메타데이터
| 항목 |
값 |
| Designation |
C/1992 A1 (Helin-Alu) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1992-07-08T17:12:35.945280Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:41Z |
| Obs used |
53 |
| NEO |
- |
| M1 |
12.200 |
| K1 |
4.500 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
1992-02-26.0000000 |
| e |
1.00425169 |
| q (au) |
3.016597 |
| a (au) |
-709.504993 |
| i (deg) |
39.271080 |
| Ω (om, deg) |
288.912404 |
| ω (w, deg) |
239.843091 |
| M (ma, deg) |
-0.006974 |
밝기
산란 + 전체 선형
$$
M_a = (5.138 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
5.138 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
20:45:26.41 |
+03:09:33.2 |
HIP 102438 |
0.69 |
| 2026-09-20 12:00 |
20:45:25.13 |
+03:09:20.5 |
HIP 102438 |
1.05 |
| 2026-09-21 00:00 |
20:45:23.87 |
+03:09:07.8 |
HIP 102438 |
1.42 |
| 2026-09-21 12:00 |
20:45:22.61 |
+03:08:55.1 |
HIP 102438 |
1.80 |
| 2026-09-22 00:00 |
20:45:21.38 |
+03:08:42.4 |
HIP 102438 |
2.17 |
| 2026-09-22 12:00 |
20:45:20.15 |
+03:08:29.7 |
HIP 102438 |
2.54 |
| 2026-09-23 00:00 |
20:45:18.94 |
+03:08:17.0 |
HIP 102438 |
2.91 |
| 2026-09-23 12:00 |
20:45:17.74 |
+03:08:04.3 |
HIP 102438 |
3.27 |
| 2026-09-24 00:00 |
20:45:16.56 |
+03:07:51.6 |
HIP 102438 |
3.63 |
| 2026-09-24 12:00 |
20:45:15.39 |
+03:07:38.8 |
HIP 102438 |
4.00 |
| 2026-09-25 00:00 |
20:45:14.24 |
+03:07:26.1 |
HIP 102438 |
4.35 |
| 2026-09-25 12:00 |
20:45:13.10 |
+03:07:13.4 |
HIP 102438 |
4.71 |
| 2026-09-26 00:00 |
20:45:11.97 |
+03:07:00.6 |
HIP 102438 |
5.06 |
| 2026-09-26 12:00 |
20:45:10.86 |
+03:06:47.9 |
HIP 102438 |
5.41 |
| 2026-09-27 00:00 |
20:45:09.76 |
+03:06:35.1 |
HIP 102438 |
5.76 |
| 2026-09-27 12:00 |
20:45:08.68 |
+03:06:22.4 |
HIP 102438 |
6.10 |
| 2026-09-28 00:00 |
20:45:07.61 |
+03:06:09.7 |
HIP 102438 |
6.44 |
| 2026-09-28 12:00 |
20:45:06.56 |
+03:05:56.9 |
HIP 102438 |
6.78 |
| 2026-09-29 00:00 |
20:45:05.52 |
+03:05:44.2 |
HIP 102438 |
7.11 |
| 2026-09-29 12:00 |
20:45:04.50 |
+03:05:31.5 |
HIP 102438 |
7.45 |
| 2026-09-30 00:00 |
20:45:03.49 |
+03:05:18.7 |
HIP 102438 |
7.77 |
| 2026-09-30 12:00 |
20:45:02.49 |
+03:05:06.0 |
HIP 102438 |
8.10 |
| 2026-10-01 00:00 |
20:45:01.52 |
+03:04:53.3 |
HIP 102438 |
8.42 |
| 2026-10-01 12:00 |
20:45:00.55 |
+03:04:40.6 |
HIP 102438 |
8.74 |
| 2026-10-02 00:00 |
20:44:59.60 |
+03:04:27.9 |
HIP 102438 |
9.06 |
| 2026-10-02 12:00 |
20:44:58.67 |
+03:04:15.2 |
HIP 102438 |
9.37 |
| 2026-10-03 00:00 |
20:44:57.75 |
+03:04:02.6 |
HIP 102438 |
9.69 |
| 2026-10-03 12:00 |
20:44:56.85 |
+03:03:49.9 |
HIP 102438 |
9.99 |
| 2026-10-04 00:00 |
20:44:55.96 |
+03:03:37.3 |
HIP 102438 |
10.30 |
| 2026-10-04 12:00 |
20:44:55.09 |
+03:03:24.6 |
HIP 102438 |
10.60 |
| 2026-10-05 00:00 |
20:44:54.24 |
+03:03:12.0 |
HIP 102438 |
10.90 |
| 2026-10-05 12:00 |
20:44:53.40 |
+03:02:59.4 |
HIP 102438 |
11.19 |
| 2026-10-06 00:00 |
20:44:52.58 |
+03:02:46.9 |
HIP 102438 |
11.48 |
| 2026-10-06 12:00 |
20:44:51.77 |
+03:02:34.3 |
HIP 102438 |
11.77 |
| 2026-10-07 00:00 |
20:44:50.98 |
+03:02:21.8 |
HIP 102438 |
12.06 |
| 2026-10-07 12:00 |
20:44:50.20 |
+03:02:09.3 |
HIP 102438 |
12.34 |
| 2026-10-08 00:00 |
20:44:49.44 |
+03:01:56.8 |
HIP 102438 |
12.62 |
| 2026-10-08 12:00 |
20:44:48.70 |
+03:01:44.3 |
HIP 102438 |
12.90 |
| 2026-10-09 00:00 |
20:44:47.98 |
+03:01:31.9 |
HIP 102438 |
13.17 |
| 2026-10-09 12:00 |
20:44:47.27 |
+03:01:19.4 |
HIP 102438 |
13.44 |
| 2026-10-10 00:00 |
20:44:46.57 |
+03:01:07.1 |
HIP 102438 |
13.70 |
| 2026-10-10 12:00 |
20:44:45.90 |
+03:00:54.7 |
HIP 102438 |
13.97 |
| 2026-10-11 00:00 |
20:44:45.24 |
+03:00:42.4 |
HIP 102438 |
14.23 |