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) |
| 2026-07-29 00:00 |
15:36:26.91 |
+54:30:58.9 |
HIP 76376 |
8.10 |
| 2026-07-29 12:00 |
15:36:24.82 |
+54:29:39.7 |
HIP 76376 |
9.11 |
| 2026-07-30 00:00 |
15:36:22.81 |
+54:28:20.4 |
HIP 76376 |
10.20 |
| 2026-07-30 12:00 |
15:36:20.88 |
+54:27:00.7 |
HIP 76509 |
10.92 |
| 2026-07-31 00:00 |
15:36:19.03 |
+54:25:40.9 |
HIP 76509 |
11.66 |
| 2026-07-31 12:00 |
15:36:17.27 |
+54:24:20.7 |
HIP 76509 |
12.50 |
| 2026-08-01 00:00 |
15:36:15.58 |
+54:23:00.4 |
HIP 76509 |
13.42 |
| 2026-08-01 12:00 |
15:36:13.98 |
+54:21:39.8 |
HIP 76509 |
14.40 |
| 2026-08-02 00:00 |
15:36:12.46 |
+54:20:19.0 |
HIP 76509 |
15.43 |
| 2026-08-02 12:00 |
15:36:11.02 |
+54:18:58.0 |
HIP 76509 |
16.51 |
| 2026-08-03 00:00 |
15:36:09.67 |
+54:17:36.8 |
HIP 76509 |
17.62 |
| 2026-08-03 12:00 |
15:36:08.39 |
+54:16:15.3 |
HIP 76509 |
18.76 |
| 2026-08-04 00:00 |
15:36:07.20 |
+54:14:53.7 |
HIP 76509 |
19.92 |
| 2026-08-04 12:00 |
15:36:06.09 |
+54:13:31.8 |
HIP 76311 |
19.62 |
| 2026-08-05 00:00 |
15:36:05.06 |
+54:12:09.8 |
HIP 76311 |
18.30 |
| 2026-08-05 12:00 |
15:36:04.11 |
+54:10:47.6 |
HIP 76311 |
16.99 |
| 2026-08-06 00:00 |
15:36:03.25 |
+54:09:25.2 |
HIP 76311 |
15.69 |
| 2026-08-06 12:00 |
15:36:02.46 |
+54:08:02.6 |
HIP 76311 |
14.42 |
| 2026-08-07 00:00 |
15:36:01.76 |
+54:06:39.9 |
HIP 76311 |
13.16 |
| 2026-08-07 12:00 |
15:36:01.14 |
+54:05:17.0 |
HIP 76311 |
11.94 |
| 2026-08-08 00:00 |
15:36:00.61 |
+54:03:53.9 |
HIP 76311 |
10.77 |
| 2026-08-08 12:00 |
15:36:00.15 |
+54:02:30.7 |
HIP 76311 |
9.66 |
| 2026-08-09 00:00 |
15:35:59.78 |
+54:01:07.3 |
HIP 76311 |
8.64 |
| 2026-08-09 12:00 |
15:35:59.49 |
+53:59:43.8 |
HIP 76311 |
7.74 |
| 2026-08-10 00:00 |
15:35:59.28 |
+53:58:20.2 |
HIP 76311 |
7.01 |
| 2026-08-10 12:00 |
15:35:59.15 |
+53:56:56.4 |
HIP 76311 |
6.52 |
| 2026-08-11 00:00 |
15:35:59.11 |
+53:55:32.5 |
HIP 76311 |
6.32 |
| 2026-08-11 12:00 |
15:35:59.15 |
+53:54:08.5 |
HIP 76311 |
6.43 |
| 2026-08-12 00:00 |
15:35:59.27 |
+53:52:44.4 |
HIP 76311 |
6.85 |
| 2026-08-12 12:00 |
15:35:59.47 |
+53:51:20.2 |
HIP 76311 |
7.52 |
| 2026-08-13 00:00 |
15:35:59.75 |
+53:49:55.9 |
HIP 76311 |
8.38 |
| 2026-08-13 12:00 |
15:36:00.12 |
+53:48:31.5 |
HIP 76311 |
9.39 |
| 2026-08-14 00:00 |
15:36:00.57 |
+53:47:07.1 |
HIP 76311 |
10.50 |
| 2026-08-14 12:00 |
15:36:01.10 |
+53:45:42.5 |
HIP 76311 |
11.68 |
| 2026-08-15 00:00 |
15:36:01.71 |
+53:44:17.9 |
HIP 76311 |
12.91 |
| 2026-08-15 12:00 |
15:36:02.40 |
+53:42:53.2 |
HIP 76311 |
14.19 |
| 2026-08-16 00:00 |
15:36:03.17 |
+53:41:28.4 |
HIP 76311 |
15.49 |
| 2026-08-16 12:00 |
15:36:04.02 |
+53:40:03.6 |
HIP 76295 |
16.37 |
| 2026-08-17 00:00 |
15:36:04.96 |
+53:38:38.8 |
HIP 76295 |
15.25 |
| 2026-08-17 12:00 |
15:36:05.97 |
+53:37:13.9 |
HIP 76295 |
14.20 |
| 2026-08-18 00:00 |
15:36:07.07 |
+53:35:49.0 |
HIP 76295 |
13.21 |
| 2026-08-18 12:00 |
15:36:08.24 |
+53:34:24.0 |
HIP 76295 |
12.32 |
| 2026-08-19 00:00 |
15:36:09.49 |
+53:32:59.1 |
HIP 76295 |
11.55 |