| 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 |
1.000 |
| 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) |
| 2026-05-12 00:00 |
11:21:41.39 |
-30:59:28.6 |
HIP 55535 |
11.87 |
| 2026-05-12 12:00 |
11:21:38.10 |
-30:58:29.7 |
HIP 55535 |
12.13 |
| 2026-05-13 00:00 |
11:21:34.87 |
-30:57:30.9 |
HIP 55535 |
12.48 |
| 2026-05-13 12:00 |
11:21:31.67 |
-30:56:32.2 |
HIP 55535 |
12.93 |
| 2026-05-14 00:00 |
11:21:28.53 |
-30:55:33.4 |
HIP 55535 |
13.46 |
| 2026-05-14 12:00 |
11:21:25.43 |
-30:54:34.8 |
HIP 55535 |
14.06 |
| 2026-05-15 00:00 |
11:21:22.39 |
-30:53:36.2 |
HIP 55535 |
14.72 |
| 2026-05-15 12:00 |
11:21:19.39 |
-30:52:37.7 |
HIP 55535 |
15.43 |
| 2026-05-16 00:00 |
11:21:16.44 |
-30:51:39.2 |
HIP 55535 |
16.19 |
| 2026-05-16 12:00 |
11:21:13.54 |
-30:50:40.8 |
HIP 55535 |
16.98 |
| 2026-05-17 00:00 |
11:21:10.69 |
-30:49:42.5 |
HIP 55535 |
17.80 |
| 2026-05-17 12:00 |
11:21:07.88 |
-30:48:44.3 |
HIP 55535 |
18.64 |
| 2026-05-18 00:00 |
11:21:05.13 |
-30:47:46.2 |
HIP 55535 |
19.51 |
| 2026-05-18 12:00 |
11:21:02.43 |
-30:46:48.1 |
HIP 55535 |
20.39 |
| 2026-05-19 00:00 |
11:20:59.77 |
-30:45:50.2 |
HIP 55535 |
21.28 |
| 2026-05-19 12:00 |
11:20:57.17 |
-30:44:52.3 |
HIP 55535 |
22.19 |
| 2026-05-20 00:00 |
11:20:54.61 |
-30:43:54.6 |
HIP 55338 |
21.19 |
| 2026-05-20 12:00 |
11:20:52.10 |
-30:42:57.0 |
HIP 55338 |
20.10 |
| 2026-05-21 00:00 |
11:20:49.65 |
-30:41:59.4 |
HIP 55338 |
19.01 |
| 2026-05-21 12:00 |
11:20:47.24 |
-30:41:02.0 |
HIP 55338 |
17.94 |
| 2026-05-22 00:00 |
11:20:44.88 |
-30:40:04.8 |
HIP 55338 |
16.87 |
| 2026-05-22 12:00 |
11:20:42.58 |
-30:39:07.6 |
HIP 55338 |
15.82 |
| 2026-05-23 00:00 |
11:20:40.32 |
-30:38:10.6 |
HIP 55338 |
14.78 |
| 2026-05-23 12:00 |
11:20:38.11 |
-30:37:13.7 |
HIP 55338 |
13.75 |
| 2026-05-24 00:00 |
11:20:35.95 |
-30:36:17.0 |
HIP 55338 |
12.73 |
| 2026-05-24 12:00 |
11:20:33.84 |
-30:35:20.4 |
HIP 55338 |
11.73 |
| 2026-05-25 00:00 |
11:20:31.78 |
-30:34:23.9 |
HIP 55338 |
10.74 |
| 2026-05-25 12:00 |
11:20:29.78 |
-30:33:27.6 |
HIP 55338 |
9.78 |
| 2026-05-26 00:00 |
11:20:27.82 |
-30:32:31.5 |
HIP 55338 |
8.84 |
| 2026-05-26 12:00 |
11:20:25.91 |
-30:31:35.5 |
HIP 55338 |
7.93 |
| 2026-05-27 00:00 |
11:20:24.05 |
-30:30:39.7 |
HIP 55338 |
7.07 |
| 2026-05-27 12:00 |
11:20:22.24 |
-30:29:44.0 |
HIP 55338 |
6.26 |
| 2026-05-28 00:00 |
11:20:20.48 |
-30:28:48.5 |
HIP 55338 |
5.52 |
| 2026-05-28 12:00 |
11:20:18.77 |
-30:27:53.2 |
HIP 55338 |
4.90 |
| 2026-05-29 00:00 |
11:20:17.11 |
-30:26:58.0 |
HIP 55338 |
4.42 |
| 2026-05-29 12:00 |
11:20:15.50 |
-30:26:03.1 |
HIP 55338 |
4.13 |
| 2026-05-30 00:00 |
11:20:13.94 |
-30:25:08.3 |
HIP 55338 |
4.08 |
| 2026-05-30 12:00 |
11:20:12.43 |
-30:24:13.7 |
HIP 55338 |
4.26 |
| 2026-05-31 00:00 |
11:20:10.97 |
-30:23:19.3 |
HIP 55338 |
4.64 |
| 2026-05-31 12:00 |
11:20:09.55 |
-30:22:25.0 |
HIP 55338 |
5.18 |
| 2026-06-01 00:00 |
11:20:08.19 |
-30:21:31.0 |
HIP 55338 |
5.82 |
| 2026-06-01 12:00 |
11:20:06.88 |
-30:20:37.2 |
HIP 55338 |
6.55 |
| 2026-06-02 00:00 |
11:20:05.62 |
-30:19:43.6 |
HIP 55338 |
7.32 |