| Parameter |
Value |
| Designation |
C/2014 N3 (NEOWISE) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2015-03-13T04:47:40.300800Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:57Z |
| Obs used |
1594 |
| NEO |
- |
| M1 |
5.000 |
| K1 |
12.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2015-08-05.0000000 |
| e |
0.99933102 |
| q (au) |
3.882231 |
| a (au) |
5803.176986 |
| i (deg) |
61.638248 |
| Ω (om, deg) |
19.927065 |
| ω (w, deg) |
353.565396 |
| M (ma, deg) |
0.000323 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.073 + 2.710\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.073 |
| n |
2.710 |
| gf |
0.998 |
| gb |
-0.998 |
| 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) |
| 2026-09-20 00:00 |
12:42:51.63 |
+42:50:45.9 |
HIP 61947 |
16.65 |
| 2026-09-20 12:00 |
12:42:57.27 |
+42:50:09.6 |
HIP 61947 |
17.81 |
| 2026-09-21 00:00 |
12:43:02.91 |
+42:49:33.7 |
HIP 61947 |
18.97 |
| 2026-09-21 12:00 |
12:43:08.56 |
+42:48:58.2 |
HIP 61947 |
20.14 |
| 2026-09-22 00:00 |
12:43:14.22 |
+42:48:23.0 |
HIP 61947 |
21.30 |
| 2026-09-22 12:00 |
12:43:19.89 |
+42:47:48.3 |
HIP 61947 |
22.46 |
| 2026-09-23 00:00 |
12:43:25.56 |
+42:47:13.8 |
HIP 61947 |
23.63 |
| 2026-09-23 12:00 |
12:43:31.25 |
+42:46:39.8 |
HIP 62177 |
23.85 |
| 2026-09-24 00:00 |
12:43:36.94 |
+42:46:06.1 |
HIP 62272 |
22.95 |
| 2026-09-24 12:00 |
12:43:42.64 |
+42:45:32.8 |
HIP 62272 |
21.85 |
| 2026-09-25 00:00 |
12:43:48.34 |
+42:44:59.8 |
HIP 62272 |
20.75 |
| 2026-09-25 12:00 |
12:43:54.06 |
+42:44:27.3 |
HIP 62272 |
19.66 |
| 2026-09-26 00:00 |
12:43:59.77 |
+42:43:55.1 |
HIP 62272 |
18.59 |
| 2026-09-26 12:00 |
12:44:05.50 |
+42:43:23.3 |
HIP 62272 |
17.52 |
| 2026-09-27 00:00 |
12:44:11.23 |
+42:42:51.9 |
HIP 62272 |
16.47 |
| 2026-09-27 12:00 |
12:44:16.97 |
+42:42:20.9 |
HIP 62272 |
15.43 |
| 2026-09-28 00:00 |
12:44:22.71 |
+42:41:50.2 |
HIP 62272 |
14.41 |
| 2026-09-28 12:00 |
12:44:28.45 |
+42:41:19.9 |
HIP 62272 |
13.42 |
| 2026-09-29 00:00 |
12:44:34.20 |
+42:40:50.1 |
HIP 62272 |
12.45 |
| 2026-09-29 12:00 |
12:44:39.95 |
+42:40:20.6 |
HIP 62272 |
11.52 |
| 2026-09-30 00:00 |
12:44:45.71 |
+42:39:51.5 |
HIP 62272 |
10.64 |
| 2026-09-30 12:00 |
12:44:51.47 |
+42:39:22.8 |
HIP 62272 |
9.80 |
| 2026-10-01 00:00 |
12:44:57.24 |
+42:38:54.5 |
HIP 62272 |
9.04 |
| 2026-10-01 12:00 |
12:45:03.00 |
+42:38:26.5 |
HIP 62272 |
8.36 |
| 2026-10-02 00:00 |
12:45:08.77 |
+42:37:59.0 |
HIP 62272 |
7.80 |
| 2026-10-02 12:00 |
12:45:14.54 |
+42:37:31.9 |
HIP 62272 |
7.36 |
| 2026-10-03 00:00 |
12:45:20.31 |
+42:37:05.2 |
HIP 62272 |
7.08 |
| 2026-10-03 12:00 |
12:45:26.09 |
+42:36:38.9 |
HIP 62272 |
6.98 |
| 2026-10-04 00:00 |
12:45:31.86 |
+42:36:13.0 |
HIP 62272 |
7.06 |
| 2026-10-04 12:00 |
12:45:37.64 |
+42:35:47.4 |
HIP 62272 |
7.31 |
| 2026-10-05 00:00 |
12:45:43.42 |
+42:35:22.3 |
HIP 62272 |
7.72 |
| 2026-10-05 12:00 |
12:45:49.19 |
+42:34:57.7 |
HIP 62272 |
8.26 |
| 2026-10-06 00:00 |
12:45:54.97 |
+42:34:33.4 |
HIP 62272 |
8.91 |
| 2026-10-06 12:00 |
12:46:00.74 |
+42:34:09.5 |
HIP 62272 |
9.64 |
| 2026-10-07 00:00 |
12:46:06.52 |
+42:33:46.1 |
HIP 62272 |
10.44 |
| 2026-10-07 12:00 |
12:46:12.29 |
+42:33:23.0 |
HIP 62272 |
11.29 |
| 2026-10-08 00:00 |
12:46:18.06 |
+42:33:00.4 |
HIP 62272 |
12.17 |
| 2026-10-08 12:00 |
12:46:23.83 |
+42:32:38.2 |
HIP 62272 |
13.09 |
| 2026-10-09 00:00 |
12:46:29.59 |
+42:32:16.4 |
HIP 62272 |
14.04 |
| 2026-10-09 12:00 |
12:46:35.35 |
+42:31:55.1 |
HIP 62272 |
15.00 |
| 2026-10-10 00:00 |
12:46:41.11 |
+42:31:34.2 |
HIP 62272 |
15.98 |
| 2026-10-10 12:00 |
12:46:46.87 |
+42:31:13.7 |
HIP 62272 |
16.97 |
| 2026-10-11 00:00 |
12:46:52.62 |
+42:30:53.6 |
HIP 62272 |
17.96 |