메타데이터
| 항목 |
값 |
| Designation |
C/2018 E1 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2018-04-17T07:44:27.119040Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:40Z |
| Obs used |
227 |
| NEO |
- |
| M1 |
11.400 |
| K1 |
8.750 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2018-03-10T05:26:27.744000Z |
| Discovery magnitude (MPC) |
16.80 T |
| Discovery observatory (MPC) |
T05 · ATLAS-HKO, Haleakala |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2018-04-14.0000000 |
| e |
0.95034655 |
| q (au) |
2.705441 |
| a (au) |
54.486472 |
| i (deg) |
72.479572 |
| Ω (om, deg) |
146.840866 |
| ω (w, deg) |
299.471840 |
| M (ma, deg) |
359.991858 |
밝기
산란 + 전체 선형
$$
M_a = (9.955 + 3.883\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
9.955 |
| n |
3.883 |
| gf |
1.000 |
| gb |
-1.000 |
| 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
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) |
끝 (UTC) |
a |
b |
| 2015-08-11 |
2018-04-08 |
-0.9341 |
+0.425 |
| 2018-04-19 |
2019-04-23 |
+8.4028 |
-4.732 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
15:48:30.04 |
+56:10:38.1 |
HIP 77438 |
4.70 |
| 2026-06-01 12:00 |
15:48:20.87 |
+56:10:24.0 |
HIP 77438 |
4.64 |
| 2026-06-02 00:00 |
15:48:11.72 |
+56:10:09.1 |
HIP 77438 |
4.91 |
| 2026-06-02 12:00 |
15:48:02.59 |
+56:09:53.5 |
HIP 77438 |
5.48 |
| 2026-06-03 00:00 |
15:47:53.49 |
+56:09:37.0 |
HIP 77438 |
6.25 |
| 2026-06-03 12:00 |
15:47:44.42 |
+56:09:19.8 |
HIP 77438 |
7.17 |
| 2026-06-04 00:00 |
15:47:35.37 |
+56:09:01.8 |
HIP 77438 |
8.19 |
| 2026-06-04 12:00 |
15:47:26.35 |
+56:08:43.1 |
HIP 77438 |
9.26 |
| 2026-06-05 00:00 |
15:47:17.36 |
+56:08:23.6 |
HIP 77438 |
10.38 |
| 2026-06-05 12:00 |
15:47:08.40 |
+56:08:03.3 |
HIP 77438 |
11.53 |
| 2026-06-06 00:00 |
15:46:59.47 |
+56:07:42.3 |
HIP 77438 |
12.71 |
| 2026-06-06 12:00 |
15:46:50.57 |
+56:07:20.4 |
HIP 77438 |
13.90 |
| 2026-06-07 00:00 |
15:46:41.71 |
+56:06:57.9 |
HIP 77438 |
15.10 |
| 2026-06-07 12:00 |
15:46:32.87 |
+56:06:34.6 |
HIP 77438 |
16.31 |
| 2026-06-08 00:00 |
15:46:24.07 |
+56:06:10.5 |
HIP 77438 |
17.52 |
| 2026-06-08 12:00 |
15:46:15.31 |
+56:05:45.6 |
HIP 77438 |
18.75 |
| 2026-06-09 00:00 |
15:46:06.58 |
+56:05:20.1 |
HIP 77438 |
19.97 |
| 2026-06-09 12:00 |
15:45:57.89 |
+56:04:53.7 |
HIP 77438 |
21.21 |
| 2026-06-10 00:00 |
15:45:49.23 |
+56:04:26.6 |
HIP 77438 |
22.44 |
| 2026-06-10 12:00 |
15:45:40.61 |
+56:03:58.8 |
HIP 77438 |
23.67 |
| 2026-06-11 00:00 |
15:45:32.04 |
+56:03:30.3 |
HIP 77438 |
24.91 |
| 2026-06-11 12:00 |
15:45:23.50 |
+56:03:01.0 |
HIP 77438 |
26.15 |
| 2026-06-12 00:00 |
15:45:15.00 |
+56:02:30.9 |
HIP 77438 |
27.39 |
| 2026-06-12 12:00 |
15:45:06.54 |
+56:02:00.2 |
HIP 77438 |
28.63 |
| 2026-06-13 00:00 |
15:44:58.13 |
+56:01:28.7 |
HIP 77438 |
29.87 |
| 2026-06-13 12:00 |
15:44:49.76 |
+56:00:56.4 |
HIP 77438 |
31.11 |
| 2026-06-14 00:00 |
15:44:41.43 |
+56:00:23.5 |
HIP 77438 |
32.35 |
| 2026-06-14 12:00 |
15:44:33.15 |
+55:59:49.8 |
HIP 77438 |
33.59 |
| 2026-06-15 00:00 |
15:44:24.91 |
+55:59:15.4 |
HIP 77438 |
34.83 |
| 2026-06-15 12:00 |
15:44:16.72 |
+55:58:40.3 |
HIP 77272 |
35.92 |
| 2026-06-16 00:00 |
15:44:08.58 |
+55:58:04.5 |
HIP 76740 |
35.14 |
| 2026-06-16 12:00 |
15:44:00.48 |
+55:57:28.0 |
HIP 76740 |
34.35 |
| 2026-06-17 00:00 |
15:43:52.44 |
+55:56:50.8 |
HIP 76740 |
33.60 |
| 2026-06-17 12:00 |
15:43:44.44 |
+55:56:12.9 |
HIP 76740 |
32.89 |
| 2026-06-18 00:00 |
15:43:36.49 |
+55:55:34.2 |
HIP 76740 |
32.23 |
| 2026-06-18 12:00 |
15:43:28.60 |
+55:54:54.9 |
HIP 76740 |
31.62 |
| 2026-06-19 00:00 |
15:43:20.75 |
+55:54:15.0 |
HIP 76740 |
31.07 |
| 2026-06-19 12:00 |
15:43:12.96 |
+55:53:34.3 |
HIP 76740 |
30.56 |
| 2026-06-20 00:00 |
15:43:05.23 |
+55:52:53.0 |
HIP 76740 |
30.12 |
| 2026-06-20 12:00 |
15:42:57.54 |
+55:52:11.0 |
HIP 76740 |
29.74 |
| 2026-06-21 00:00 |
15:42:49.91 |
+55:51:28.3 |
HIP 76740 |
29.42 |
| 2026-06-21 12:00 |
15:42:42.34 |
+55:50:45.0 |
HIP 76740 |
29.17 |
| 2026-06-22 00:00 |
15:42:34.82 |
+55:50:01.0 |
HIP 76740 |
28.98 |