メタデータ

項目	値
Designation	415P/Tenagra
Type	P
Perihelion (tp_cal, UTC)	2021-02-16T03:55:08.005440Z
Orbit solution date (soln_date, UTC)	2025-04-09T14:05:50Z
Obs used	199
NEO	-
M1	7.400
K1	19.000
PC	-
Discovery observation (MPC, UTC)	2020-12-25T13:33:49.824000Z
Discovery magnitude (MPC)	21.10 w
Discovery observatory (MPC)	F52 · Pan-STARRS 2, Haleakala

オスキュレーティング軌道要素

項目	値
Epoch (epoch_cal, TDB)	2018-11-04.0000000
e	0.19516380
q (au)	3.311953
a (au)	4.115065
i (deg)	31.789340
Ω (om, deg)	160.325572
ω (w, deg)	346.450161
M (ma, deg)	261.392377

等級

散乱 + 全体線形

$$ M_a = (10.504 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$

モデル定数

項目	値
H0	10.504
n	6.000
gf	0.997
gb	-0.732
k	0.964
δ90	10.000

パラメータ	記号	範囲	説明
太陽・地球距離が1 AUのときの絶対等級	H0	-5 to 20	彗星の固有の明るさ
測光スロープパラメータ	n	2 to 6	太陽距離に対する明るさ変化率
前方散乱非対称係数	gf	0.8 to 1	前方散乱の強さ
後方散乱非対称係数	gb	-1 to -0.5	後方散乱の強さ
分配係数	k	0.8 to 1	前方/後方散乱の寄与比
ダスト/ガス明るさ比	δ90	1 to 10	ダスト散乱とガス放射の相対寄与

参考: EPSC-DPS2025-160

天体暦

Date/Time (UTC)	RA (J2000)	Dec (J2000)	Nearest HIP	Dist from HIP (arcmin)
2026-06-01 00:00	00:47:34.90	-05:27:05.3	HIP 3757	21.24
2026-06-01 12:00	00:47:56.33	-05:26:58.4	HIP 3757	19.33
2026-06-02 00:00	00:48:17.66	-05:26:52.7	HIP 3757	18.80
2026-06-02 12:00	00:48:38.91	-05:26:48.2	HIP 3757	19.76
2026-06-03 00:00	00:49:00.06	-05:26:44.8	HIP 3757	21.98
2026-06-03 12:00	00:49:21.13	-05:26:42.5	HIP 3935	19.23
2026-06-04 00:00	00:49:42.10	-05:26:41.5	HIP 3935	14.61
2026-06-04 12:00	00:50:02.98	-05:26:41.6	HIP 3935	10.60
2026-06-05 00:00	00:50:23.76	-05:26:42.9	HIP 3935	8.11
2026-06-05 12:00	00:50:44.45	-05:26:45.4	HIP 3935	8.53
2026-06-06 00:00	00:51:05.05	-05:26:49.0	HIP 3935	11.52
2026-06-06 12:00	00:51:25.55	-05:26:53.9	HIP 3935	15.65
2026-06-07 00:00	00:51:45.95	-05:27:00.0	HIP 3982	18.02
2026-06-07 12:00	00:52:06.25	-05:27:07.3	HIP 4156	17.99
2026-06-08 00:00	00:52:26.46	-05:27:15.9	HIP 4156	14.01
2026-06-08 12:00	00:52:46.57	-05:27:25.7	HIP 4156	10.91
2026-06-09 00:00	00:53:06.57	-05:27:36.7	HIP 4156	9.58
2026-06-09 12:00	00:53:26.48	-05:27:48.9	HIP 4156	10.65
2026-06-10 00:00	00:53:46.28	-05:28:02.5	HIP 4156	13.54
2026-06-10 12:00	00:54:05.98	-05:28:17.3	HIP 4308	16.39
2026-06-11 00:00	00:54:25.58	-05:28:33.3	HIP 4308	11.63
2026-06-11 12:00	00:54:45.07	-05:28:50.6	HIP 4308	7.07
2026-06-12 00:00	00:55:04.45	-05:29:09.3	HIP 4308	3.48
2026-06-12 12:00	00:55:23.73	-05:29:29.2	HIP 4308	4.58
2026-06-13 00:00	00:55:42.90	-05:29:50.4	HIP 4372	5.10
2026-06-13 12:00	00:56:01.96	-05:30:12.9	HIP 4372	2.47
2026-06-14 00:00	00:56:20.91	-05:30:36.8	HIP 4372	5.60
2026-06-14 12:00	00:56:39.75	-05:31:01.9	HIP 4372	10.05
2026-06-15 00:00	00:56:58.48	-05:31:28.4	HIP 4372	14.64
2026-06-15 12:00	00:57:17.09	-05:31:56.2	HIP 4372	19.25
2026-06-16 00:00	00:57:35.59	-05:32:25.4	HIP 4372	23.86
2026-06-16 12:00	00:57:53.98	-05:32:55.9	HIP 4592	23.81
2026-06-17 00:00	00:58:12.25	-05:33:27.7	HIP 4592	21.20
2026-06-17 12:00	00:58:30.40	-05:34:00.9	HIP 4592	19.32
2026-06-18 00:00	00:58:48.44	-05:34:35.5	HIP 4592	18.38
2026-06-18 12:00	00:59:06.36	-05:35:11.4	HIP 4592	18.49
2026-06-19 00:00	00:59:24.15	-05:35:48.7	HIP 4592	19.63
2026-06-19 12:00	00:59:41.83	-05:36:27.4	HIP 4592	21.61
2026-06-20 00:00	00:59:59.39	-05:37:07.4	HIP 4592	24.21
2026-06-20 12:00	01:00:16.83	-05:37:48.8	HIP 4777	24.77
2026-06-21 00:00	01:00:34.14	-05:38:31.7	HIP 4777	22.76
2026-06-21 12:00	01:00:51.34	-05:39:15.9	HIP 4777	21.50
2026-06-22 00:00	01:01:08.40	-05:40:01.5	HIP 4777	21.10