메타데이터
| 항목 |
값 |
| Designation |
C/1990 E1 (Cernis-Kiuchi-Nakamura) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1990-03-17T07:48:46.033920Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:38Z |
| Obs used |
89 |
| NEO |
- |
| M1 |
7.100 |
| K1 |
39.500 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
1990-04-01.0000000 |
| e |
1.00000000 |
| q (au) |
1.068341 |
| a (au) |
- |
| i (deg) |
48.142430 |
| Ω (om, deg) |
348.444903 |
| ω (w, deg) |
100.620374 |
| M (ma, deg) |
- |
밝기
산란 + 전체 선형
$$
M_a = (6.813 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
6.813 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.998 |
| 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 |
| 1990-03-17 |
1990-05-26 |
+18.7801 |
-0.670 |
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 |
15:31:49.48 |
-69:46:48.0 |
HIP 76002 |
4.35 |
| 2026-06-01 12:00 |
15:31:44.29 |
-69:46:38.2 |
HIP 76002 |
4.23 |
| 2026-06-02 00:00 |
15:31:39.10 |
-69:46:28.2 |
HIP 76002 |
4.15 |
| 2026-06-02 12:00 |
15:31:33.93 |
-69:46:18.0 |
HIP 76002 |
4.14 |
| 2026-06-03 00:00 |
15:31:28.78 |
-69:46:07.6 |
HIP 76002 |
4.18 |
| 2026-06-03 12:00 |
15:31:23.64 |
-69:45:57.1 |
HIP 76002 |
4.28 |
| 2026-06-04 00:00 |
15:31:18.51 |
-69:45:46.4 |
HIP 76002 |
4.43 |
| 2026-06-04 12:00 |
15:31:13.40 |
-69:45:35.5 |
HIP 76002 |
4.62 |
| 2026-06-05 00:00 |
15:31:08.31 |
-69:45:24.4 |
HIP 76002 |
4.86 |
| 2026-06-05 12:00 |
15:31:03.23 |
-69:45:13.2 |
HIP 76002 |
5.14 |
| 2026-06-06 00:00 |
15:30:58.18 |
-69:45:01.7 |
HIP 76002 |
5.45 |
| 2026-06-06 12:00 |
15:30:53.13 |
-69:44:50.1 |
HIP 76002 |
5.78 |
| 2026-06-07 00:00 |
15:30:48.11 |
-69:44:38.3 |
HIP 76002 |
6.13 |
| 2026-06-07 12:00 |
15:30:43.10 |
-69:44:26.4 |
HIP 76002 |
6.50 |
| 2026-06-08 00:00 |
15:30:38.12 |
-69:44:14.3 |
HIP 76002 |
6.88 |
| 2026-06-08 12:00 |
15:30:33.15 |
-69:44:02.0 |
HIP 76002 |
7.28 |
| 2026-06-09 00:00 |
15:30:28.20 |
-69:43:49.5 |
HIP 76002 |
7.69 |
| 2026-06-09 12:00 |
15:30:23.27 |
-69:43:36.8 |
HIP 76002 |
8.11 |
| 2026-06-10 00:00 |
15:30:18.36 |
-69:43:24.0 |
HIP 76002 |
8.53 |
| 2026-06-10 12:00 |
15:30:13.48 |
-69:43:11.0 |
HIP 76002 |
8.96 |
| 2026-06-11 00:00 |
15:30:08.61 |
-69:42:57.9 |
HIP 76002 |
9.40 |
| 2026-06-11 12:00 |
15:30:03.76 |
-69:42:44.5 |
HIP 76002 |
9.84 |
| 2026-06-12 00:00 |
15:29:58.94 |
-69:42:31.0 |
HIP 76002 |
10.28 |
| 2026-06-12 12:00 |
15:29:54.14 |
-69:42:17.4 |
HIP 76002 |
10.73 |
| 2026-06-13 00:00 |
15:29:49.36 |
-69:42:03.6 |
HIP 76002 |
11.18 |
| 2026-06-13 12:00 |
15:29:44.60 |
-69:41:49.6 |
HIP 76002 |
11.63 |
| 2026-06-14 00:00 |
15:29:39.87 |
-69:41:35.4 |
HIP 76002 |
12.09 |
| 2026-06-14 12:00 |
15:29:35.16 |
-69:41:21.1 |
HIP 76002 |
12.54 |
| 2026-06-15 00:00 |
15:29:30.48 |
-69:41:06.7 |
HIP 76002 |
13.00 |
| 2026-06-15 12:00 |
15:29:25.82 |
-69:40:52.1 |
HIP 76002 |
13.46 |
| 2026-06-16 00:00 |
15:29:21.19 |
-69:40:37.3 |
HIP 76002 |
13.92 |
| 2026-06-16 12:00 |
15:29:16.58 |
-69:40:22.4 |
HIP 76002 |
14.38 |
| 2026-06-17 00:00 |
15:29:11.99 |
-69:40:07.3 |
HIP 76002 |
14.85 |
| 2026-06-17 12:00 |
15:29:07.44 |
-69:39:52.0 |
HIP 76002 |
15.31 |
| 2026-06-18 00:00 |
15:29:02.91 |
-69:39:36.7 |
HIP 76002 |
15.77 |
| 2026-06-18 12:00 |
15:28:58.40 |
-69:39:21.1 |
HIP 76002 |
16.23 |
| 2026-06-19 00:00 |
15:28:53.92 |
-69:39:05.4 |
HIP 76002 |
16.70 |
| 2026-06-19 12:00 |
15:28:49.48 |
-69:38:49.6 |
HIP 76002 |
17.16 |
| 2026-06-20 00:00 |
15:28:45.06 |
-69:38:33.6 |
HIP 76002 |
17.63 |
| 2026-06-20 12:00 |
15:28:40.66 |
-69:38:17.5 |
HIP 76002 |
18.09 |
| 2026-06-21 00:00 |
15:28:36.30 |
-69:38:01.3 |
HIP 76002 |
18.56 |
| 2026-06-21 12:00 |
15:28:31.96 |
-69:37:44.9 |
HIP 76002 |
19.02 |
| 2026-06-22 00:00 |
15:28:27.66 |
-69:37:28.3 |
HIP 76002 |
19.48 |