| Parameter |
Value |
| Designation |
C/2016 A8 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2016-08-30T16:04:12.187200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:22Z |
| Obs used |
1422 |
| NEO |
- |
| M1 |
10.400 |
| K1 |
13.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2016-08-11.0000000 |
| e |
0.94634519 |
| q (au) |
1.881129 |
| a (au) |
35.059838 |
| i (deg) |
148.211836 |
| Ω (om, deg) |
111.232164 |
| ω (w, deg) |
130.265301 |
| M (ma, deg) |
359.906613 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.519 + 5.854\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.519 |
| n |
5.854 |
| gf |
0.999 |
| gb |
-1.000 |
| k |
0.998 |
| 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 |
| 2014-08-24 |
2016-01-17 |
-32.6027 |
+16.540 |
| 2016-01-17 |
2016-08-30 |
+0.8040 |
-0.427 |
| 2016-08-30 |
2017-03-05 |
-3.2783 |
+0.896 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
11:22:39.59 |
-29:11:21.2 |
HIP 55576 |
18.40 |
| 2026-07-29 12:00 |
11:22:43.14 |
-29:11:06.8 |
HIP 55576 |
17.95 |
| 2026-07-30 00:00 |
11:22:46.72 |
-29:10:52.8 |
HIP 55576 |
17.53 |
| 2026-07-30 12:00 |
11:22:50.33 |
-29:10:39.3 |
HIP 55576 |
17.15 |
| 2026-07-31 00:00 |
11:22:53.97 |
-29:10:26.2 |
HIP 55576 |
16.80 |
| 2026-07-31 12:00 |
11:22:57.63 |
-29:10:13.5 |
HIP 55576 |
16.49 |
| 2026-08-01 00:00 |
11:23:01.32 |
-29:10:01.1 |
HIP 55576 |
16.22 |
| 2026-08-01 12:00 |
11:23:05.04 |
-29:09:49.2 |
HIP 55576 |
16.00 |
| 2026-08-02 00:00 |
11:23:08.79 |
-29:09:37.8 |
HIP 55576 |
15.83 |
| 2026-08-02 12:00 |
11:23:12.57 |
-29:09:26.7 |
HIP 55576 |
15.71 |
| 2026-08-03 00:00 |
11:23:16.37 |
-29:09:16.0 |
HIP 55576 |
15.64 |
| 2026-08-03 12:00 |
11:23:20.20 |
-29:09:05.8 |
HIP 55576 |
15.63 |
| 2026-08-04 00:00 |
11:23:24.05 |
-29:08:55.9 |
HIP 55576 |
15.67 |
| 2026-08-04 12:00 |
11:23:27.93 |
-29:08:46.5 |
HIP 55689 |
15.66 |
| 2026-08-05 00:00 |
11:23:31.83 |
-29:08:37.5 |
HIP 55689 |
14.84 |
| 2026-08-05 12:00 |
11:23:35.77 |
-29:08:28.9 |
HIP 55689 |
14.01 |
| 2026-08-06 00:00 |
11:23:39.72 |
-29:08:20.7 |
HIP 55689 |
13.18 |
| 2026-08-06 12:00 |
11:23:43.70 |
-29:08:12.9 |
HIP 55689 |
12.36 |
| 2026-08-07 00:00 |
11:23:47.71 |
-29:08:05.5 |
HIP 55689 |
11.53 |
| 2026-08-07 12:00 |
11:23:51.74 |
-29:07:58.5 |
HIP 55689 |
10.71 |
| 2026-08-08 00:00 |
11:23:55.79 |
-29:07:52.0 |
HIP 55689 |
9.89 |
| 2026-08-08 12:00 |
11:23:59.87 |
-29:07:45.9 |
HIP 55689 |
9.08 |
| 2026-08-09 00:00 |
11:24:03.97 |
-29:07:40.1 |
HIP 55689 |
8.27 |
| 2026-08-09 12:00 |
11:24:08.10 |
-29:07:34.8 |
HIP 55689 |
7.48 |
| 2026-08-10 00:00 |
11:24:12.24 |
-29:07:29.9 |
HIP 55689 |
6.72 |
| 2026-08-10 12:00 |
11:24:16.41 |
-29:07:25.4 |
HIP 55689 |
5.98 |
| 2026-08-11 00:00 |
11:24:20.60 |
-29:07:21.4 |
HIP 55689 |
5.30 |
| 2026-08-11 12:00 |
11:24:24.82 |
-29:07:17.7 |
HIP 55689 |
4.68 |
| 2026-08-12 00:00 |
11:24:29.05 |
-29:07:14.4 |
HIP 55689 |
4.17 |
| 2026-08-12 12:00 |
11:24:33.31 |
-29:07:11.6 |
HIP 55689 |
3.81 |
| 2026-08-13 00:00 |
11:24:37.59 |
-29:07:09.2 |
HIP 55689 |
3.65 |
| 2026-08-13 12:00 |
11:24:41.88 |
-29:07:07.1 |
HIP 55689 |
3.72 |
| 2026-08-14 00:00 |
11:24:46.20 |
-29:07:05.5 |
HIP 55689 |
4.01 |
| 2026-08-14 12:00 |
11:24:50.54 |
-29:07:04.3 |
HIP 55689 |
4.49 |
| 2026-08-15 00:00 |
11:24:54.90 |
-29:07:03.5 |
HIP 55689 |
5.09 |
| 2026-08-15 12:00 |
11:24:59.28 |
-29:07:03.1 |
HIP 55689 |
5.78 |
| 2026-08-16 00:00 |
11:25:03.67 |
-29:07:03.2 |
HIP 55689 |
6.55 |
| 2026-08-16 12:00 |
11:25:08.09 |
-29:07:03.6 |
HIP 55689 |
7.35 |
| 2026-08-17 00:00 |
11:25:12.52 |
-29:07:04.4 |
HIP 55689 |
8.20 |
| 2026-08-17 12:00 |
11:25:16.97 |
-29:07:05.6 |
HIP 55689 |
9.07 |
| 2026-08-18 00:00 |
11:25:21.44 |
-29:07:07.3 |
HIP 55689 |
9.95 |
| 2026-08-18 12:00 |
11:25:25.92 |
-29:07:09.3 |
HIP 55689 |
10.86 |
| 2026-08-19 00:00 |
11:25:30.42 |
-29:07:11.7 |
HIP 55689 |
11.78 |