 3528 |
20.19 |
| 2026-02-17 00:00 |
00:46:34.53 |
+33:49:11.2 |
HIP 3528 |
21.07 |
| 2026-02-17 12:00 |
00:46:39.51 |
+33:49:00.9 |
HIP 3528 |
21.98 |
| 2026-02-18 00:00 |
00:46:44.51 |
+33:48:51.0 |
HIP 3528 |
22.92 |
| 2026-02-18 12:00 |
00:46:49.54 |
+33:48:41.4 |
HIP 3528 |
23.86 |
| 2026-02-19 00:00 |
00:46:54.61 |
+33:48:32.3 |
HIP 3528 |
24.83 |
| 2026-02-19 12:00 |
00:46:59.71 |
+33:48:23.6 |
HIP 3528 |
25.81 |
| 2026-02-20 00:00 |
00:47:04.84 |
+33:48:15.3 |
HIP 3528 |
26.81 |
| 2026-02-20 12:00 |
00:47:10.00 |
+33:48:07.4 |
HIP 3528 |
27.82 |
| 2026-02-21 00:00 |
00:47:15.18 |
+33:48:00.0 |
HIP 3528 |
28.84 |
| 2026-02-21 12:00 |
00:47:20.40 |
+33:47:52.8 |
HIP 3528 |
29.88 |
| 2026-02-22 00:00 |
00:47:25.65 |
+33:47:46.1 |
HIP 3528 |
30.92 |
| 2026-02-22 12:00 |
00:47:30.93 |
+33:47:39.9 |
HIP 3528 |
31.98 |
| 2026-02-23 00:00 |
00:47:36.23 |
+33:47:34.0 |
HIP 3528 |
33.05 |
| 2026-02-23 12:00 |
00:47:41.56 |
+33:47:28.5 |
HIP 3528 |
34.12 |
| 2026-02-24 00:00 |
00:47:46.92 |
+33:47:23.4 |
HIP 3528 |
35.21 |