| Parameter |
Value |
| Designation |
C/2018 E2 (Barros) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2017-12-23T16:27:32.230080Z |
| Orbit solution date (soln_date, UTC) |
2022-07-06T03:12:21Z |
| Obs used |
62 |
| NEO |
- |
| M1 |
9.900 |
| K1 |
10.250 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2018-03-12T22:14:13.056000Z |
| Discovery magnitude (MPC) |
19.40 T |
| Discovery observatory (MPC) |
Y00 · SONEAR Observatory, Oliveira |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2018-03-25.0000000 |
| e |
0.99760072 |
| q (au) |
3.922284 |
| a (au) |
1634.776323 |
| i (deg) |
97.742513 |
| Ω (om, deg) |
67.202099 |
| ω (w, deg) |
277.481389 |
| M (ma, deg) |
0.001362 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.323 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.323 |
| n |
6.000 |
| gf |
0.998 |
| gb |
-0.968 |
| 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 |
02:46:25.43 |
+65:10:24.7 |
HIP 13033 |
8.11 |
| 2026-09-20 12:00 |
02:46:15.12 |
+65:11:09.5 |
HIP 13033 |
9.42 |
| 2026-09-21 00:00 |
02:46:04.71 |
+65:11:53.8 |
HIP 13033 |
10.74 |
| 2026-09-21 12:00 |
02:45:54.21 |
+65:12:37.5 |
HIP 13033 |
12.06 |
| 2026-09-22 00:00 |
02:45:43.61 |
+65:13:20.8 |
HIP 13033 |
13.38 |
| 2026-09-22 12:00 |
02:45:32.93 |
+65:14:03.5 |
HIP 13033 |
14.71 |
| 2026-09-23 00:00 |
02:45:22.15 |
+65:14:45.6 |
HIP 13033 |
16.04 |
| 2026-09-23 12:00 |
02:45:11.28 |
+65:15:27.3 |
HIP 13033 |
17.37 |
| 2026-09-24 00:00 |
02:45:00.32 |
+65:16:08.3 |
HIP 13033 |
18.70 |
| 2026-09-24 12:00 |
02:44:49.27 |
+65:16:48.8 |
HIP 13033 |
20.04 |
| 2026-09-25 00:00 |
02:44:38.13 |
+65:17:28.8 |
HIP 13033 |
21.38 |
| 2026-09-25 12:00 |
02:44:26.90 |
+65:18:08.2 |
HIP 13033 |
22.72 |
| 2026-09-26 00:00 |
02:44:15.59 |
+65:18:47.1 |
HIP 13033 |
24.07 |
| 2026-09-26 12:00 |
02:44:04.19 |
+65:19:25.3 |
HIP 13033 |
25.41 |
| 2026-09-27 00:00 |
02:43:52.70 |
+65:20:03.1 |
HIP 12512 |
25.64 |
| 2026-09-27 12:00 |
02:43:41.13 |
+65:20:40.2 |
HIP 12512 |
24.37 |
| 2026-09-28 00:00 |
02:43:29.47 |
+65:21:16.8 |
HIP 12512 |
23.11 |
| 2026-09-28 12:00 |
02:43:17.74 |
+65:21:52.7 |
HIP 12512 |
21.86 |
| 2026-09-29 00:00 |
02:43:05.92 |
+65:22:28.1 |
HIP 12512 |
20.63 |
| 2026-09-29 12:00 |
02:42:54.01 |
+65:23:02.9 |
HIP 12512 |
19.41 |
| 2026-09-30 00:00 |
02:42:42.03 |
+65:23:37.2 |
HIP 12512 |
18.23 |
| 2026-09-30 12:00 |
02:42:29.97 |
+65:24:10.8 |
HIP 12512 |
17.07 |
| 2026-10-01 00:00 |
02:42:17.83 |
+65:24:43.8 |
HIP 12512 |
15.96 |
| 2026-10-01 12:00 |
02:42:05.60 |
+65:25:16.2 |
HIP 12512 |
14.89 |
| 2026-10-02 00:00 |
02:41:53.31 |
+65:25:48.0 |
HIP 12512 |
13.88 |
| 2026-10-02 12:00 |
02:41:40.93 |
+65:26:19.3 |
HIP 12512 |
12.95 |
| 2026-10-03 00:00 |
02:41:28.48 |
+65:26:49.8 |
HIP 12512 |
12.12 |
| 2026-10-03 12:00 |
02:41:15.96 |
+65:27:19.8 |
HIP 12512 |
11.40 |
| 2026-10-04 00:00 |
02:41:03.36 |
+65:27:49.2 |
HIP 12512 |
10.83 |
| 2026-10-04 12:00 |
02:40:50.69 |
+65:28:17.9 |
HIP 12370 |
10.12 |
| 2026-10-05 00:00 |
02:40:37.95 |
+65:28:46.0 |
HIP 12370 |
8.78 |
| 2026-10-05 12:00 |
02:40:25.13 |
+65:29:13.5 |
HIP 12370 |
7.46 |
| 2026-10-06 00:00 |
02:40:12.25 |
+65:29:40.3 |
HIP 12370 |
6.17 |
| 2026-10-06 12:00 |
02:39:59.30 |
+65:30:06.5 |
HIP 12370 |
4.94 |
| 2026-10-07 00:00 |
02:39:46.28 |
+65:30:32.1 |
HIP 12370 |
3.83 |
| 2026-10-07 12:00 |
02:39:33.20 |
+65:30:57.0 |
HIP 12370 |
2.97 |
| 2026-10-08 00:00 |
02:39:20.05 |
+65:31:21.3 |
HIP 12370 |
2.64 |
| 2026-10-08 12:00 |
02:39:06.83 |
+65:31:44.9 |
HIP 12370 |
3.01 |
| 2026-10-09 00:00 |
02:38:53.56 |
+65:32:07.9 |
HIP 12370 |
3.90 |
| 2026-10-09 12:00 |
02:38:40.22 |
+65:32:30.2 |
HIP 12370 |
5.04 |
| 2026-10-10 00:00 |
02:38:26.82 |
+65:32:51.8 |
HIP 12370 |
6.30 |
| 2026-10-10 12:00 |
02:38:13.36 |
+65:33:12.8 |
HIP 12370 |
7.61 |
| 2026-10-11 00:00 |
02:37:59.85 |
+65:33:33.1 |
HIP 12370 |
8.97 |