| 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) |
| 2026-06-01 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 |
| 2026-06-02 12:00 |
11:20:04.40 |
-30:18:50.1 |
HIP 55338 |
8.12 |
| 2026-06-03 00:00 |
11:20:03.24 |
-30:17:56.9 |
HIP 55292 |
8.18 |
| 2026-06-03 12:00 |
11:20:02.13 |
-30:17:03.9 |
HIP 55292 |
8.15 |
| 2026-06-04 00:00 |
11:20:01.06 |
-30:16:11.1 |
HIP 55292 |
8.23 |
| 2026-06-04 12:00 |
11:20:00.05 |
-30:15:18.6 |
HIP 55292 |
8.41 |
| 2026-06-05 00:00 |
11:19:59.08 |
-30:14:26.2 |
HIP 55292 |
8.70 |
| 2026-06-05 12:00 |
11:19:58.17 |
-30:13:34.1 |
HIP 55292 |
9.06 |
| 2026-06-06 00:00 |
11:19:57.30 |
-30:12:42.2 |
HIP 55292 |
9.51 |
| 2026-06-06 12:00 |
11:19:56.48 |
-30:11:50.6 |
HIP 55292 |
10.01 |
| 2026-06-07 00:00 |
11:19:55.71 |
-30:10:59.2 |
HIP 55292 |
10.57 |
| 2026-06-07 12:00 |
11:19:54.99 |
-30:10:08.0 |
HIP 55292 |
11.17 |
| 2026-06-08 00:00 |
11:19:54.32 |
-30:09:17.1 |
HIP 55292 |
11.81 |
| 2026-06-08 12:00 |
11:19:53.70 |
-30:08:26.4 |
HIP 55292 |
12.47 |
| 2026-06-09 00:00 |
11:19:53.13 |
-30:07:35.9 |
HIP 55292 |
13.16 |
| 2026-06-09 12:00 |
11:19:52.61 |
-30:06:45.7 |
HIP 55292 |
13.87 |
| 2026-06-10 00:00 |
11:19:52.14 |
-30:05:55.8 |
HIP 55292 |
14.59 |
| 2026-06-10 12:00 |
11:19:51.71 |
-30:05:06.1 |
HIP 55292 |
15.32 |
| 2026-06-11 00:00 |
11:19:51.34 |
-30:04:16.7 |
HIP 55292 |
16.07 |
| 2026-06-11 12:00 |
11:19:51.01 |
-30:03:27.5 |
HIP 55292 |
16.81 |
| 2026-06-12 00:00 |
11:19:50.73 |
-30:02:38.7 |
HIP 55292 |
17.57 |
| 2026-06-12 12:00 |
11:19:50.50 |
-30:01:50.0 |
HIP 55292 |
18.33 |
| 2026-06-13 00:00 |
11:19:50.32 |
-30:01:01.7 |
HIP 55444 |
18.87 |
| 2026-06-13 12:00 |
11:19:50.19 |
-30:00:13.6 |
HIP 55444 |
18.82 |
| 2026-06-14 00:00 |
11:19:50.11 |
-29:59:25.9 |
HIP 55444 |
18.80 |
| 2026-06-14 12:00 |
11:19:50.07 |
-29:58:38.4 |
HIP 55444 |
18.81 |
| 2026-06-15 00:00 |
11:19:50.08 |
-29:57:51.2 |
HIP 55444 |
18.83 |
| 2026-06-15 12:00 |
11:19:50.15 |
-29:57:04.2 |
HIP 55444 |
18.88 |
| 2026-06-16 00:00 |
11:19:50.26 |
-29:56:17.6 |
HIP 55444 |
18.95 |
| 2026-06-16 12:00 |
11:19:50.41 |
-29:55:31.3 |
HIP 55444 |
19.04 |
| 2026-06-17 00:00 |
11:19:50.62 |
-29:54:45.2 |
HIP 55444 |
19.15 |
| 2026-06-17 12:00 |
11:19:50.87 |
-29:53:59.5 |
HIP 55444 |
19.27 |
| 2026-06-18 00:00 |
11:19:51.17 |
-29:53:14.1 |
HIP 55444 |
19.42 |
| 2026-06-18 12:00 |
11:19:51.52 |
-29:52:29.0 |
HIP 55444 |
19.58 |
| 2026-06-19 00:00 |
11:19:51.91 |
-29:51:44.2 |
HIP 55444 |
19.76 |
| 2026-06-19 12:00 |
11:19:52.36 |
-29:50:59.7 |
HIP 55444 |
19.95 |
| 2026-06-20 00:00 |
11:19:52.84 |
-29:50:15.5 |
HIP 55444 |
20.16 |
| 2026-06-20 12:00 |
11:19:53.38 |
-29:49:31.6 |
HIP 55444 |
20.38 |
| 2026-06-21 00:00 |
11:19:53.96 |
-29:48:48.1 |
HIP 55444 |
20.62 |
| 2026-06-21 12:00 |
11:19:54.59 |
-29:48:04.9 |
HIP 55444 |
20.86 |
| 2026-06-22 00:00 |
11:19:55.26 |
-29:47:22.0 |
HIP 55444 |
21.12 |