메타데이터
| 항목 |
값 |
| 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 궤도요소
| 항목 |
값 |
| 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 |
밝기
산란 + 전체 선형
$$
M_a = (6.323 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
6.323 |
| n |
6.000 |
| gf |
0.998 |
| gb |
-0.968 |
| k |
1.000 |
| δ90 |
10.000 |
| 파라미터 |
기호 |
범위 |
설명 |
| 태양·지구거리 1 AU에서의 절대등급 |
H0 |
-5 to 20 |
혜성의 고유 밝기 |
| 광도 기울기 파라미터 |
n |
2 to 6 |
태양거리 변화에 따른 밝기 변화율 |
| 전방 산란 비대칭 계수 |
gf |
0.8 to 1 |
전방 산란의 강도 |
| 후방 산란 비대칭 계수 |
gb |
-1 to -0.5 |
후방 산란의 강도 |
| 분할 계수 |
k |
0.8 to 1 |
전·후방 산란 기여도 비율 |
| 먼지/가스 밝기 비 |
δ90 |
1 to 10 |
코마에서 먼지 산란 대비 가스 방출의 상대 기여 |
참고: EPSC-DPS2025-160
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
02:54:35.20 |
+63:17:51.3 |
HIP 13394 |
16.33 |
| 2026-07-29 12:00 |
02:54:36.17 |
+63:19:04.7 |
HIP 13394 |
15.96 |
| 2026-07-30 00:00 |
02:54:37.05 |
+63:20:18.0 |
HIP 13394 |
15.67 |
| 2026-07-30 12:00 |
02:54:37.84 |
+63:21:31.3 |
HIP 13394 |
15.46 |
| 2026-07-31 00:00 |
02:54:38.52 |
+63:22:44.6 |
HIP 13394 |
15.33 |
| 2026-07-31 12:00 |
02:54:39.10 |
+63:23:57.8 |
HIP 13394 |
15.29 |
| 2026-08-01 00:00 |
02:54:39.59 |
+63:25:11.0 |
HIP 13394 |
15.34 |
| 2026-08-01 12:00 |
02:54:39.97 |
+63:26:24.2 |
HIP 13471 |
14.61 |
| 2026-08-02 00:00 |
02:54:40.25 |
+63:27:37.3 |
HIP 13471 |
13.61 |
| 2026-08-02 12:00 |
02:54:40.44 |
+63:28:50.3 |
HIP 13471 |
12.65 |
| 2026-08-03 00:00 |
02:54:40.52 |
+63:30:03.3 |
HIP 13471 |
11.72 |
| 2026-08-03 12:00 |
02:54:40.50 |
+63:31:16.2 |
HIP 13471 |
10.84 |
| 2026-08-04 00:00 |
02:54:40.37 |
+63:32:29.1 |
HIP 13471 |
10.03 |
| 2026-08-04 12:00 |
02:54:40.15 |
+63:33:41.8 |
HIP 13471 |
9.29 |
| 2026-08-05 00:00 |
02:54:39.82 |
+63:34:54.6 |
HIP 13471 |
8.65 |
| 2026-08-05 12:00 |
02:54:39.39 |
+63:36:07.2 |
HIP 13471 |
8.14 |
| 2026-08-06 00:00 |
02:54:38.85 |
+63:37:19.7 |
HIP 13471 |
7.76 |
| 2026-08-06 12:00 |
02:54:38.21 |
+63:38:32.2 |
HIP 13471 |
7.56 |
| 2026-08-07 00:00 |
02:54:37.47 |
+63:39:44.5 |
HIP 13471 |
7.53 |
| 2026-08-07 12:00 |
02:54:36.62 |
+63:40:56.8 |
HIP 13471 |
7.69 |
| 2026-08-08 00:00 |
02:54:35.67 |
+63:42:09.0 |
HIP 13471 |
8.01 |
| 2026-08-08 12:00 |
02:54:34.61 |
+63:43:21.0 |
HIP 13471 |
8.48 |
| 2026-08-09 00:00 |
02:54:33.44 |
+63:44:33.0 |
HIP 13471 |
9.08 |
| 2026-08-09 12:00 |
02:54:32.17 |
+63:45:44.8 |
HIP 13471 |
9.79 |
| 2026-08-10 00:00 |
02:54:30.79 |
+63:46:56.5 |
HIP 13471 |
10.57 |
| 2026-08-10 12:00 |
02:54:29.30 |
+63:48:08.1 |
HIP 13471 |
11.42 |
| 2026-08-11 00:00 |
02:54:27.71 |
+63:49:19.6 |
HIP 13471 |
12.32 |
| 2026-08-11 12:00 |
02:54:26.00 |
+63:50:30.9 |
HIP 13471 |
13.27 |
| 2026-08-12 00:00 |
02:54:24.19 |
+63:51:42.1 |
HIP 13471 |
14.24 |
| 2026-08-12 12:00 |
02:54:22.28 |
+63:52:53.1 |
HIP 13471 |
15.24 |
| 2026-08-13 00:00 |
02:54:20.25 |
+63:54:04.0 |
HIP 13471 |
16.26 |
| 2026-08-13 12:00 |
02:54:18.11 |
+63:55:14.7 |
HIP 13608 |
15.78 |
| 2026-08-14 00:00 |
02:54:15.87 |
+63:56:25.3 |
HIP 13608 |
14.84 |
| 2026-08-14 12:00 |
02:54:13.51 |
+63:57:35.7 |
HIP 13608 |
13.96 |
| 2026-08-15 00:00 |
02:54:11.05 |
+63:58:45.9 |
HIP 13608 |
13.13 |
| 2026-08-15 12:00 |
02:54:08.48 |
+63:59:55.9 |
HIP 13608 |
12.38 |
| 2026-08-16 00:00 |
02:54:05.79 |
+64:01:05.8 |
HIP 13608 |
11.71 |
| 2026-08-16 12:00 |
02:54:03.00 |
+64:02:15.5 |
HIP 13608 |
11.14 |
| 2026-08-17 00:00 |
02:54:00.10 |
+64:03:25.0 |
HIP 13608 |
10.69 |
| 2026-08-17 12:00 |
02:53:57.08 |
+64:04:34.3 |
HIP 13608 |
10.37 |
| 2026-08-18 00:00 |
02:53:53.96 |
+64:05:43.4 |
HIP 13608 |
10.20 |
| 2026-08-18 12:00 |
02:53:50.72 |
+64:06:52.3 |
HIP 13608 |
10.17 |
| 2026-08-19 00:00 |
02:53:47.38 |
+64:08:01.0 |
HIP 13608 |
10.30 |