메타데이터
| 항목 |
값 |
| Designation |
C/2003 E1 (NEAT) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2004-02-13T14:31:17.322240Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:26Z |
| Obs used |
235 |
| NEO |
- |
| M1 |
13.700 |
| K1 |
4.500 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2003-10-15.0000000 |
| e |
0.76358329 |
| q (au) |
3.244959 |
| a (au) |
13.725590 |
| i (deg) |
33.537820 |
| Ω (om, deg) |
137.069987 |
| ω (w, deg) |
103.859277 |
| M (ma, deg) |
357.643002 |
밝기
산란 + 전체 선형
$$
M_a = (12.327 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
12.327 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.995 |
| 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 |
| 2003-03-09 |
2004-02-05 |
+11.2722 |
-7.340 |
| 2004-02-21 |
2004-09-11 |
+21.5365 |
-11.046 |
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 |
04:12:52.05 |
-11:11:51.6 |
HIP 19678 |
4.60 |
| 2026-06-01 12:00 |
04:12:57.20 |
-11:11:41.9 |
HIP 19678 |
4.32 |
| 2026-06-02 00:00 |
04:13:02.35 |
-11:11:32.5 |
HIP 19678 |
4.41 |
| 2026-06-02 12:00 |
04:13:07.49 |
-11:11:23.4 |
HIP 19678 |
4.85 |
| 2026-06-03 00:00 |
04:13:12.63 |
-11:11:14.6 |
HIP 19678 |
5.56 |
| 2026-06-03 12:00 |
04:13:17.77 |
-11:11:06.2 |
HIP 19678 |
6.44 |
| 2026-06-04 00:00 |
04:13:22.90 |
-11:10:58.0 |
HIP 19678 |
7.44 |
| 2026-06-04 12:00 |
04:13:28.03 |
-11:10:50.2 |
HIP 19678 |
8.51 |
| 2026-06-05 00:00 |
04:13:33.15 |
-11:10:42.7 |
HIP 19678 |
9.63 |
| 2026-06-05 12:00 |
04:13:38.27 |
-11:10:35.5 |
HIP 19678 |
10.78 |
| 2026-06-06 00:00 |
04:13:43.38 |
-11:10:28.7 |
HIP 19678 |
11.95 |
| 2026-06-06 12:00 |
04:13:48.48 |
-11:10:22.2 |
HIP 19678 |
13.14 |
| 2026-06-07 00:00 |
04:13:53.58 |
-11:10:16.0 |
HIP 19678 |
14.34 |
| 2026-06-07 12:00 |
04:13:58.67 |
-11:10:10.1 |
HIP 19678 |
15.55 |
| 2026-06-08 00:00 |
04:14:03.76 |
-11:10:04.5 |
HIP 19678 |
16.76 |
| 2026-06-08 12:00 |
04:14:08.84 |
-11:09:59.3 |
HIP 19678 |
17.98 |
| 2026-06-09 00:00 |
04:14:13.91 |
-11:09:54.4 |
HIP 19678 |
19.20 |
| 2026-06-09 12:00 |
04:14:18.97 |
-11:09:49.8 |
HIP 19678 |
20.42 |
| 2026-06-10 00:00 |
04:14:24.03 |
-11:09:45.6 |
HIP 19678 |
21.64 |
| 2026-06-10 12:00 |
04:14:29.08 |
-11:09:41.7 |
HIP 19678 |
22.87 |
| 2026-06-11 00:00 |
04:14:34.12 |
-11:09:38.1 |
HIP 19678 |
24.09 |
| 2026-06-11 12:00 |
04:14:39.15 |
-11:09:34.8 |
HIP 19678 |
25.32 |
| 2026-06-12 00:00 |
04:14:44.17 |
-11:09:31.8 |
HIP 19678 |
26.54 |
| 2026-06-12 12:00 |
04:14:49.18 |
-11:09:29.2 |
HIP 19678 |
27.76 |
| 2026-06-13 00:00 |
04:14:54.19 |
-11:09:26.9 |
HIP 19678 |
28.98 |
| 2026-06-13 12:00 |
04:14:59.18 |
-11:09:25.0 |
HIP 19678 |
30.20 |
| 2026-06-14 00:00 |
04:15:04.16 |
-11:09:23.3 |
HIP 19678 |
31.42 |
| 2026-06-14 12:00 |
04:15:09.13 |
-11:09:22.0 |
HIP 19678 |
32.64 |
| 2026-06-15 00:00 |
04:15:14.10 |
-11:09:21.1 |
HIP 19678 |
33.85 |
| 2026-06-15 12:00 |
04:15:19.05 |
-11:09:20.4 |
HIP 19678 |
35.06 |
| 2026-06-16 00:00 |
04:15:23.98 |
-11:09:20.1 |
HIP 19678 |
36.27 |
| 2026-06-16 12:00 |
04:15:28.91 |
-11:09:20.1 |
HIP 19804 |
36.63 |
| 2026-06-17 00:00 |
04:15:33.82 |
-11:09:20.4 |
HIP 19804 |
36.98 |
| 2026-06-17 12:00 |
04:15:38.73 |
-11:09:21.1 |
HIP 19804 |
37.38 |
| 2026-06-18 00:00 |
04:15:43.62 |
-11:09:22.1 |
HIP 19804 |
37.81 |
| 2026-06-18 12:00 |
04:15:48.49 |
-11:09:23.4 |
HIP 19804 |
38.28 |
| 2026-06-19 00:00 |
04:15:53.35 |
-11:09:25.1 |
HIP 19804 |
38.78 |
| 2026-06-19 12:00 |
04:15:58.20 |
-11:09:27.0 |
HIP 19804 |
39.32 |
| 2026-06-20 00:00 |
04:16:03.04 |
-11:09:29.4 |
HIP 19804 |
39.89 |
| 2026-06-20 12:00 |
04:16:07.86 |
-11:09:32.0 |
HIP 19804 |
40.49 |
| 2026-06-21 00:00 |
04:16:12.67 |
-11:09:34.9 |
HIP 19804 |
41.12 |
| 2026-06-21 12:00 |
04:16:17.46 |
-11:09:38.2 |
HIP 19804 |
41.77 |
| 2026-06-22 00:00 |
04:16:22.23 |
-11:09:41.8 |
HIP 19804 |
42.45 |