메타데이터
| 항목 |
값 |
| Designation |
C/1989 T1 (Helin-Roman-Alu) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1989-12-15T22:37:06.297600Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:38Z |
| Obs used |
120 |
| NEO |
- |
| M1 |
12.500 |
| K1 |
13.750 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
1989-11-17.0000000 |
| e |
0.99061399 |
| q (au) |
1.047319 |
| a (au) |
111.582949 |
| i (deg) |
46.036538 |
| Ω (om, deg) |
8.519172 |
| ω (w, deg) |
68.125993 |
| M (ma, deg) |
359.975798 |
밝기
산란 + 전체 선형
$$
M_a = (10.273 + 3.956\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
10.273 |
| n |
3.956 |
| 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
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) |
끝 (UTC) |
a |
b |
| 1989-10-01 |
1989-12-07 |
+5.1672 |
-0.345 |
| 1989-12-16 |
1990-11-17 |
-15.8129 |
+1.431 |
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 |
14:22:13.94 |
-53:14:46.2 |
HIP 70207 |
9.17 |
| 2026-06-01 12:00 |
14:22:11.21 |
-53:14:29.8 |
HIP 70207 |
8.77 |
| 2026-06-02 00:00 |
14:22:08.50 |
-53:14:13.2 |
HIP 70207 |
8.38 |
| 2026-06-02 12:00 |
14:22:05.80 |
-53:13:56.6 |
HIP 70207 |
7.99 |
| 2026-06-03 00:00 |
14:22:03.12 |
-53:13:39.8 |
HIP 70207 |
7.62 |
| 2026-06-03 12:00 |
14:22:00.45 |
-53:13:23.0 |
HIP 70207 |
7.26 |
| 2026-06-04 00:00 |
14:21:57.80 |
-53:13:06.0 |
HIP 70207 |
6.92 |
| 2026-06-04 12:00 |
14:21:55.17 |
-53:12:49.0 |
HIP 70207 |
6.59 |
| 2026-06-05 00:00 |
14:21:52.55 |
-53:12:31.8 |
HIP 70207 |
6.28 |
| 2026-06-05 12:00 |
14:21:49.95 |
-53:12:14.6 |
HIP 70207 |
6.00 |
| 2026-06-06 00:00 |
14:21:47.37 |
-53:11:57.2 |
HIP 70207 |
5.73 |
| 2026-06-06 12:00 |
14:21:44.81 |
-53:11:39.8 |
HIP 70207 |
5.50 |
| 2026-06-07 00:00 |
14:21:42.26 |
-53:11:22.3 |
HIP 70207 |
5.30 |
| 2026-06-07 12:00 |
14:21:39.73 |
-53:11:04.7 |
HIP 70207 |
5.13 |
| 2026-06-08 00:00 |
14:21:37.22 |
-53:10:46.9 |
HIP 70207 |
5.00 |
| 2026-06-08 12:00 |
14:21:34.73 |
-53:10:29.1 |
HIP 70207 |
4.91 |
| 2026-06-09 00:00 |
14:21:32.26 |
-53:10:11.3 |
HIP 70207 |
4.86 |
| 2026-06-09 12:00 |
14:21:29.81 |
-53:09:53.3 |
HIP 70207 |
4.86 |
| 2026-06-10 00:00 |
14:21:27.37 |
-53:09:35.2 |
HIP 70207 |
4.90 |
| 2026-06-10 12:00 |
14:21:24.95 |
-53:09:17.1 |
HIP 70207 |
4.98 |
| 2026-06-11 00:00 |
14:21:22.56 |
-53:08:58.9 |
HIP 70207 |
5.10 |
| 2026-06-11 12:00 |
14:21:20.18 |
-53:08:40.6 |
HIP 70207 |
5.26 |
| 2026-06-12 00:00 |
14:21:17.82 |
-53:08:22.2 |
HIP 70207 |
5.45 |
| 2026-06-12 12:00 |
14:21:15.48 |
-53:08:03.7 |
HIP 70207 |
5.67 |
| 2026-06-13 00:00 |
14:21:13.17 |
-53:07:45.2 |
HIP 70207 |
5.91 |
| 2026-06-13 12:00 |
14:21:10.87 |
-53:07:26.6 |
HIP 70207 |
6.18 |
| 2026-06-14 00:00 |
14:21:08.59 |
-53:07:07.9 |
HIP 70207 |
6.47 |
| 2026-06-14 12:00 |
14:21:06.33 |
-53:06:49.2 |
HIP 70207 |
6.77 |
| 2026-06-15 00:00 |
14:21:04.10 |
-53:06:30.4 |
HIP 70207 |
7.09 |
| 2026-06-15 12:00 |
14:21:01.88 |
-53:06:11.5 |
HIP 70207 |
7.42 |
| 2026-06-16 00:00 |
14:20:59.69 |
-53:05:52.5 |
HIP 70207 |
7.75 |
| 2026-06-16 12:00 |
14:20:57.51 |
-53:05:33.5 |
HIP 70207 |
8.10 |
| 2026-06-17 00:00 |
14:20:55.36 |
-53:05:14.4 |
HIP 70207 |
8.46 |
| 2026-06-17 12:00 |
14:20:53.23 |
-53:04:55.3 |
HIP 70207 |
8.82 |
| 2026-06-18 00:00 |
14:20:51.12 |
-53:04:36.1 |
HIP 70207 |
9.18 |
| 2026-06-18 12:00 |
14:20:49.04 |
-53:04:16.9 |
HIP 70207 |
9.55 |
| 2026-06-19 00:00 |
14:20:46.97 |
-53:03:57.5 |
HIP 70207 |
9.93 |
| 2026-06-19 12:00 |
14:20:44.93 |
-53:03:38.2 |
HIP 70207 |
10.30 |
| 2026-06-20 00:00 |
14:20:42.91 |
-53:03:18.8 |
HIP 70207 |
10.68 |
| 2026-06-20 12:00 |
14:20:40.91 |
-53:02:59.3 |
HIP 70207 |
11.06 |
| 2026-06-21 00:00 |
14:20:38.94 |
-53:02:39.8 |
HIP 70207 |
11.44 |
| 2026-06-21 12:00 |
14:20:36.98 |
-53:02:20.2 |
HIP 70207 |
11.83 |
| 2026-06-22 00:00 |
14:20:35.05 |
-53:02:00.6 |
HIP 70207 |
12.21 |