메타데이터
| 항목 |
값 |
| Designation |
C/1972 E1 (Bradfield) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1972-03-27T16:49:37.511040Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:19Z |
| Obs used |
85 |
| NEO |
- |
| M1 |
9.000 |
| K1 |
6.750 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
1972-04-24.0000000 |
| e |
0.99814080 |
| q (au) |
0.927218 |
| a (au) |
498.718434 |
| i (deg) |
123.692688 |
| Ω (om, deg) |
160.299080 |
| ω (w, deg) |
257.698891 |
| M (ma, deg) |
0.002416 |
밝기
산란 + 전체 선형
$$
M_a = (8.513 + 3.707\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
8.513 |
| n |
3.707 |
| gf |
0.999 |
| gb |
-0.500 |
| k |
0.978 |
| δ90 |
2.272 |
| 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) |
| 2026-06-01 00:00 |
08:31:40.96 |
+69:51:31.6 |
HIP 42086 |
16.79 |
| 2026-06-01 12:00 |
08:31:43.28 |
+69:51:15.7 |
HIP 42086 |
16.71 |
| 2026-06-02 00:00 |
08:31:45.62 |
+69:51:00.0 |
HIP 42086 |
16.64 |
| 2026-06-02 12:00 |
08:31:47.99 |
+69:50:44.2 |
HIP 42086 |
16.57 |
| 2026-06-03 00:00 |
08:31:50.39 |
+69:50:28.5 |
HIP 42086 |
16.51 |
| 2026-06-03 12:00 |
08:31:52.82 |
+69:50:12.9 |
HIP 42086 |
16.45 |
| 2026-06-04 00:00 |
08:31:55.27 |
+69:49:57.3 |
HIP 42086 |
16.39 |
| 2026-06-04 12:00 |
08:31:57.75 |
+69:49:41.8 |
HIP 42086 |
16.34 |
| 2026-06-05 00:00 |
08:32:00.25 |
+69:49:26.4 |
HIP 42086 |
16.29 |
| 2026-06-05 12:00 |
08:32:02.78 |
+69:49:11.0 |
HIP 42086 |
16.25 |
| 2026-06-06 00:00 |
08:32:05.34 |
+69:48:55.7 |
HIP 42086 |
16.21 |
| 2026-06-06 12:00 |
08:32:07.92 |
+69:48:40.5 |
HIP 42096 |
15.94 |
| 2026-06-07 00:00 |
08:32:10.53 |
+69:48:25.4 |
HIP 42096 |
15.63 |
| 2026-06-07 12:00 |
08:32:13.17 |
+69:48:10.3 |
HIP 42096 |
15.31 |
| 2026-06-08 00:00 |
08:32:15.83 |
+69:47:55.3 |
HIP 42096 |
14.99 |
| 2026-06-08 12:00 |
08:32:18.52 |
+69:47:40.3 |
HIP 42096 |
14.67 |
| 2026-06-09 00:00 |
08:32:21.23 |
+69:47:25.5 |
HIP 42096 |
14.35 |
| 2026-06-09 12:00 |
08:32:23.96 |
+69:47:10.7 |
HIP 42096 |
14.04 |
| 2026-06-10 00:00 |
08:32:26.72 |
+69:46:56.0 |
HIP 42096 |
13.72 |
| 2026-06-10 12:00 |
08:32:29.51 |
+69:46:41.3 |
HIP 42096 |
13.40 |
| 2026-06-11 00:00 |
08:32:32.32 |
+69:46:26.8 |
HIP 42096 |
13.08 |
| 2026-06-11 12:00 |
08:32:35.15 |
+69:46:12.3 |
HIP 42096 |
12.75 |
| 2026-06-12 00:00 |
08:32:38.01 |
+69:45:57.9 |
HIP 42096 |
12.43 |
| 2026-06-12 12:00 |
08:32:40.89 |
+69:45:43.6 |
HIP 42096 |
12.11 |
| 2026-06-13 00:00 |
08:32:43.80 |
+69:45:29.3 |
HIP 42096 |
11.79 |
| 2026-06-13 12:00 |
08:32:46.72 |
+69:45:15.2 |
HIP 42096 |
11.47 |
| 2026-06-14 00:00 |
08:32:49.67 |
+69:45:01.1 |
HIP 42096 |
11.15 |
| 2026-06-14 12:00 |
08:32:52.65 |
+69:44:47.1 |
HIP 42096 |
10.83 |
| 2026-06-15 00:00 |
08:32:55.64 |
+69:44:33.2 |
HIP 42096 |
10.51 |
| 2026-06-15 12:00 |
08:32:58.66 |
+69:44:19.4 |
HIP 42096 |
10.19 |
| 2026-06-16 00:00 |
08:33:01.70 |
+69:44:05.7 |
HIP 42096 |
9.87 |
| 2026-06-16 12:00 |
08:33:04.77 |
+69:43:52.0 |
HIP 42096 |
9.55 |
| 2026-06-17 00:00 |
08:33:07.85 |
+69:43:38.5 |
HIP 42096 |
9.23 |
| 2026-06-17 12:00 |
08:33:10.96 |
+69:43:25.0 |
HIP 42096 |
8.91 |
| 2026-06-18 00:00 |
08:33:14.08 |
+69:43:11.7 |
HIP 42096 |
8.59 |
| 2026-06-18 12:00 |
08:33:17.23 |
+69:42:58.4 |
HIP 42096 |
8.28 |
| 2026-06-19 00:00 |
08:33:20.40 |
+69:42:45.2 |
HIP 42096 |
7.96 |
| 2026-06-19 12:00 |
08:33:23.59 |
+69:42:32.1 |
HIP 42096 |
7.65 |
| 2026-06-20 00:00 |
08:33:26.80 |
+69:42:19.1 |
HIP 42096 |
7.34 |
| 2026-06-20 12:00 |
08:33:30.03 |
+69:42:06.2 |
HIP 42096 |
7.03 |
| 2026-06-21 00:00 |
08:33:33.27 |
+69:41:53.4 |
HIP 42096 |
6.73 |
| 2026-06-21 12:00 |
08:33:36.54 |
+69:41:40.7 |
HIP 42096 |
6.42 |
| 2026-06-22 00:00 |
08:33:39.83 |
+69:41:28.1 |
HIP 42096 |
6.13 |